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tc.cpp

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    gmsh.jl 330.51 KiB
    # Gmsh - Copyright (C) 1997-2022 C. Geuzaine, J.-F. Remacle
    #
    # See the LICENSE.txt file in the Gmsh root directory for license information.
    # Please report all issues on https://gitlab.onelab.info/gmsh/gmsh/issues.
    
    # This file defines the Gmsh Julia API (v4.11.0).
    #
    # Do not edit this file directly: it is automatically generated by `api/gen.py'.
    #
    # By design, the Gmsh Julia API is purely functional, and only uses elementary
    # Julia types. See `tutorials/julia' and `examples/api' for tutorials and
    # examples.
    
    """
        module gmsh
    
    Top-level functions
    """
    module gmsh
    
    const GMSH_API_VERSION = "4.11.0"
    const GMSH_API_VERSION_MAJOR = 4
    const GMSH_API_VERSION_MINOR = 11
    const GMSH_API_VERSION_PATCH = 0
    const libdir = dirname(@__FILE__)
    const libname = Sys.iswindows() ? "gmsh-4.11.dll" : "libgmsh"
    import Libdl
    const lib = Libdl.find_library([libname], [libdir])
    
    """
        gmsh.initialize(argv = Vector{String}(), readConfigFiles = true, run = false)
    
    Initialize the Gmsh API. This must be called before any call to the other
    functions in the API. If `argc` and `argv` (or just `argv` in Python or Julia)
    are provided, they will be handled in the same way as the command line arguments
    in the Gmsh app. If `readConfigFiles` is set, read system Gmsh configuration
    files (gmshrc and gmsh-options). If `run` is set, run in the same way as the
    Gmsh app, either interactively or in batch mode depending on the command line
    arguments. If `run` is not set, initializing the API sets the options
    "General.AbortOnError" to 2 and "General.Terminal" to 1.
    
    Types:
     - `argv`: command line arguments
     - `readConfigFiles`: boolean
     - `run`: boolean
    """
    function initialize(argv = Vector{String}(), readConfigFiles = true, run = false)
        ierr = Ref{Cint}()
        ccall((:gmshInitialize, lib), Cvoid,
              (Cint, Ptr{Ptr{Cchar}}, Cint, Cint, Ptr{Cint}),
              length(argv), argv, readConfigFiles, run, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.isInitialized()
    
    Return 1 if the Gmsh API is initialized, and 0 if not.
    
    Return an integer.
    """
    function isInitialized()
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshIsInitialized, lib), Cint,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const is_initialized = isInitialized
    
    """
        gmsh.finalize()
    
    Finalize the Gmsh API. This must be called when you are done using the Gmsh API.
    """
    function finalize()
        ierr = Ref{Cint}()
        ccall((:gmshFinalize, lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.open(fileName)
    
    Open a file. Equivalent to the `File->Open` menu in the Gmsh app. Handling of
    the file depends on its extension and/or its contents: opening a file with model
    data will create a new model.
    
    Types:
     - `fileName`: string
    """
    function open(fileName)
        ierr = Ref{Cint}()
        ccall((:gmshOpen, lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}),
              fileName, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.merge(fileName)
    
    Merge a file. Equivalent to the `File->Merge` menu in the Gmsh app. Handling of
    the file depends on its extension and/or its contents. Merging a file with model
    data will add the data to the current model.
    
    Types:
     - `fileName`: string
    """
    function merge(fileName)
        ierr = Ref{Cint}()
        ccall((:gmshMerge, lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}),
              fileName, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.write(fileName)
    
    Write a file. The export format is determined by the file extension.
    
    Types:
     - `fileName`: string
    """
    function write(fileName)
        ierr = Ref{Cint}()
        ccall((:gmshWrite, lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}),
              fileName, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.clear()
    
    Clear all loaded models and post-processing data, and add a new empty model.
    """
    function clear()
        ierr = Ref{Cint}()
        ccall((:gmshClear, lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        module gmsh.option
    
    Option handling functions
    """
    module option
    
    import ..gmsh
    
    """
        gmsh.option.setNumber(name, value)
    
    Set a numerical option to `value`. `name` is of the form "Category.Option" or
    "Category[num].Option". Available categories and options are listed in the Gmsh
    reference manual.
    
    Types:
     - `name`: string
     - `value`: double
    """
    function setNumber(name, value)
        ierr = Ref{Cint}()
        ccall((:gmshOptionSetNumber, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Cdouble, Ptr{Cint}),
              name, value, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_number = setNumber
    
    """
        gmsh.option.getNumber(name)
    
    Get the `value` of a numerical option. `name` is of the form "Category.Option"
    or "Category[num].Option". Available categories and options are listed in the
    Gmsh reference manual.
    
    Return `value`.
    
    Types:
     - `name`: string
     - `value`: double
    """
    function getNumber(name)
        api_value_ = Ref{Cdouble}()
        ierr = Ref{Cint}()
        ccall((:gmshOptionGetNumber, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cdouble}, Ptr{Cint}),
              name, api_value_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_value_[]
    end
    const get_number = getNumber
    
    """
        gmsh.option.setString(name, value)
    
    Set a string option to `value`. `name` is of the form "Category.Option" or
    "Category[num].Option". Available categories and options are listed in the Gmsh
    reference manual.
    
    Types:
     - `name`: string
     - `value`: string
    """
    function setString(name, value)
        ierr = Ref{Cint}()
        ccall((:gmshOptionSetString, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cchar}, Ptr{Cint}),
              name, value, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_string = setString
    
    """
        gmsh.option.getString(name)
    
    Get the `value` of a string option. `name` is of the form "Category.Option" or
    "Category[num].Option". Available categories and options are listed in the Gmsh
    reference manual.
    
    Return `value`.
    
    Types:
     - `name`: string
     - `value`: string
    """
    function getString(name)
        api_value_ = Ref{Ptr{Cchar}}()
        ierr = Ref{Cint}()
        ccall((:gmshOptionGetString, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Ptr{Cchar}}, Ptr{Cint}),
              name, api_value_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        value = unsafe_string(api_value_[])
        return value
    end
    const get_string = getString
    
    """
        gmsh.option.setColor(name, r, g, b, a = 255)
    
    Set a color option to the RGBA value (`r`, `g`, `b`, `a`), where where `r`, `g`,
    `b` and `a` should be integers between 0 and 255. `name` is of the form
    "Category.Color.Option" or "Category[num].Color.Option". Available categories
    and options are listed in the Gmsh reference manual. For conciseness "Color."
    can be ommitted in `name`.
    
    Types:
     - `name`: string
     - `r`: integer
     - `g`: integer
     - `b`: integer
     - `a`: integer
    """
    function setColor(name, r, g, b, a = 255)
        ierr = Ref{Cint}()
        ccall((:gmshOptionSetColor, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Cint, Cint, Cint, Cint, Ptr{Cint}),
              name, r, g, b, a, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_color = setColor
    
    """
        gmsh.option.getColor(name)
    
    Get the `r`, `g`, `b`, `a` value of a color option. `name` is of the form
    "Category.Color.Option" or "Category[num].Color.Option". Available categories
    and options are listed in the Gmsh reference manual. For conciseness "Color."
    can be ommitted in `name`.
    
    Return `r`, `g`, `b`, `a`.
    
    Types:
     - `name`: string
     - `r`: integer
     - `g`: integer
     - `b`: integer
     - `a`: integer
    """
    function getColor(name)
        api_r_ = Ref{Cint}()
        api_g_ = Ref{Cint}()
        api_b_ = Ref{Cint}()
        api_a_ = Ref{Cint}()
        ierr = Ref{Cint}()
        ccall((:gmshOptionGetColor, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}, Ptr{Cint}, Ptr{Cint}, Ptr{Cint}, Ptr{Cint}),
              name, api_r_, api_g_, api_b_, api_a_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_r_[], api_g_[], api_b_[], api_a_[]
    end
    const get_color = getColor
    
    end # end of module option
    
    """
        module gmsh.model
    
    Model functions
    """
    module model
    
    import ..gmsh
    
    """
        gmsh.model.add(name)
    
    Add a new model, with name `name`, and set it as the current model.
    
    Types:
     - `name`: string
    """
    function add(name)
        ierr = Ref{Cint}()
        ccall((:gmshModelAdd, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}),
              name, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.remove()
    
    Remove the current model.
    """
    function remove()
        ierr = Ref{Cint}()
        ccall((:gmshModelRemove, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.list()
    
    List the names of all models.
    
    Return `names`.
    
    Types:
     - `names`: vector of strings
    """
    function list()
        api_names_ = Ref{Ptr{Ptr{Cchar}}}()
        api_names_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelList, gmsh.lib), Cvoid,
              (Ptr{Ptr{Ptr{Cchar}}}, Ptr{Csize_t}, Ptr{Cint}),
              api_names_, api_names_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_names_ = unsafe_wrap(Array, api_names_[], api_names_n_[], own = true)
        names = [unsafe_string(tmp_api_names_[i]) for i in 1:length(tmp_api_names_) ]
        return names
    end
    
    """
        gmsh.model.getCurrent()
    
    Get the name of the current model.
    
    Return `name`.
    
    Types:
     - `name`: string
    """
    function getCurrent()
        api_name_ = Ref{Ptr{Cchar}}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetCurrent, gmsh.lib), Cvoid,
              (Ptr{Ptr{Cchar}}, Ptr{Cint}),
              api_name_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        name = unsafe_string(api_name_[])
        return name
    end
    const get_current = getCurrent
    
    """
        gmsh.model.setCurrent(name)
    
    Set the current model to the model with name `name`. If several models have the
    same name, select the one that was added first.
    
    Types:
     - `name`: string
    """
    function setCurrent(name)
        ierr = Ref{Cint}()
        ccall((:gmshModelSetCurrent, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}),
              name, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_current = setCurrent
    
    """
        gmsh.model.getFileName()
    
    Get the file name (if any) associated with the current model. A file name is
    associated when a model is read from a file on disk.
    
    Return `fileName`.
    
    Types:
     - `fileName`: string
    """
    function getFileName()
        api_fileName_ = Ref{Ptr{Cchar}}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetFileName, gmsh.lib), Cvoid,
              (Ptr{Ptr{Cchar}}, Ptr{Cint}),
              api_fileName_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        fileName = unsafe_string(api_fileName_[])
        return fileName
    end
    const get_file_name = getFileName
    
    """
        gmsh.model.setFileName(fileName)
    
    Set the file name associated with the current model.
    
    Types:
     - `fileName`: string
    """
    function setFileName(fileName)
        ierr = Ref{Cint}()
        ccall((:gmshModelSetFileName, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}),
              fileName, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_file_name = setFileName
    
    """
        gmsh.model.getEntities(dim = -1)
    
    Get all the entities in the current model. If `dim` is >= 0, return only the
    entities of the specified dimension (e.g. points if `dim` == 0). The entities
    are returned as a vector of (dim, tag) pairs.
    
    Return `dimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `dim`: integer
    """
    function getEntities(dim = -1)
        api_dimTags_ = Ref{Ptr{Cint}}()
        api_dimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetEntities, gmsh.lib), Cvoid,
              (Ptr{Ptr{Cint}}, Ptr{Csize_t}, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, dim, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_dimTags_ = unsafe_wrap(Array, api_dimTags_[], api_dimTags_n_[], own = true)
        dimTags = [ (tmp_api_dimTags_[i], tmp_api_dimTags_[i+1]) for i in 1:2:length(tmp_api_dimTags_) ]
        return dimTags
    end
    const get_entities = getEntities
    
    """
        gmsh.model.setEntityName(dim, tag, name)
    
    Set the name of the entity of dimension `dim` and tag `tag`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `name`: string
    """
    function setEntityName(dim, tag, name)
        ierr = Ref{Cint}()
        ccall((:gmshModelSetEntityName, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cchar}, Ptr{Cint}),
              dim, tag, name, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_entity_name = setEntityName
    
    """
        gmsh.model.getEntityName(dim, tag)
    
    Get the name of the entity of dimension `dim` and tag `tag`.
    
    Return `name`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `name`: string
    """
    function getEntityName(dim, tag)
        api_name_ = Ref{Ptr{Cchar}}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetEntityName, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Cchar}}, Ptr{Cint}),
              dim, tag, api_name_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        name = unsafe_string(api_name_[])
        return name
    end
    const get_entity_name = getEntityName
    
    """
        gmsh.model.getPhysicalGroups(dim = -1)
    
    Get all the physical groups in the current model. If `dim` is >= 0, return only
    the entities of the specified dimension (e.g. physical points if `dim` == 0).
    The entities are returned as a vector of (dim, tag) pairs.
    
    Return `dimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `dim`: integer
    """
    function getPhysicalGroups(dim = -1)
        api_dimTags_ = Ref{Ptr{Cint}}()
        api_dimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetPhysicalGroups, gmsh.lib), Cvoid,
              (Ptr{Ptr{Cint}}, Ptr{Csize_t}, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, dim, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_dimTags_ = unsafe_wrap(Array, api_dimTags_[], api_dimTags_n_[], own = true)
        dimTags = [ (tmp_api_dimTags_[i], tmp_api_dimTags_[i+1]) for i in 1:2:length(tmp_api_dimTags_) ]
        return dimTags
    end
    const get_physical_groups = getPhysicalGroups
    
    """
        gmsh.model.getEntitiesForPhysicalGroup(dim, tag)
    
    Get the tags of the model entities making up the physical group of dimension
    `dim` and tag `tag`.
    
    Return `tags`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `tags`: vector of integers
    """
    function getEntitiesForPhysicalGroup(dim, tag)
        api_tags_ = Ref{Ptr{Cint}}()
        api_tags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetEntitiesForPhysicalGroup, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, tag, api_tags_, api_tags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tags = unsafe_wrap(Array, api_tags_[], api_tags_n_[], own = true)
        return tags
    end
    const get_entities_for_physical_group = getEntitiesForPhysicalGroup
    
    """
        gmsh.model.getPhysicalGroupsForEntity(dim, tag)
    
    Get the tags of the physical groups (if any) to which the model entity of
    dimension `dim` and tag `tag` belongs.
    
    Return `physicalTags`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `physicalTags`: vector of integers
    """
    function getPhysicalGroupsForEntity(dim, tag)
        api_physicalTags_ = Ref{Ptr{Cint}}()
        api_physicalTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetPhysicalGroupsForEntity, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, tag, api_physicalTags_, api_physicalTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        physicalTags = unsafe_wrap(Array, api_physicalTags_[], api_physicalTags_n_[], own = true)
        return physicalTags
    end
    const get_physical_groups_for_entity = getPhysicalGroupsForEntity
    
    """
        gmsh.model.addPhysicalGroup(dim, tags, tag = -1, name = "")
    
    Add a physical group of dimension `dim`, grouping the model entities with tags
    `tags`. Return the tag of the physical group, equal to `tag` if `tag` is
    positive, or a new tag if `tag` < 0. Set the name of the physical group if
    `name` is not empty.
    
    Return an integer.
    
    Types:
     - `dim`: integer
     - `tags`: vector of integers
     - `tag`: integer
     - `name`: string
    """
    function addPhysicalGroup(dim, tags, tag = -1, name = "")
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelAddPhysicalGroup, gmsh.lib), Cint,
              (Cint, Ptr{Cint}, Csize_t, Cint, Ptr{Cchar}, Ptr{Cint}),
              dim, convert(Vector{Cint}, tags), length(tags), tag, name, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_physical_group = addPhysicalGroup
    
    """
        gmsh.model.removePhysicalGroups(dimTags = Tuple{Cint,Cint}[])
    
    Remove the physical groups `dimTags` (given as a vector of (dim, tag) pairs)
    from the current model. If `dimTags` is empty, remove all groups.
    
    Types:
     - `dimTags`: vector of pairs of integers
    """
    function removePhysicalGroups(dimTags = Tuple{Cint,Cint}[])
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelRemovePhysicalGroups, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const remove_physical_groups = removePhysicalGroups
    
    """
        gmsh.model.setPhysicalName(dim, tag, name)
    
    Set the name of the physical group of dimension `dim` and tag `tag`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `name`: string
    """
    function setPhysicalName(dim, tag, name)
        ierr = Ref{Cint}()
        ccall((:gmshModelSetPhysicalName, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cchar}, Ptr{Cint}),
              dim, tag, name, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_physical_name = setPhysicalName
    
    """
        gmsh.model.removePhysicalName(name)
    
    Remove the physical name `name` from the current model.
    
    Types:
     - `name`: string
    """
    function removePhysicalName(name)
        ierr = Ref{Cint}()
        ccall((:gmshModelRemovePhysicalName, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}),
              name, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const remove_physical_name = removePhysicalName
    
    """
        gmsh.model.getPhysicalName(dim, tag)
    
    Get the name of the physical group of dimension `dim` and tag `tag`.
    
    Return `name`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `name`: string
    """
    function getPhysicalName(dim, tag)
        api_name_ = Ref{Ptr{Cchar}}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetPhysicalName, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Cchar}}, Ptr{Cint}),
              dim, tag, api_name_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        name = unsafe_string(api_name_[])
        return name
    end
    const get_physical_name = getPhysicalName
    
    """
        gmsh.model.setTag(dim, tag, newTag)
    
    Set the tag of the entity of dimension `dim` and tag `tag` to the new value
    `newTag`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `newTag`: integer
    """
    function setTag(dim, tag, newTag)
        ierr = Ref{Cint}()
        ccall((:gmshModelSetTag, gmsh.lib), Cvoid,
              (Cint, Cint, Cint, Ptr{Cint}),
              dim, tag, newTag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_tag = setTag
    
    """
        gmsh.model.getBoundary(dimTags, combined = true, oriented = true, recursive = false)
    
    Get the boundary of the model entities `dimTags`, given as a vector of (dim,
    tag) pairs. Return in `outDimTags` the boundary of the individual entities (if
    `combined` is false) or the boundary of the combined geometrical shape formed by
    all input entities (if `combined` is true). Return tags multiplied by the sign
    of the boundary entity if `oriented` is true. Apply the boundary operator
    recursively down to dimension 0 (i.e. to points) if `recursive` is true.
    
    Return `outDimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `outDimTags`: vector of pairs of integers
     - `combined`: boolean
     - `oriented`: boolean
     - `recursive`: boolean
    """
    function getBoundary(dimTags, combined = true, oriented = true, recursive = false)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetBoundary, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Cint, Cint, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, api_outDimTags_, api_outDimTags_n_, combined, oriented, recursive, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    const get_boundary = getBoundary
    
    """
        gmsh.model.getAdjacencies(dim, tag)
    
    Get the upward and downward adjacencies of the model entity of dimension `dim`
    and tag `tag`. The `upward` vector returns the tags of adjacent entities of
    dimension `dim` + 1; the `downward` vector returns the tags of adjacent entities
    of dimension `dim` - 1.
    
    Return `upward`, `downward`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `upward`: vector of integers
     - `downward`: vector of integers
    """
    function getAdjacencies(dim, tag)
        api_upward_ = Ref{Ptr{Cint}}()
        api_upward_n_ = Ref{Csize_t}()
        api_downward_ = Ref{Ptr{Cint}}()
        api_downward_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetAdjacencies, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, tag, api_upward_, api_upward_n_, api_downward_, api_downward_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        upward = unsafe_wrap(Array, api_upward_[], api_upward_n_[], own = true)
        downward = unsafe_wrap(Array, api_downward_[], api_downward_n_[], own = true)
        return upward, downward
    end
    const get_adjacencies = getAdjacencies
    
    """
        gmsh.model.getEntitiesInBoundingBox(xmin, ymin, zmin, xmax, ymax, zmax, dim = -1)
    
    Get the model entities in the bounding box defined by the two points (`xmin`,
    `ymin`, `zmin`) and (`xmax`, `ymax`, `zmax`). If `dim` is >= 0, return only the
    entities of the specified dimension (e.g. points if `dim` == 0).
    
    Return `dimTags`.
    
    Types:
     - `xmin`: double
     - `ymin`: double
     - `zmin`: double
     - `xmax`: double
     - `ymax`: double
     - `zmax`: double
     - `dimTags`: vector of pairs of integers
     - `dim`: integer
    """
    function getEntitiesInBoundingBox(xmin, ymin, zmin, xmax, ymax, zmax, dim = -1)
        api_dimTags_ = Ref{Ptr{Cint}}()
        api_dimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetEntitiesInBoundingBox, gmsh.lib), Cvoid,
              (Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Cint, Ptr{Cint}),
              xmin, ymin, zmin, xmax, ymax, zmax, api_dimTags_, api_dimTags_n_, dim, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_dimTags_ = unsafe_wrap(Array, api_dimTags_[], api_dimTags_n_[], own = true)
        dimTags = [ (tmp_api_dimTags_[i], tmp_api_dimTags_[i+1]) for i in 1:2:length(tmp_api_dimTags_) ]
        return dimTags
    end
    const get_entities_in_bounding_box = getEntitiesInBoundingBox
    
    """
        gmsh.model.getBoundingBox(dim, tag)
    
    Get the bounding box (`xmin`, `ymin`, `zmin`), (`xmax`, `ymax`, `zmax`) of the
    model entity of dimension `dim` and tag `tag`. If `dim` and `tag` are negative,
    get the bounding box of the whole model.
    
    Return `xmin`, `ymin`, `zmin`, `xmax`, `ymax`, `zmax`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `xmin`: double
     - `ymin`: double
     - `zmin`: double
     - `xmax`: double
     - `ymax`: double
     - `zmax`: double
    """
    function getBoundingBox(dim, tag)
        api_xmin_ = Ref{Cdouble}()
        api_ymin_ = Ref{Cdouble}()
        api_zmin_ = Ref{Cdouble}()
        api_xmax_ = Ref{Cdouble}()
        api_ymax_ = Ref{Cdouble}()
        api_zmax_ = Ref{Cdouble}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetBoundingBox, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cdouble}, Ptr{Cdouble}, Ptr{Cdouble}, Ptr{Cdouble}, Ptr{Cdouble}, Ptr{Cdouble}, Ptr{Cint}),
              dim, tag, api_xmin_, api_ymin_, api_zmin_, api_xmax_, api_ymax_, api_zmax_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_xmin_[], api_ymin_[], api_zmin_[], api_xmax_[], api_ymax_[], api_zmax_[]
    end
    const get_bounding_box = getBoundingBox
    
    """
        gmsh.model.getDimension()
    
    Return the geometrical dimension of the current model.
    
    Return an integer.
    """
    function getDimension()
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGetDimension, gmsh.lib), Cint,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const get_dimension = getDimension
    
    """
        gmsh.model.addDiscreteEntity(dim, tag = -1, boundary = Cint[])
    
    Add a discrete model entity (defined by a mesh) of dimension `dim` in the
    current model. Return the tag of the new discrete entity, equal to `tag` if
    `tag` is positive, or a new tag if `tag` < 0. `boundary` specifies the tags of
    the entities on the boundary of the discrete entity, if any. Specifying
    `boundary` allows Gmsh to construct the topology of the overall model.
    
    Return an integer.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `boundary`: vector of integers
    """
    function addDiscreteEntity(dim, tag = -1, boundary = Cint[])
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelAddDiscreteEntity, gmsh.lib), Cint,
              (Cint, Cint, Ptr{Cint}, Csize_t, Ptr{Cint}),
              dim, tag, convert(Vector{Cint}, boundary), length(boundary), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_discrete_entity = addDiscreteEntity
    
    """
        gmsh.model.removeEntities(dimTags, recursive = false)
    
    Remove the entities `dimTags` (given as a vector of (dim, tag) pairs) of the
    current model, provided that they are not on the boundary of (or embedded in)
    higher-dimensional entities. If `recursive` is true, remove all the entities on
    their boundaries, down to dimension 0.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `recursive`: boolean
    """
    function removeEntities(dimTags, recursive = false)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelRemoveEntities, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, recursive, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const remove_entities = removeEntities
    
    """
        gmsh.model.removeEntityName(name)
    
    Remove the entity name `name` from the current model.
    
    Types:
     - `name`: string
    """
    function removeEntityName(name)
        ierr = Ref{Cint}()
        ccall((:gmshModelRemoveEntityName, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}),
              name, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const remove_entity_name = removeEntityName
    
    """
        gmsh.model.getType(dim, tag)
    
    Get the type of the entity of dimension `dim` and tag `tag`.
    
    Return `entityType`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `entityType`: string
    """
    function getType(dim, tag)
        api_entityType_ = Ref{Ptr{Cchar}}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetType, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Cchar}}, Ptr{Cint}),
              dim, tag, api_entityType_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        entityType = unsafe_string(api_entityType_[])
        return entityType
    end
    const get_type = getType
    
    """
        gmsh.model.getParent(dim, tag)
    
    In a partitioned model, get the parent of the entity of dimension `dim` and tag
    `tag`, i.e. from which the entity is a part of, if any. `parentDim` and
    `parentTag` are set to -1 if the entity has no parent.
    
    Return `parentDim`, `parentTag`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `parentDim`: integer
     - `parentTag`: integer
    """
    function getParent(dim, tag)
        api_parentDim_ = Ref{Cint}()
        api_parentTag_ = Ref{Cint}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetParent, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cint}, Ptr{Cint}, Ptr{Cint}),
              dim, tag, api_parentDim_, api_parentTag_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_parentDim_[], api_parentTag_[]
    end
    const get_parent = getParent
    
    """
        gmsh.model.getNumberOfPartitions()
    
    Return the number of partitions in the model.
    
    Return an integer.
    """
    function getNumberOfPartitions()
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGetNumberOfPartitions, gmsh.lib), Cint,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const get_number_of_partitions = getNumberOfPartitions
    
    """
        gmsh.model.getPartitions(dim, tag)
    
    In a partitioned model, return the tags of the partition(s) to which the entity
    belongs.
    
    Return `partitions`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `partitions`: vector of integers
    """
    function getPartitions(dim, tag)
        api_partitions_ = Ref{Ptr{Cint}}()
        api_partitions_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetPartitions, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, tag, api_partitions_, api_partitions_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        partitions = unsafe_wrap(Array, api_partitions_[], api_partitions_n_[], own = true)
        return partitions
    end
    const get_partitions = getPartitions
    
    """
        gmsh.model.getValue(dim, tag, parametricCoord)
    
    Evaluate the parametrization of the entity of dimension `dim` and tag `tag` at
    the parametric coordinates `parametricCoord`. Only valid for `dim` equal to 0
    (with empty `parametricCoord`), 1 (with `parametricCoord` containing parametric
    coordinates on the curve) or 2 (with `parametricCoord` containing u, v
    parametric coordinates on the surface, concatenated: [p1u, p1v, p2u, ...]).
    Return x, y, z coordinates in `coord`, concatenated: [p1x, p1y, p1z, p2x, ...].
    
    Return `coord`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `parametricCoord`: vector of doubles
     - `coord`: vector of doubles
    """
    function getValue(dim, tag, parametricCoord)
        api_coord_ = Ref{Ptr{Cdouble}}()
        api_coord_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetValue, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cdouble}, Csize_t, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, tag, convert(Vector{Cdouble}, parametricCoord), length(parametricCoord), api_coord_, api_coord_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        coord = unsafe_wrap(Array, api_coord_[], api_coord_n_[], own = true)
        return coord
    end
    const get_value = getValue
    
    """
        gmsh.model.getDerivative(dim, tag, parametricCoord)
    
    Evaluate the derivative of the parametrization of the entity of dimension `dim`
    and tag `tag` at the parametric coordinates `parametricCoord`. Only valid for
    `dim` equal to 1 (with `parametricCoord` containing parametric coordinates on
    the curve) or 2 (with `parametricCoord` containing u, v parametric coordinates
    on the surface, concatenated: [p1u, p1v, p2u, ...]). For `dim` equal to 1 return
    the x, y, z components of the derivative with respect to u [d1ux, d1uy, d1uz,
    d2ux, ...]; for `dim` equal to 2 return the x, y, z components of the derivative
    with respect to u and v: [d1ux, d1uy, d1uz, d1vx, d1vy, d1vz, d2ux, ...].
    
    Return `derivatives`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `parametricCoord`: vector of doubles
     - `derivatives`: vector of doubles
    """
    function getDerivative(dim, tag, parametricCoord)
        api_derivatives_ = Ref{Ptr{Cdouble}}()
        api_derivatives_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetDerivative, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cdouble}, Csize_t, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, tag, convert(Vector{Cdouble}, parametricCoord), length(parametricCoord), api_derivatives_, api_derivatives_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        derivatives = unsafe_wrap(Array, api_derivatives_[], api_derivatives_n_[], own = true)
        return derivatives
    end
    const get_derivative = getDerivative
    
    """
        gmsh.model.getSecondDerivative(dim, tag, parametricCoord)
    
    Evaluate the second derivative of the parametrization of the entity of dimension
    `dim` and tag `tag` at the parametric coordinates `parametricCoord`. Only valid
    for `dim` equal to 1 (with `parametricCoord` containing parametric coordinates
    on the curve) or 2 (with `parametricCoord` containing u, v parametric
    coordinates on the surface, concatenated: [p1u, p1v, p2u, ...]). For `dim` equal
    to 1 return the x, y, z components of the second derivative with respect to u
    [d1uux, d1uuy, d1uuz, d2uux, ...]; for `dim` equal to 2 return the x, y, z
    components of the second derivative with respect to u and v, and the mixed
    derivative with respect to u and v: [d1uux, d1uuy, d1uuz, d1vvx, d1vvy, d1vvz,
    d1uvx, d1uvy, d1uvz, d2uux, ...].
    
    Return `derivatives`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `parametricCoord`: vector of doubles
     - `derivatives`: vector of doubles
    """
    function getSecondDerivative(dim, tag, parametricCoord)
        api_derivatives_ = Ref{Ptr{Cdouble}}()
        api_derivatives_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetSecondDerivative, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cdouble}, Csize_t, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, tag, convert(Vector{Cdouble}, parametricCoord), length(parametricCoord), api_derivatives_, api_derivatives_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        derivatives = unsafe_wrap(Array, api_derivatives_[], api_derivatives_n_[], own = true)
        return derivatives
    end
    const get_second_derivative = getSecondDerivative
    
    """
        gmsh.model.getCurvature(dim, tag, parametricCoord)
    
    Evaluate the (maximum) curvature of the entity of dimension `dim` and tag `tag`
    at the parametric coordinates `parametricCoord`. Only valid for `dim` equal to 1
    (with `parametricCoord` containing parametric coordinates on the curve) or 2
    (with `parametricCoord` containing u, v parametric coordinates on the surface,
    concatenated: [p1u, p1v, p2u, ...]).
    
    Return `curvatures`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `parametricCoord`: vector of doubles
     - `curvatures`: vector of doubles
    """
    function getCurvature(dim, tag, parametricCoord)
        api_curvatures_ = Ref{Ptr{Cdouble}}()
        api_curvatures_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetCurvature, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cdouble}, Csize_t, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, tag, convert(Vector{Cdouble}, parametricCoord), length(parametricCoord), api_curvatures_, api_curvatures_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        curvatures = unsafe_wrap(Array, api_curvatures_[], api_curvatures_n_[], own = true)
        return curvatures
    end
    const get_curvature = getCurvature
    
    """
        gmsh.model.getPrincipalCurvatures(tag, parametricCoord)
    
    Evaluate the principal curvatures of the surface with tag `tag` at the
    parametric coordinates `parametricCoord`, as well as their respective
    directions. `parametricCoord` are given by pair of u and v coordinates,
    concatenated: [p1u, p1v, p2u, ...].
    
    Return `curvatureMax`, `curvatureMin`, `directionMax`, `directionMin`.
    
    Types:
     - `tag`: integer
     - `parametricCoord`: vector of doubles
     - `curvatureMax`: vector of doubles
     - `curvatureMin`: vector of doubles
     - `directionMax`: vector of doubles
     - `directionMin`: vector of doubles
    """
    function getPrincipalCurvatures(tag, parametricCoord)
        api_curvatureMax_ = Ref{Ptr{Cdouble}}()
        api_curvatureMax_n_ = Ref{Csize_t}()
        api_curvatureMin_ = Ref{Ptr{Cdouble}}()
        api_curvatureMin_n_ = Ref{Csize_t}()
        api_directionMax_ = Ref{Ptr{Cdouble}}()
        api_directionMax_n_ = Ref{Csize_t}()
        api_directionMin_ = Ref{Ptr{Cdouble}}()
        api_directionMin_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetPrincipalCurvatures, gmsh.lib), Cvoid,
              (Cint, Ptr{Cdouble}, Csize_t, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              tag, convert(Vector{Cdouble}, parametricCoord), length(parametricCoord), api_curvatureMax_, api_curvatureMax_n_, api_curvatureMin_, api_curvatureMin_n_, api_directionMax_, api_directionMax_n_, api_directionMin_, api_directionMin_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        curvatureMax = unsafe_wrap(Array, api_curvatureMax_[], api_curvatureMax_n_[], own = true)
        curvatureMin = unsafe_wrap(Array, api_curvatureMin_[], api_curvatureMin_n_[], own = true)
        directionMax = unsafe_wrap(Array, api_directionMax_[], api_directionMax_n_[], own = true)
        directionMin = unsafe_wrap(Array, api_directionMin_[], api_directionMin_n_[], own = true)
        return curvatureMax, curvatureMin, directionMax, directionMin
    end
    const get_principal_curvatures = getPrincipalCurvatures
    
    """
        gmsh.model.getNormal(tag, parametricCoord)
    
    Get the normal to the surface with tag `tag` at the parametric coordinates
    `parametricCoord`. The `parametricCoord` vector should contain u and v
    coordinates, concatenated: [p1u, p1v, p2u, ...]. `normals` are returned as a
    vector of x, y, z components, concatenated: [n1x, n1y, n1z, n2x, ...].
    
    Return `normals`.
    
    Types:
     - `tag`: integer
     - `parametricCoord`: vector of doubles
     - `normals`: vector of doubles
    """
    function getNormal(tag, parametricCoord)
        api_normals_ = Ref{Ptr{Cdouble}}()
        api_normals_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetNormal, gmsh.lib), Cvoid,
              (Cint, Ptr{Cdouble}, Csize_t, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              tag, convert(Vector{Cdouble}, parametricCoord), length(parametricCoord), api_normals_, api_normals_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        normals = unsafe_wrap(Array, api_normals_[], api_normals_n_[], own = true)
        return normals
    end
    const get_normal = getNormal
    
    """
        gmsh.model.getParametrization(dim, tag, coord)
    
    Get the parametric coordinates `parametricCoord` for the points `coord` on the
    entity of dimension `dim` and tag `tag`. `coord` are given as x, y, z
    coordinates, concatenated: [p1x, p1y, p1z, p2x, ...]. `parametricCoord` returns
    the parametric coordinates t on the curve (if `dim` = 1) or u and v coordinates
    concatenated on the surface (if `dim` = 2), i.e. [p1t, p2t, ...] or [p1u, p1v,
    p2u, ...].
    
    Return `parametricCoord`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `coord`: vector of doubles
     - `parametricCoord`: vector of doubles
    """
    function getParametrization(dim, tag, coord)
        api_parametricCoord_ = Ref{Ptr{Cdouble}}()
        api_parametricCoord_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetParametrization, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cdouble}, Csize_t, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, tag, convert(Vector{Cdouble}, coord), length(coord), api_parametricCoord_, api_parametricCoord_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        parametricCoord = unsafe_wrap(Array, api_parametricCoord_[], api_parametricCoord_n_[], own = true)
        return parametricCoord
    end
    const get_parametrization = getParametrization
    
    """
        gmsh.model.getParametrizationBounds(dim, tag)
    
    Get the `min` and `max` bounds of the parametric coordinates for the entity of
    dimension `dim` and tag `tag`.
    
    Return `min`, `max`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `min`: vector of doubles
     - `max`: vector of doubles
    """
    function getParametrizationBounds(dim, tag)
        api_min_ = Ref{Ptr{Cdouble}}()
        api_min_n_ = Ref{Csize_t}()
        api_max_ = Ref{Ptr{Cdouble}}()
        api_max_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetParametrizationBounds, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, tag, api_min_, api_min_n_, api_max_, api_max_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        min = unsafe_wrap(Array, api_min_[], api_min_n_[], own = true)
        max = unsafe_wrap(Array, api_max_[], api_max_n_[], own = true)
        return min, max
    end
    const get_parametrization_bounds = getParametrizationBounds
    
    """
        gmsh.model.isInside(dim, tag, coord, parametric = false)
    
    Check if the coordinates (or the parametric coordinates if `parametric` is set)
    provided in `coord` correspond to points inside the entity of dimension `dim`
    and tag `tag`, and return the number of points inside. This feature is only
    available for a subset of entities, depending on the underlying geometrical
    representation.
    
    Return an integer.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `coord`: vector of doubles
     - `parametric`: boolean
    """
    function isInside(dim, tag, coord, parametric = false)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelIsInside, gmsh.lib), Cint,
              (Cint, Cint, Ptr{Cdouble}, Csize_t, Cint, Ptr{Cint}),
              dim, tag, convert(Vector{Cdouble}, coord), length(coord), parametric, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const is_inside = isInside
    
    """
        gmsh.model.getClosestPoint(dim, tag, coord)
    
    Get the points `closestCoord` on the entity of dimension `dim` and tag `tag` to
    the points `coord`, by orthogonal projection. `coord` and `closestCoord` are
    given as x, y, z coordinates, concatenated: [p1x, p1y, p1z, p2x, ...].
    `parametricCoord` returns the parametric coordinates t on the curve (if `dim` =
    1) or u and v coordinates concatenated on the surface (if `dim` = 2), i.e. [p1t,
    p2t, ...] or [p1u, p1v, p2u, ...].
    
    Return `closestCoord`, `parametricCoord`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `coord`: vector of doubles
     - `closestCoord`: vector of doubles
     - `parametricCoord`: vector of doubles
    """
    function getClosestPoint(dim, tag, coord)
        api_closestCoord_ = Ref{Ptr{Cdouble}}()
        api_closestCoord_n_ = Ref{Csize_t}()
        api_parametricCoord_ = Ref{Ptr{Cdouble}}()
        api_parametricCoord_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetClosestPoint, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cdouble}, Csize_t, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, tag, convert(Vector{Cdouble}, coord), length(coord), api_closestCoord_, api_closestCoord_n_, api_parametricCoord_, api_parametricCoord_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        closestCoord = unsafe_wrap(Array, api_closestCoord_[], api_closestCoord_n_[], own = true)
        parametricCoord = unsafe_wrap(Array, api_parametricCoord_[], api_parametricCoord_n_[], own = true)
        return closestCoord, parametricCoord
    end
    const get_closest_point = getClosestPoint
    
    """
        gmsh.model.reparametrizeOnSurface(dim, tag, parametricCoord, surfaceTag, which = 0)
    
    Reparametrize the boundary entity (point or curve, i.e. with `dim` == 0 or `dim`
    == 1) of tag `tag` on the surface `surfaceTag`. If `dim` == 1, reparametrize all
    the points corresponding to the parametric coordinates `parametricCoord`.
    Multiple matches in case of periodic surfaces can be selected with `which`. This
    feature is only available for a subset of entities, depending on the underlying
    geometrical representation.
    
    Return `surfaceParametricCoord`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `parametricCoord`: vector of doubles
     - `surfaceTag`: integer
     - `surfaceParametricCoord`: vector of doubles
     - `which`: integer
    """
    function reparametrizeOnSurface(dim, tag, parametricCoord, surfaceTag, which = 0)
        api_surfaceParametricCoord_ = Ref{Ptr{Cdouble}}()
        api_surfaceParametricCoord_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelReparametrizeOnSurface, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cdouble}, Csize_t, Cint, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Cint, Ptr{Cint}),
              dim, tag, convert(Vector{Cdouble}, parametricCoord), length(parametricCoord), surfaceTag, api_surfaceParametricCoord_, api_surfaceParametricCoord_n_, which, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        surfaceParametricCoord = unsafe_wrap(Array, api_surfaceParametricCoord_[], api_surfaceParametricCoord_n_[], own = true)
        return surfaceParametricCoord
    end
    const reparametrize_on_surface = reparametrizeOnSurface
    
    """
        gmsh.model.setVisibility(dimTags, value, recursive = false)
    
    Set the visibility of the model entities `dimTags` (given as a vector of (dim,
    tag) pairs) to `value`. Apply the visibility setting recursively if `recursive`
    is true.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `value`: integer
     - `recursive`: boolean
    """
    function setVisibility(dimTags, value, recursive = false)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelSetVisibility, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cint, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, value, recursive, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_visibility = setVisibility
    
    """
        gmsh.model.getVisibility(dim, tag)
    
    Get the visibility of the model entity of dimension `dim` and tag `tag`.
    
    Return `value`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `value`: integer
    """
    function getVisibility(dim, tag)
        api_value_ = Ref{Cint}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetVisibility, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cint}, Ptr{Cint}),
              dim, tag, api_value_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_value_[]
    end
    const get_visibility = getVisibility
    
    """
        gmsh.model.setVisibilityPerWindow(value, windowIndex = 0)
    
    Set the global visibility of the model per window to `value`, where
    `windowIndex` identifies the window in the window list.
    
    Types:
     - `value`: integer
     - `windowIndex`: integer
    """
    function setVisibilityPerWindow(value, windowIndex = 0)
        ierr = Ref{Cint}()
        ccall((:gmshModelSetVisibilityPerWindow, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cint}),
              value, windowIndex, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_visibility_per_window = setVisibilityPerWindow
    
    """
        gmsh.model.setColor(dimTags, r, g, b, a = 255, recursive = false)
    
    Set the color of the model entities `dimTags` (given as a vector of (dim, tag)
    pairs) to the RGBA value (`r`, `g`, `b`, `a`), where `r`, `g`, `b` and `a`
    should be integers between 0 and 255. Apply the color setting recursively if
    `recursive` is true.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `r`: integer
     - `g`: integer
     - `b`: integer
     - `a`: integer
     - `recursive`: boolean
    """
    function setColor(dimTags, r, g, b, a = 255, recursive = false)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelSetColor, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cint, Cint, Cint, Cint, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, r, g, b, a, recursive, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_color = setColor
    
    """
        gmsh.model.getColor(dim, tag)
    
    Get the color of the model entity of dimension `dim` and tag `tag`.
    
    Return `r`, `g`, `b`, `a`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `r`: integer
     - `g`: integer
     - `b`: integer
     - `a`: integer
    """
    function getColor(dim, tag)
        api_r_ = Ref{Cint}()
        api_g_ = Ref{Cint}()
        api_b_ = Ref{Cint}()
        api_a_ = Ref{Cint}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetColor, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cint}, Ptr{Cint}, Ptr{Cint}, Ptr{Cint}, Ptr{Cint}),
              dim, tag, api_r_, api_g_, api_b_, api_a_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_r_[], api_g_[], api_b_[], api_a_[]
    end
    const get_color = getColor
    
    """
        gmsh.model.setCoordinates(tag, x, y, z)
    
    Set the `x`, `y`, `z` coordinates of a geometrical point.
    
    Types:
     - `tag`: integer
     - `x`: double
     - `y`: double
     - `z`: double
    """
    function setCoordinates(tag, x, y, z)
        ierr = Ref{Cint}()
        ccall((:gmshModelSetCoordinates, gmsh.lib), Cvoid,
              (Cint, Cdouble, Cdouble, Cdouble, Ptr{Cint}),
              tag, x, y, z, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_coordinates = setCoordinates
    
    """
        gmsh.model.getAttributeNames()
    
    Get the names of any optional attributes stored in the model.
    
    Return `names`.
    
    Types:
     - `names`: vector of strings
    """
    function getAttributeNames()
        api_names_ = Ref{Ptr{Ptr{Cchar}}}()
        api_names_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetAttributeNames, gmsh.lib), Cvoid,
              (Ptr{Ptr{Ptr{Cchar}}}, Ptr{Csize_t}, Ptr{Cint}),
              api_names_, api_names_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_names_ = unsafe_wrap(Array, api_names_[], api_names_n_[], own = true)
        names = [unsafe_string(tmp_api_names_[i]) for i in 1:length(tmp_api_names_) ]
        return names
    end
    const get_attribute_names = getAttributeNames
    
    """
        gmsh.model.getAttribute(name)
    
    Get the values of the attribute with name `name`.
    
    Return `values`.
    
    Types:
     - `name`: string
     - `values`: vector of strings
    """
    function getAttribute(name)
        api_values_ = Ref{Ptr{Ptr{Cchar}}}()
        api_values_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGetAttribute, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Ptr{Ptr{Cchar}}}, Ptr{Csize_t}, Ptr{Cint}),
              name, api_values_, api_values_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_values_ = unsafe_wrap(Array, api_values_[], api_values_n_[], own = true)
        values = [unsafe_string(tmp_api_values_[i]) for i in 1:length(tmp_api_values_) ]
        return values
    end
    const get_attribute = getAttribute
    
    """
        gmsh.model.setAttribute(name, values)
    
    Set the values of the attribute with name `name`.
    
    Types:
     - `name`: string
     - `values`: vector of strings
    """
    function setAttribute(name, values)
        ierr = Ref{Cint}()
        ccall((:gmshModelSetAttribute, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Ptr{Cchar}}, Csize_t, Ptr{Cint}),
              name, values, length(values), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_attribute = setAttribute
    
    """
        gmsh.model.removeAttribute(name)
    
    Remove the attribute with name `name`.
    
    Types:
     - `name`: string
    """
    function removeAttribute(name)
        ierr = Ref{Cint}()
        ccall((:gmshModelRemoveAttribute, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}),
              name, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const remove_attribute = removeAttribute
    
    """
        module gmsh.model.mesh
    
    Mesh functions
    """
    module mesh
    
    import ...gmsh
    
    """
        gmsh.model.mesh.generate(dim = 3)
    
    Generate a mesh of the current model, up to dimension `dim` (0, 1, 2 or 3).
    
    Types:
     - `dim`: integer
    """
    function generate(dim = 3)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGenerate, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}),
              dim, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.mesh.partition(numPart, elementTags = Csize_t[], partitions = Cint[])
    
    Partition the mesh of the current model into `numPart` partitions. Optionally,
    `elementTags` and `partitions` can be provided to specify the partition of each
    element explicitly.
    
    Types:
     - `numPart`: integer
     - `elementTags`: vector of sizes
     - `partitions`: vector of integers
    """
    function partition(numPart, elementTags = Csize_t[], partitions = Cint[])
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshPartition, gmsh.lib), Cvoid,
              (Cint, Ptr{Csize_t}, Csize_t, Ptr{Cint}, Csize_t, Ptr{Cint}),
              numPart, convert(Vector{Csize_t}, elementTags), length(elementTags), convert(Vector{Cint}, partitions), length(partitions), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.mesh.unpartition()
    
    Unpartition the mesh of the current model.
    """
    function unpartition()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshUnpartition, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.mesh.optimize(method = "", force = false, niter = 1, dimTags = Tuple{Cint,Cint}[])
    
    Optimize the mesh of the current model using `method` (empty for default
    tetrahedral mesh optimizer, "Netgen" for Netgen optimizer, "HighOrder" for
    direct high-order mesh optimizer, "HighOrderElastic" for high-order elastic
    smoother, "HighOrderFastCurving" for fast curving algorithm, "Laplace2D" for
    Laplace smoothing, "Relocate2D" and "Relocate3D" for node relocation,
    "QuadQuasiStructured" for quad mesh optimization, "UntangleMeshGeometry" for
    untangling). If `force` is set apply the optimization also to discrete entities.
    If `dimTags` (given as a vector of (dim, tag) pairs) is given, only apply the
    optimizer to the given entities.
    
    Types:
     - `method`: string
     - `force`: boolean
     - `niter`: integer
     - `dimTags`: vector of pairs of integers
    """
    function optimize(method = "", force = false, niter = 1, dimTags = Tuple{Cint,Cint}[])
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshOptimize, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Cint, Cint, Ptr{Cint}, Csize_t, Ptr{Cint}),
              method, force, niter, api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.mesh.recombine()
    
    Recombine the mesh of the current model.
    """
    function recombine()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshRecombine, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.mesh.refine()
    
    Refine the mesh of the current model by uniformly splitting the elements.
    """
    function refine()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshRefine, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.mesh.setOrder(order)
    
    Set the order of the elements in the mesh of the current model to `order`.
    
    Types:
     - `order`: integer
    """
    function setOrder(order)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetOrder, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}),
              order, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_order = setOrder
    
    """
        gmsh.model.mesh.getLastEntityError()
    
    Get the last entities `dimTags` (as a vector of (dim, tag) pairs) where a
    meshing error occurred. Currently only populated by the new 3D meshing
    algorithms.
    
    Return `dimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
    """
    function getLastEntityError()
        api_dimTags_ = Ref{Ptr{Cint}}()
        api_dimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetLastEntityError, gmsh.lib), Cvoid,
              (Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_dimTags_ = unsafe_wrap(Array, api_dimTags_[], api_dimTags_n_[], own = true)
        dimTags = [ (tmp_api_dimTags_[i], tmp_api_dimTags_[i+1]) for i in 1:2:length(tmp_api_dimTags_) ]
        return dimTags
    end
    const get_last_entity_error = getLastEntityError
    
    """
        gmsh.model.mesh.getLastNodeError()
    
    Get the last node tags `nodeTags` where a meshing error occurred. Currently only
    populated by the new 3D meshing algorithms.
    
    Return `nodeTags`.
    
    Types:
     - `nodeTags`: vector of sizes
    """
    function getLastNodeError()
        api_nodeTags_ = Ref{Ptr{Csize_t}}()
        api_nodeTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetLastNodeError, gmsh.lib), Cvoid,
              (Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Cint}),
              api_nodeTags_, api_nodeTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        nodeTags = unsafe_wrap(Array, api_nodeTags_[], api_nodeTags_n_[], own = true)
        return nodeTags
    end
    const get_last_node_error = getLastNodeError
    
    """
        gmsh.model.mesh.clear(dimTags = Tuple{Cint,Cint}[])
    
    Clear the mesh, i.e. delete all the nodes and elements, for the entities
    `dimTags`, given as a vector of (dim, tag) pairs. If `dimTags` is empty, clear
    the whole mesh. Note that the mesh of an entity can only be cleared if this
    entity is not on the boundary of another entity with a non-empty mesh.
    
    Types:
     - `dimTags`: vector of pairs of integers
    """
    function clear(dimTags = Tuple{Cint,Cint}[])
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshClear, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.mesh.reverse(dimTags = Tuple{Cint,Cint}[])
    
    Reverse the orientation of the elements in the entities `dimTags`, given as a
    vector of (dim, tag) pairs. If `dimTags` is empty, reverse the orientation of
    the elements in the whole mesh.
    
    Types:
     - `dimTags`: vector of pairs of integers
    """
    function reverse(dimTags = Tuple{Cint,Cint}[])
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshReverse, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.mesh.affineTransform(affineTransform, dimTags = Tuple{Cint,Cint}[])
    
    Apply the affine transformation `affineTransform` (16 entries of a 4x4 matrix,
    by row; only the 12 first can be provided for convenience) to the coordinates of
    the nodes classified on the entities `dimTags`, given as a vector of (dim, tag)
    pairs. If `dimTags` is empty, transform all the nodes in the mesh.
    
    Types:
     - `affineTransform`: vector of doubles
     - `dimTags`: vector of pairs of integers
    """
    function affineTransform(affineTransform, dimTags = Tuple{Cint,Cint}[])
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshAffineTransform, gmsh.lib), Cvoid,
              (Ptr{Cdouble}, Csize_t, Ptr{Cint}, Csize_t, Ptr{Cint}),
              convert(Vector{Cdouble}, affineTransform), length(affineTransform), api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const affine_transform = affineTransform
    
    """
        gmsh.model.mesh.getNodes(dim = -1, tag = -1, includeBoundary = false, returnParametricCoord = true)
    
    Get the nodes classified on the entity of dimension `dim` and tag `tag`. If
    `tag` < 0, get the nodes for all entities of dimension `dim`. If `dim` and `tag`
    are negative, get all the nodes in the mesh. `nodeTags` contains the node tags
    (their unique, strictly positive identification numbers). `coord` is a vector of
    length 3 times the length of `nodeTags` that contains the x, y, z coordinates of
    the nodes, concatenated: [n1x, n1y, n1z, n2x, ...]. If `dim` >= 0 and
    `returnParamtricCoord` is set, `parametricCoord` contains the parametric
    coordinates ([u1, u2, ...] or [u1, v1, u2, ...]) of the nodes, if available. The
    length of `parametricCoord` can be 0 or `dim` times the length of `nodeTags`. If
    `includeBoundary` is set, also return the nodes classified on the boundary of
    the entity (which will be reparametrized on the entity if `dim` >= 0 in order to
    compute their parametric coordinates).
    
    Return `nodeTags`, `coord`, `parametricCoord`.
    
    Types:
     - `nodeTags`: vector of sizes
     - `coord`: vector of doubles
     - `parametricCoord`: vector of doubles
     - `dim`: integer
     - `tag`: integer
     - `includeBoundary`: boolean
     - `returnParametricCoord`: boolean
    """
    function getNodes(dim = -1, tag = -1, includeBoundary = false, returnParametricCoord = true)
        api_nodeTags_ = Ref{Ptr{Csize_t}}()
        api_nodeTags_n_ = Ref{Csize_t}()
        api_coord_ = Ref{Ptr{Cdouble}}()
        api_coord_n_ = Ref{Csize_t}()
        api_parametricCoord_ = Ref{Ptr{Cdouble}}()
        api_parametricCoord_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetNodes, gmsh.lib), Cvoid,
              (Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Cint, Cint, Cint, Cint, Ptr{Cint}),
              api_nodeTags_, api_nodeTags_n_, api_coord_, api_coord_n_, api_parametricCoord_, api_parametricCoord_n_, dim, tag, includeBoundary, returnParametricCoord, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        nodeTags = unsafe_wrap(Array, api_nodeTags_[], api_nodeTags_n_[], own = true)
        coord = unsafe_wrap(Array, api_coord_[], api_coord_n_[], own = true)
        parametricCoord = unsafe_wrap(Array, api_parametricCoord_[], api_parametricCoord_n_[], own = true)
        return nodeTags, coord, parametricCoord
    end
    const get_nodes = getNodes
    
    """
        gmsh.model.mesh.getNodesByElementType(elementType, tag = -1, returnParametricCoord = true)
    
    Get the nodes classified on the entity of tag `tag`, for all the elements of
    type `elementType`. The other arguments are treated as in `getNodes`.
    
    Return `nodeTags`, `coord`, `parametricCoord`.
    
    Types:
     - `elementType`: integer
     - `nodeTags`: vector of sizes
     - `coord`: vector of doubles
     - `parametricCoord`: vector of doubles
     - `tag`: integer
     - `returnParametricCoord`: boolean
    """
    function getNodesByElementType(elementType, tag = -1, returnParametricCoord = true)
        api_nodeTags_ = Ref{Ptr{Csize_t}}()
        api_nodeTags_n_ = Ref{Csize_t}()
        api_coord_ = Ref{Ptr{Cdouble}}()
        api_coord_n_ = Ref{Csize_t}()
        api_parametricCoord_ = Ref{Ptr{Cdouble}}()
        api_parametricCoord_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetNodesByElementType, gmsh.lib), Cvoid,
              (Cint, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Cint, Cint, Ptr{Cint}),
              elementType, api_nodeTags_, api_nodeTags_n_, api_coord_, api_coord_n_, api_parametricCoord_, api_parametricCoord_n_, tag, returnParametricCoord, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        nodeTags = unsafe_wrap(Array, api_nodeTags_[], api_nodeTags_n_[], own = true)
        coord = unsafe_wrap(Array, api_coord_[], api_coord_n_[], own = true)
        parametricCoord = unsafe_wrap(Array, api_parametricCoord_[], api_parametricCoord_n_[], own = true)
        return nodeTags, coord, parametricCoord
    end
    const get_nodes_by_element_type = getNodesByElementType
    
    """
        gmsh.model.mesh.getNode(nodeTag)
    
    Get the coordinates and the parametric coordinates (if any) of the node with tag
    `tag`, as well as the dimension `dim` and tag `tag` of the entity on which the
    node is classified. This function relies on an internal cache (a vector in case
    of dense node numbering, a map otherwise); for large meshes accessing nodes in
    bulk is often preferable.
    
    Return `coord`, `parametricCoord`, `dim`, `tag`.
    
    Types:
     - `nodeTag`: size
     - `coord`: vector of doubles
     - `parametricCoord`: vector of doubles
     - `dim`: integer
     - `tag`: integer
    """
    function getNode(nodeTag)
        api_coord_ = Ref{Ptr{Cdouble}}()
        api_coord_n_ = Ref{Csize_t}()
        api_parametricCoord_ = Ref{Ptr{Cdouble}}()
        api_parametricCoord_n_ = Ref{Csize_t}()
        api_dim_ = Ref{Cint}()
        api_tag_ = Ref{Cint}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetNode, gmsh.lib), Cvoid,
              (Csize_t, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}, Ptr{Cint}, Ptr{Cint}),
              nodeTag, api_coord_, api_coord_n_, api_parametricCoord_, api_parametricCoord_n_, api_dim_, api_tag_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        coord = unsafe_wrap(Array, api_coord_[], api_coord_n_[], own = true)
        parametricCoord = unsafe_wrap(Array, api_parametricCoord_[], api_parametricCoord_n_[], own = true)
        return coord, parametricCoord, api_dim_[], api_tag_[]
    end
    const get_node = getNode
    
    """
        gmsh.model.mesh.setNode(nodeTag, coord, parametricCoord)
    
    Set the coordinates and the parametric coordinates (if any) of the node with tag
    `tag`. This function relies on an internal cache (a vector in case of dense node
    numbering, a map otherwise); for large meshes accessing nodes in bulk is often
    preferable.
    
    Types:
     - `nodeTag`: size
     - `coord`: vector of doubles
     - `parametricCoord`: vector of doubles
    """
    function setNode(nodeTag, coord, parametricCoord)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetNode, gmsh.lib), Cvoid,
              (Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              nodeTag, convert(Vector{Cdouble}, coord), length(coord), convert(Vector{Cdouble}, parametricCoord), length(parametricCoord), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_node = setNode
    
    """
        gmsh.model.mesh.rebuildNodeCache(onlyIfNecessary = true)
    
    Rebuild the node cache.
    
    Types:
     - `onlyIfNecessary`: boolean
    """
    function rebuildNodeCache(onlyIfNecessary = true)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshRebuildNodeCache, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}),
              onlyIfNecessary, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const rebuild_node_cache = rebuildNodeCache
    
    """
        gmsh.model.mesh.rebuildElementCache(onlyIfNecessary = true)
    
    Rebuild the element cache.
    
    Types:
     - `onlyIfNecessary`: boolean
    """
    function rebuildElementCache(onlyIfNecessary = true)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshRebuildElementCache, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}),
              onlyIfNecessary, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const rebuild_element_cache = rebuildElementCache
    
    """
        gmsh.model.mesh.getNodesForPhysicalGroup(dim, tag)
    
    Get the nodes from all the elements belonging to the physical group of dimension
    `dim` and tag `tag`. `nodeTags` contains the node tags; `coord` is a vector of
    length 3 times the length of `nodeTags` that contains the x, y, z coordinates of
    the nodes, concatenated: [n1x, n1y, n1z, n2x, ...].
    
    Return `nodeTags`, `coord`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `nodeTags`: vector of sizes
     - `coord`: vector of doubles
    """
    function getNodesForPhysicalGroup(dim, tag)
        api_nodeTags_ = Ref{Ptr{Csize_t}}()
        api_nodeTags_n_ = Ref{Csize_t}()
        api_coord_ = Ref{Ptr{Cdouble}}()
        api_coord_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetNodesForPhysicalGroup, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, tag, api_nodeTags_, api_nodeTags_n_, api_coord_, api_coord_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        nodeTags = unsafe_wrap(Array, api_nodeTags_[], api_nodeTags_n_[], own = true)
        coord = unsafe_wrap(Array, api_coord_[], api_coord_n_[], own = true)
        return nodeTags, coord
    end
    const get_nodes_for_physical_group = getNodesForPhysicalGroup
    
    """
        gmsh.model.mesh.getMaxNodeTag()
    
    Get the maximum tag `maxTag` of a node in the mesh.
    
    Return `maxTag`.
    
    Types:
     - `maxTag`: size
    """
    function getMaxNodeTag()
        api_maxTag_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetMaxNodeTag, gmsh.lib), Cvoid,
              (Ptr{Csize_t}, Ptr{Cint}),
              api_maxTag_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_maxTag_[]
    end
    const get_max_node_tag = getMaxNodeTag
    
    """
        gmsh.model.mesh.addNodes(dim, tag, nodeTags, coord, parametricCoord = Cdouble[])
    
    Add nodes classified on the model entity of dimension `dim` and tag `tag`.
    `nodeTags` contains the node tags (their unique, strictly positive
    identification numbers). `coord` is a vector of length 3 times the length of
    `nodeTags` that contains the x, y, z coordinates of the nodes, concatenated:
    [n1x, n1y, n1z, n2x, ...]. The optional `parametricCoord` vector contains the
    parametric coordinates of the nodes, if any. The length of `parametricCoord` can
    be 0 or `dim` times the length of `nodeTags`. If the `nodeTags` vector is empty,
    new tags are automatically assigned to the nodes.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `nodeTags`: vector of sizes
     - `coord`: vector of doubles
     - `parametricCoord`: vector of doubles
    """
    function addNodes(dim, tag, nodeTags, coord, parametricCoord = Cdouble[])
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshAddNodes, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Csize_t}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              dim, tag, convert(Vector{Csize_t}, nodeTags), length(nodeTags), convert(Vector{Cdouble}, coord), length(coord), convert(Vector{Cdouble}, parametricCoord), length(parametricCoord), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const add_nodes = addNodes
    
    """
        gmsh.model.mesh.reclassifyNodes()
    
    Reclassify all nodes on their associated model entity, based on the elements.
    Can be used when importing nodes in bulk (e.g. by associating them all to a
    single volume), to reclassify them correctly on model surfaces, curves, etc.
    after the elements have been set.
    """
    function reclassifyNodes()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshReclassifyNodes, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const reclassify_nodes = reclassifyNodes
    
    """
        gmsh.model.mesh.relocateNodes(dim = -1, tag = -1)
    
    Relocate the nodes classified on the entity of dimension `dim` and tag `tag`
    using their parametric coordinates. If `tag` < 0, relocate the nodes for all
    entities of dimension `dim`. If `dim` and `tag` are negative, relocate all the
    nodes in the mesh.
    
    Types:
     - `dim`: integer
     - `tag`: integer
    """
    function relocateNodes(dim = -1, tag = -1)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshRelocateNodes, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cint}),
              dim, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const relocate_nodes = relocateNodes
    
    """
        gmsh.model.mesh.getElements(dim = -1, tag = -1)
    
    Get the elements classified on the entity of dimension `dim` and tag `tag`. If
    `tag` < 0, get the elements for all entities of dimension `dim`. If `dim` and
    `tag` are negative, get all the elements in the mesh. `elementTypes` contains
    the MSH types of the elements (e.g. `2` for 3-node triangles: see
    `getElementProperties` to obtain the properties for a given element type).
    `elementTags` is a vector of the same length as `elementTypes`; each entry is a
    vector containing the tags (unique, strictly positive identifiers) of the
    elements of the corresponding type. `nodeTags` is also a vector of the same
    length as `elementTypes`; each entry is a vector of length equal to the number
    of elements of the given type times the number N of nodes for this type of
    element, that contains the node tags of all the elements of the given type,
    concatenated: [e1n1, e1n2, ..., e1nN, e2n1, ...].
    
    Return `elementTypes`, `elementTags`, `nodeTags`.
    
    Types:
     - `elementTypes`: vector of integers
     - `elementTags`: vector of vectors of sizes
     - `nodeTags`: vector of vectors of sizes
     - `dim`: integer
     - `tag`: integer
    """
    function getElements(dim = -1, tag = -1)
        api_elementTypes_ = Ref{Ptr{Cint}}()
        api_elementTypes_n_ = Ref{Csize_t}()
        api_elementTags_ = Ref{Ptr{Ptr{Csize_t}}}()
        api_elementTags_n_ = Ref{Ptr{Csize_t}}()
        api_elementTags_nn_ = Ref{Csize_t}()
        api_nodeTags_ = Ref{Ptr{Ptr{Csize_t}}}()
        api_nodeTags_n_ = Ref{Ptr{Csize_t}}()
        api_nodeTags_nn_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetElements, gmsh.lib), Cvoid,
              (Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Ptr{Ptr{Csize_t}}}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Ptr{Csize_t}}}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Cint, Cint, Ptr{Cint}),
              api_elementTypes_, api_elementTypes_n_, api_elementTags_, api_elementTags_n_, api_elementTags_nn_, api_nodeTags_, api_nodeTags_n_, api_nodeTags_nn_, dim, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        elementTypes = unsafe_wrap(Array, api_elementTypes_[], api_elementTypes_n_[], own = true)
        tmp_api_elementTags_ = unsafe_wrap(Array, api_elementTags_[], api_elementTags_nn_[], own = true)
        tmp_api_elementTags_n_ = unsafe_wrap(Array, api_elementTags_n_[], api_elementTags_nn_[], own = true)
        elementTags = [ unsafe_wrap(Array, tmp_api_elementTags_[i], tmp_api_elementTags_n_[i], own = true) for i in 1:api_elementTags_nn_[] ]
        tmp_api_nodeTags_ = unsafe_wrap(Array, api_nodeTags_[], api_nodeTags_nn_[], own = true)
        tmp_api_nodeTags_n_ = unsafe_wrap(Array, api_nodeTags_n_[], api_nodeTags_nn_[], own = true)
        nodeTags = [ unsafe_wrap(Array, tmp_api_nodeTags_[i], tmp_api_nodeTags_n_[i], own = true) for i in 1:api_nodeTags_nn_[] ]
        return elementTypes, elementTags, nodeTags
    end
    const get_elements = getElements
    
    """
        gmsh.model.mesh.getElement(elementTag)
    
    Get the type and node tags of the element with tag `tag`, as well as the
    dimension `dim` and tag `tag` of the entity on which the element is classified.
    This function relies on an internal cache (a vector in case of dense element
    numbering, a map otherwise); for large meshes accessing elements in bulk is
    often preferable.
    
    Return `elementType`, `nodeTags`, `dim`, `tag`.
    
    Types:
     - `elementTag`: size
     - `elementType`: integer
     - `nodeTags`: vector of sizes
     - `dim`: integer
     - `tag`: integer
    """
    function getElement(elementTag)
        api_elementType_ = Ref{Cint}()
        api_nodeTags_ = Ref{Ptr{Csize_t}}()
        api_nodeTags_n_ = Ref{Csize_t}()
        api_dim_ = Ref{Cint}()
        api_tag_ = Ref{Cint}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetElement, gmsh.lib), Cvoid,
              (Csize_t, Ptr{Cint}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Cint}, Ptr{Cint}, Ptr{Cint}),
              elementTag, api_elementType_, api_nodeTags_, api_nodeTags_n_, api_dim_, api_tag_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        nodeTags = unsafe_wrap(Array, api_nodeTags_[], api_nodeTags_n_[], own = true)
        return api_elementType_[], nodeTags, api_dim_[], api_tag_[]
    end
    const get_element = getElement
    
    """
        gmsh.model.mesh.getElementByCoordinates(x, y, z, dim = -1, strict = false)
    
    Search the mesh for an element located at coordinates (`x`, `y`, `z`). This
    function performs a search in a spatial octree. If an element is found, return
    its tag, type and node tags, as well as the local coordinates (`u`, `v`, `w`)
    within the reference element corresponding to search location. If `dim` is >= 0,
    only search for elements of the given dimension. If `strict` is not set, use a
    tolerance to find elements near the search location.
    
    Return `elementTag`, `elementType`, `nodeTags`, `u`, `v`, `w`.
    
    Types:
     - `x`: double
     - `y`: double
     - `z`: double
     - `elementTag`: size
     - `elementType`: integer
     - `nodeTags`: vector of sizes
     - `u`: double
     - `v`: double
     - `w`: double
     - `dim`: integer
     - `strict`: boolean
    """
    function getElementByCoordinates(x, y, z, dim = -1, strict = false)
        api_elementTag_ = Ref{Csize_t}()
        api_elementType_ = Ref{Cint}()
        api_nodeTags_ = Ref{Ptr{Csize_t}}()
        api_nodeTags_n_ = Ref{Csize_t}()
        api_u_ = Ref{Cdouble}()
        api_v_ = Ref{Cdouble}()
        api_w_ = Ref{Cdouble}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetElementByCoordinates, gmsh.lib), Cvoid,
              (Cdouble, Cdouble, Cdouble, Ptr{Csize_t}, Ptr{Cint}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Cdouble}, Ptr{Cdouble}, Ptr{Cdouble}, Cint, Cint, Ptr{Cint}),
              x, y, z, api_elementTag_, api_elementType_, api_nodeTags_, api_nodeTags_n_, api_u_, api_v_, api_w_, dim, strict, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        nodeTags = unsafe_wrap(Array, api_nodeTags_[], api_nodeTags_n_[], own = true)
        return api_elementTag_[], api_elementType_[], nodeTags, api_u_[], api_v_[], api_w_[]
    end
    const get_element_by_coordinates = getElementByCoordinates
    
    """
        gmsh.model.mesh.getElementsByCoordinates(x, y, z, dim = -1, strict = false)
    
    Search the mesh for element(s) located at coordinates (`x`, `y`, `z`). This
    function performs a search in a spatial octree. Return the tags of all found
    elements in `elementTags`. Additional information about the elements can be
    accessed through `getElement` and `getLocalCoordinatesInElement`. If `dim` is >=
    0, only search for elements of the given dimension. If `strict` is not set, use
    a tolerance to find elements near the search location.
    
    Return `elementTags`.
    
    Types:
     - `x`: double
     - `y`: double
     - `z`: double
     - `elementTags`: vector of sizes
     - `dim`: integer
     - `strict`: boolean
    """
    function getElementsByCoordinates(x, y, z, dim = -1, strict = false)
        api_elementTags_ = Ref{Ptr{Csize_t}}()
        api_elementTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetElementsByCoordinates, gmsh.lib), Cvoid,
              (Cdouble, Cdouble, Cdouble, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Cint, Cint, Ptr{Cint}),
              x, y, z, api_elementTags_, api_elementTags_n_, dim, strict, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        elementTags = unsafe_wrap(Array, api_elementTags_[], api_elementTags_n_[], own = true)
        return elementTags
    end
    const get_elements_by_coordinates = getElementsByCoordinates
    
    """
        gmsh.model.mesh.getLocalCoordinatesInElement(elementTag, x, y, z)
    
    Return the local coordinates (`u`, `v`, `w`) within the element `elementTag`
    corresponding to the model coordinates (`x`, `y`, `z`). This function relies on
    an internal cache (a vector in case of dense element numbering, a map
    otherwise); for large meshes accessing elements in bulk is often preferable.
    
    Return `u`, `v`, `w`.
    
    Types:
     - `elementTag`: size
     - `x`: double
     - `y`: double
     - `z`: double
     - `u`: double
     - `v`: double
     - `w`: double
    """
    function getLocalCoordinatesInElement(elementTag, x, y, z)
        api_u_ = Ref{Cdouble}()
        api_v_ = Ref{Cdouble}()
        api_w_ = Ref{Cdouble}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetLocalCoordinatesInElement, gmsh.lib), Cvoid,
              (Csize_t, Cdouble, Cdouble, Cdouble, Ptr{Cdouble}, Ptr{Cdouble}, Ptr{Cdouble}, Ptr{Cint}),
              elementTag, x, y, z, api_u_, api_v_, api_w_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_u_[], api_v_[], api_w_[]
    end
    const get_local_coordinates_in_element = getLocalCoordinatesInElement
    
    """
        gmsh.model.mesh.getElementTypes(dim = -1, tag = -1)
    
    Get the types of elements in the entity of dimension `dim` and tag `tag`. If
    `tag` < 0, get the types for all entities of dimension `dim`. If `dim` and `tag`
    are negative, get all the types in the mesh.
    
    Return `elementTypes`.
    
    Types:
     - `elementTypes`: vector of integers
     - `dim`: integer
     - `tag`: integer
    """
    function getElementTypes(dim = -1, tag = -1)
        api_elementTypes_ = Ref{Ptr{Cint}}()
        api_elementTypes_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetElementTypes, gmsh.lib), Cvoid,
              (Ptr{Ptr{Cint}}, Ptr{Csize_t}, Cint, Cint, Ptr{Cint}),
              api_elementTypes_, api_elementTypes_n_, dim, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        elementTypes = unsafe_wrap(Array, api_elementTypes_[], api_elementTypes_n_[], own = true)
        return elementTypes
    end
    const get_element_types = getElementTypes
    
    """
        gmsh.model.mesh.getElementType(familyName, order, serendip = false)
    
    Return an element type given its family name `familyName` ("Point", "Line",
    "Triangle", "Quadrangle", "Tetrahedron", "Pyramid", "Prism", "Hexahedron") and
    polynomial order `order`. If `serendip` is true, return the corresponding
    serendip element type (element without interior nodes).
    
    Return an integer.
    
    Types:
     - `familyName`: string
     - `order`: integer
     - `serendip`: boolean
    """
    function getElementType(familyName, order, serendip = false)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelMeshGetElementType, gmsh.lib), Cint,
              (Ptr{Cchar}, Cint, Cint, Ptr{Cint}),
              familyName, order, serendip, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const get_element_type = getElementType
    
    """
        gmsh.model.mesh.getElementProperties(elementType)
    
    Get the properties of an element of type `elementType`: its name
    (`elementName`), dimension (`dim`), order (`order`), number of nodes
    (`numNodes`), local coordinates of the nodes in the reference element
    (`localNodeCoord` vector, of length `dim` times `numNodes`) and number of
    primary (first order) nodes (`numPrimaryNodes`).
    
    Return `elementName`, `dim`, `order`, `numNodes`, `localNodeCoord`, `numPrimaryNodes`.
    
    Types:
     - `elementType`: integer
     - `elementName`: string
     - `dim`: integer
     - `order`: integer
     - `numNodes`: integer
     - `localNodeCoord`: vector of doubles
     - `numPrimaryNodes`: integer
    """
    function getElementProperties(elementType)
        api_elementName_ = Ref{Ptr{Cchar}}()
        api_dim_ = Ref{Cint}()
        api_order_ = Ref{Cint}()
        api_numNodes_ = Ref{Cint}()
        api_localNodeCoord_ = Ref{Ptr{Cdouble}}()
        api_localNodeCoord_n_ = Ref{Csize_t}()
        api_numPrimaryNodes_ = Ref{Cint}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetElementProperties, gmsh.lib), Cvoid,
              (Cint, Ptr{Ptr{Cchar}}, Ptr{Cint}, Ptr{Cint}, Ptr{Cint}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}, Ptr{Cint}),
              elementType, api_elementName_, api_dim_, api_order_, api_numNodes_, api_localNodeCoord_, api_localNodeCoord_n_, api_numPrimaryNodes_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        elementName = unsafe_string(api_elementName_[])
        localNodeCoord = unsafe_wrap(Array, api_localNodeCoord_[], api_localNodeCoord_n_[], own = true)
        return elementName, api_dim_[], api_order_[], api_numNodes_[], localNodeCoord, api_numPrimaryNodes_[]
    end
    const get_element_properties = getElementProperties
    
    """
        gmsh.model.mesh.getElementsByType(elementType, tag = -1, task = 0, numTasks = 1)
    
    Get the elements of type `elementType` classified on the entity of tag `tag`. If
    `tag` < 0, get the elements for all entities. `elementTags` is a vector
    containing the tags (unique, strictly positive identifiers) of the elements of
    the corresponding type. `nodeTags` is a vector of length equal to the number of
    elements of the given type times the number N of nodes for this type of element,
    that contains the node tags of all the elements of the given type, concatenated:
    [e1n1, e1n2, ..., e1nN, e2n1, ...]. If `numTasks` > 1, only compute and return
    the part of the data indexed by `task`.
    
    Return `elementTags`, `nodeTags`.
    
    Types:
     - `elementType`: integer
     - `elementTags`: vector of sizes
     - `nodeTags`: vector of sizes
     - `tag`: integer
     - `task`: size
     - `numTasks`: size
    """
    function getElementsByType(elementType, tag = -1, task = 0, numTasks = 1)
        api_elementTags_ = Ref{Ptr{Csize_t}}()
        api_elementTags_n_ = Ref{Csize_t}()
        api_nodeTags_ = Ref{Ptr{Csize_t}}()
        api_nodeTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetElementsByType, gmsh.lib), Cvoid,
              (Cint, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Cint, Csize_t, Csize_t, Ptr{Cint}),
              elementType, api_elementTags_, api_elementTags_n_, api_nodeTags_, api_nodeTags_n_, tag, task, numTasks, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        elementTags = unsafe_wrap(Array, api_elementTags_[], api_elementTags_n_[], own = true)
        nodeTags = unsafe_wrap(Array, api_nodeTags_[], api_nodeTags_n_[], own = true)
        return elementTags, nodeTags
    end
    const get_elements_by_type = getElementsByType
    
    """
        gmsh.model.mesh.getMaxElementTag()
    
    Get the maximum tag `maxTag` of an element in the mesh.
    
    Return `maxTag`.
    
    Types:
     - `maxTag`: size
    """
    function getMaxElementTag()
        api_maxTag_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetMaxElementTag, gmsh.lib), Cvoid,
              (Ptr{Csize_t}, Ptr{Cint}),
              api_maxTag_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_maxTag_[]
    end
    const get_max_element_tag = getMaxElementTag
    
    """
        gmsh.model.mesh.getElementQualities(elementTags, qualityName = "minSICN", task = 0, numTasks = 1)
    
    Get the quality `elementQualities` of the elements with tags `elementTags`.
    `qualityType` is the requested quality measure: "minSJ" for the minimal scaled
    jacobien, "minSICN" for the minimal signed inverted condition number, "minSIGE"
    for the signed inverted gradient error, "gamma" for the ratio of the inscribed
    to circumcribed sphere radius, "volume" for the volume. If `numTasks` > 1, only
    compute and return the part of the data indexed by `task`.
    
    Return `elementsQuality`.
    
    Types:
     - `elementTags`: vector of sizes
     - `elementsQuality`: vector of doubles
     - `qualityName`: string
     - `task`: size
     - `numTasks`: size
    """
    function getElementQualities(elementTags, qualityName = "minSICN", task = 0, numTasks = 1)
        api_elementsQuality_ = Ref{Ptr{Cdouble}}()
        api_elementsQuality_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetElementQualities, gmsh.lib), Cvoid,
              (Ptr{Csize_t}, Csize_t, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cchar}, Csize_t, Csize_t, Ptr{Cint}),
              convert(Vector{Csize_t}, elementTags), length(elementTags), api_elementsQuality_, api_elementsQuality_n_, qualityName, task, numTasks, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        elementsQuality = unsafe_wrap(Array, api_elementsQuality_[], api_elementsQuality_n_[], own = true)
        return elementsQuality
    end
    const get_element_qualities = getElementQualities
    
    """
        gmsh.model.mesh.addElements(dim, tag, elementTypes, elementTags, nodeTags)
    
    Add elements classified on the entity of dimension `dim` and tag `tag`. `types`
    contains the MSH types of the elements (e.g. `2` for 3-node triangles: see the
    Gmsh reference manual). `elementTags` is a vector of the same length as `types`;
    each entry is a vector containing the tags (unique, strictly positive
    identifiers) of the elements of the corresponding type. `nodeTags` is also a
    vector of the same length as `types`; each entry is a vector of length equal to
    the number of elements of the given type times the number N of nodes per
    element, that contains the node tags of all the elements of the given type,
    concatenated: [e1n1, e1n2, ..., e1nN, e2n1, ...].
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `elementTypes`: vector of integers
     - `elementTags`: vector of vectors of integers (size)
     - `nodeTags`: vector of vectors of integers (size)
    """
    function addElements(dim, tag, elementTypes, elementTags, nodeTags)
        api_elementTags_n_ = [ length(elementTags[i]) for i in 1:length(elementTags) ]
        api_nodeTags_n_ = [ length(nodeTags[i]) for i in 1:length(nodeTags) ]
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshAddElements, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cint}, Csize_t, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Csize_t, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Csize_t, Ptr{Cint}),
              dim, tag, convert(Vector{Cint}, elementTypes), length(elementTypes), convert(Vector{Vector{Csize_t}},elementTags), api_elementTags_n_, length(elementTags), convert(Vector{Vector{Csize_t}},nodeTags), api_nodeTags_n_, length(nodeTags), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const add_elements = addElements
    
    """
        gmsh.model.mesh.addElementsByType(tag, elementType, elementTags, nodeTags)
    
    Add elements of type `elementType` classified on the entity of tag `tag`.
    `elementTags` contains the tags (unique, strictly positive identifiers) of the
    elements of the corresponding type. `nodeTags` is a vector of length equal to
    the number of elements times the number N of nodes per element, that contains
    the node tags of all the elements, concatenated: [e1n1, e1n2, ..., e1nN, e2n1,
    ...]. If the `elementTag` vector is empty, new tags are automatically assigned
    to the elements.
    
    Types:
     - `tag`: integer
     - `elementType`: integer
     - `elementTags`: vector of sizes
     - `nodeTags`: vector of sizes
    """
    function addElementsByType(tag, elementType, elementTags, nodeTags)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshAddElementsByType, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Csize_t}, Csize_t, Ptr{Csize_t}, Csize_t, Ptr{Cint}),
              tag, elementType, convert(Vector{Csize_t}, elementTags), length(elementTags), convert(Vector{Csize_t}, nodeTags), length(nodeTags), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const add_elements_by_type = addElementsByType
    
    """
        gmsh.model.mesh.getIntegrationPoints(elementType, integrationType)
    
    Get the numerical quadrature information for the given element type
    `elementType` and integration rule `integrationType`, where `integrationType`
    concatenates the integration rule family name with the desired order (e.g.
    "Gauss4" for a quadrature suited for integrating 4th order polynomials). The
    "CompositeGauss" family uses tensor-product rules based the 1D Gauss-Legendre
    rule; the "Gauss" family uses an economic scheme when available (i.e. with a
    minimal number of points), and falls back to "CompositeGauss" otherwise. Note
    that integration points for the "Gauss" family can fall outside of the reference
    element for high-order rules. `localCoord` contains the u, v, w coordinates of
    the G integration points in the reference element: [g1u, g1v, g1w, ..., gGu,
    gGv, gGw]. `weights` contains the associated weights: [g1q, ..., gGq].
    
    Return `localCoord`, `weights`.
    
    Types:
     - `elementType`: integer
     - `integrationType`: string
     - `localCoord`: vector of doubles
     - `weights`: vector of doubles
    """
    function getIntegrationPoints(elementType, integrationType)
        api_localCoord_ = Ref{Ptr{Cdouble}}()
        api_localCoord_n_ = Ref{Csize_t}()
        api_weights_ = Ref{Ptr{Cdouble}}()
        api_weights_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetIntegrationPoints, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              elementType, integrationType, api_localCoord_, api_localCoord_n_, api_weights_, api_weights_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        localCoord = unsafe_wrap(Array, api_localCoord_[], api_localCoord_n_[], own = true)
        weights = unsafe_wrap(Array, api_weights_[], api_weights_n_[], own = true)
        return localCoord, weights
    end
    const get_integration_points = getIntegrationPoints
    
    """
        gmsh.model.mesh.getJacobians(elementType, localCoord, tag = -1, task = 0, numTasks = 1)
    
    Get the Jacobians of all the elements of type `elementType` classified on the
    entity of tag `tag`, at the G evaluation points `localCoord` given as
    concatenated u, v, w coordinates in the reference element [g1u, g1v, g1w, ...,
    gGu, gGv, gGw]. Data is returned by element, with elements in the same order as
    in `getElements` and `getElementsByType`. `jacobians` contains for each element
    the 9 entries of the 3x3 Jacobian matrix at each evaluation point. The matrix is
    returned by column: [e1g1Jxu, e1g1Jyu, e1g1Jzu, e1g1Jxv, ..., e1g1Jzw, e1g2Jxu,
    ..., e1gGJzw, e2g1Jxu, ...], with Jxu=dx/du, Jyu=dy/du, etc. `determinants`
    contains for each element the determinant of the Jacobian matrix at each
    evaluation point: [e1g1, e1g2, ... e1gG, e2g1, ...]. `coord` contains for each
    element the x, y, z coordinates of the evaluation points. If `tag` < 0, get the
    Jacobian data for all entities. If `numTasks` > 1, only compute and return the
    part of the data indexed by `task`.
    
    Return `jacobians`, `determinants`, `coord`.
    
    Types:
     - `elementType`: integer
     - `localCoord`: vector of doubles
     - `jacobians`: vector of doubles
     - `determinants`: vector of doubles
     - `coord`: vector of doubles
     - `tag`: integer
     - `task`: size
     - `numTasks`: size
    """
    function getJacobians(elementType, localCoord, tag = -1, task = 0, numTasks = 1)
        api_jacobians_ = Ref{Ptr{Cdouble}}()
        api_jacobians_n_ = Ref{Csize_t}()
        api_determinants_ = Ref{Ptr{Cdouble}}()
        api_determinants_n_ = Ref{Csize_t}()
        api_coord_ = Ref{Ptr{Cdouble}}()
        api_coord_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetJacobians, gmsh.lib), Cvoid,
              (Cint, Ptr{Cdouble}, Csize_t, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Cint, Csize_t, Csize_t, Ptr{Cint}),
              elementType, convert(Vector{Cdouble}, localCoord), length(localCoord), api_jacobians_, api_jacobians_n_, api_determinants_, api_determinants_n_, api_coord_, api_coord_n_, tag, task, numTasks, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        jacobians = unsafe_wrap(Array, api_jacobians_[], api_jacobians_n_[], own = true)
        determinants = unsafe_wrap(Array, api_determinants_[], api_determinants_n_[], own = true)
        coord = unsafe_wrap(Array, api_coord_[], api_coord_n_[], own = true)
        return jacobians, determinants, coord
    end
    const get_jacobians = getJacobians
    
    """
        gmsh.model.mesh.getJacobian(elementTag, localCoord)
    
    Get the Jacobian for a single element `elementTag`, at the G evaluation points
    `localCoord` given as concatenated u, v, w coordinates in the reference element
    [g1u, g1v, g1w, ..., gGu, gGv, gGw]. `jacobians` contains the 9 entries of the
    3x3 Jacobian matrix at each evaluation point. The matrix is returned by column:
    [e1g1Jxu, e1g1Jyu, e1g1Jzu, e1g1Jxv, ..., e1g1Jzw, e1g2Jxu, ..., e1gGJzw,
    e2g1Jxu, ...], with Jxu=dx/du, Jyu=dy/du, etc. `determinants` contains the
    determinant of the Jacobian matrix at each evaluation point. `coord` contains
    the x, y, z coordinates of the evaluation points. This function relies on an
    internal cache (a vector in case of dense element numbering, a map otherwise);
    for large meshes accessing Jacobians in bulk is often preferable.
    
    Return `jacobians`, `determinants`, `coord`.
    
    Types:
     - `elementTag`: size
     - `localCoord`: vector of doubles
     - `jacobians`: vector of doubles
     - `determinants`: vector of doubles
     - `coord`: vector of doubles
    """
    function getJacobian(elementTag, localCoord)
        api_jacobians_ = Ref{Ptr{Cdouble}}()
        api_jacobians_n_ = Ref{Csize_t}()
        api_determinants_ = Ref{Ptr{Cdouble}}()
        api_determinants_n_ = Ref{Csize_t}()
        api_coord_ = Ref{Ptr{Cdouble}}()
        api_coord_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetJacobian, gmsh.lib), Cvoid,
              (Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              elementTag, convert(Vector{Cdouble}, localCoord), length(localCoord), api_jacobians_, api_jacobians_n_, api_determinants_, api_determinants_n_, api_coord_, api_coord_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        jacobians = unsafe_wrap(Array, api_jacobians_[], api_jacobians_n_[], own = true)
        determinants = unsafe_wrap(Array, api_determinants_[], api_determinants_n_[], own = true)
        coord = unsafe_wrap(Array, api_coord_[], api_coord_n_[], own = true)
        return jacobians, determinants, coord
    end
    const get_jacobian = getJacobian
    
    """
        gmsh.model.mesh.getBasisFunctions(elementType, localCoord, functionSpaceType, wantedOrientations = Cint[])
    
    Get the basis functions of the element of type `elementType` at the evaluation
    points `localCoord` (given as concatenated u, v, w coordinates in the reference
    element [g1u, g1v, g1w, ..., gGu, gGv, gGw]), for the function space
    `functionSpaceType`. Currently supported function spaces include "Lagrange" and
    "GradLagrange" for isoparametric Lagrange basis functions and their gradient in
    the u, v, w coordinates of the reference element; "LagrangeN" and
    "GradLagrangeN", with N = 1, 2, ..., for N-th order Lagrange basis functions;
    "H1LegendreN" and "GradH1LegendreN", with N = 1, 2, ..., for N-th order
    hierarchical H1 Legendre functions; "HcurlLegendreN" and "CurlHcurlLegendreN",
    with N = 1, 2, ..., for N-th order curl-conforming basis functions.
    `numComponents` returns the number C of components of a basis function (e.g. 1
    for scalar functions and 3 for vector functions). `basisFunctions` returns the
    value of the N basis functions at the evaluation points, i.e. [g1f1, g1f2, ...,
    g1fN, g2f1, ...] when C == 1 or [g1f1u, g1f1v, g1f1w, g1f2u, ..., g1fNw, g2f1u,
    ...] when C == 3. For basis functions that depend on the orientation of the
    elements, all values for the first orientation are returned first, followed by
    values for the second, etc. `numOrientations` returns the overall number of
    orientations. If the `wantedOrientations` vector is not empty, only return the
    values for the desired orientation indices.
    
    Return `numComponents`, `basisFunctions`, `numOrientations`.
    
    Types:
     - `elementType`: integer
     - `localCoord`: vector of doubles
     - `functionSpaceType`: string
     - `numComponents`: integer
     - `basisFunctions`: vector of doubles
     - `numOrientations`: integer
     - `wantedOrientations`: vector of integers
    """
    function getBasisFunctions(elementType, localCoord, functionSpaceType, wantedOrientations = Cint[])
        api_numComponents_ = Ref{Cint}()
        api_basisFunctions_ = Ref{Ptr{Cdouble}}()
        api_basisFunctions_n_ = Ref{Csize_t}()
        api_numOrientations_ = Ref{Cint}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetBasisFunctions, gmsh.lib), Cvoid,
              (Cint, Ptr{Cdouble}, Csize_t, Ptr{Cchar}, Ptr{Cint}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}, Ptr{Cint}, Csize_t, Ptr{Cint}),
              elementType, convert(Vector{Cdouble}, localCoord), length(localCoord), functionSpaceType, api_numComponents_, api_basisFunctions_, api_basisFunctions_n_, api_numOrientations_, convert(Vector{Cint}, wantedOrientations), length(wantedOrientations), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        basisFunctions = unsafe_wrap(Array, api_basisFunctions_[], api_basisFunctions_n_[], own = true)
        return api_numComponents_[], basisFunctions, api_numOrientations_[]
    end
    const get_basis_functions = getBasisFunctions
    
    """
        gmsh.model.mesh.getBasisFunctionsOrientation(elementType, functionSpaceType, tag = -1, task = 0, numTasks = 1)
    
    Get the orientation index of the elements of type `elementType` in the entity of
    tag `tag`. The arguments have the same meaning as in `getBasisFunctions`.
    `basisFunctionsOrientation` is a vector giving for each element the orientation
    index in the values returned by `getBasisFunctions`. For Lagrange basis
    functions the call is superfluous as it will return a vector of zeros.
    
    Return `basisFunctionsOrientation`.
    
    Types:
     - `elementType`: integer
     - `functionSpaceType`: string
     - `basisFunctionsOrientation`: vector of integers
     - `tag`: integer
     - `task`: size
     - `numTasks`: size
    """
    function getBasisFunctionsOrientation(elementType, functionSpaceType, tag = -1, task = 0, numTasks = 1)
        api_basisFunctionsOrientation_ = Ref{Ptr{Cint}}()
        api_basisFunctionsOrientation_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetBasisFunctionsOrientation, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Cint, Csize_t, Csize_t, Ptr{Cint}),
              elementType, functionSpaceType, api_basisFunctionsOrientation_, api_basisFunctionsOrientation_n_, tag, task, numTasks, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        basisFunctionsOrientation = unsafe_wrap(Array, api_basisFunctionsOrientation_[], api_basisFunctionsOrientation_n_[], own = true)
        return basisFunctionsOrientation
    end
    const get_basis_functions_orientation = getBasisFunctionsOrientation
    
    """
        gmsh.model.mesh.getBasisFunctionsOrientationForElement(elementTag, functionSpaceType)
    
    Get the orientation of a single element `elementTag`.
    
    Return `basisFunctionsOrientation`.
    
    Types:
     - `elementTag`: size
     - `functionSpaceType`: string
     - `basisFunctionsOrientation`: integer
    """
    function getBasisFunctionsOrientationForElement(elementTag, functionSpaceType)
        api_basisFunctionsOrientation_ = Ref{Cint}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetBasisFunctionsOrientationForElement, gmsh.lib), Cvoid,
              (Csize_t, Ptr{Cchar}, Ptr{Cint}, Ptr{Cint}),
              elementTag, functionSpaceType, api_basisFunctionsOrientation_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_basisFunctionsOrientation_[]
    end
    const get_basis_functions_orientation_for_element = getBasisFunctionsOrientationForElement
    
    """
        gmsh.model.mesh.getNumberOfOrientations(elementType, functionSpaceType)
    
    Get the number of possible orientations for elements of type `elementType` and
    function space named `functionSpaceType`.
    
    Return an integer.
    
    Types:
     - `elementType`: integer
     - `functionSpaceType`: string
    """
    function getNumberOfOrientations(elementType, functionSpaceType)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelMeshGetNumberOfOrientations, gmsh.lib), Cint,
              (Cint, Ptr{Cchar}, Ptr{Cint}),
              elementType, functionSpaceType, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const get_number_of_orientations = getNumberOfOrientations
    
    """
        gmsh.model.mesh.getEdges(nodeTags)
    
    Get the global unique mesh edge identifiers `edgeTags` and orientations
    `edgeOrientation` for an input list of node tag pairs defining these edges,
    concatenated in the vector `nodeTags`. Mesh edges are created e.g. by
    `createEdges()`, `getKeys()` or `addEdges()`. The reference positive orientation
    is n1 < n2, where n1 and n2 are the tags of the two edge nodes, which
    corresponds to the local orientation of edge-based basis functions as well.
    
    Return `edgeTags`, `edgeOrientations`.
    
    Types:
     - `nodeTags`: vector of sizes
     - `edgeTags`: vector of sizes
     - `edgeOrientations`: vector of integers
    """
    function getEdges(nodeTags)
        api_edgeTags_ = Ref{Ptr{Csize_t}}()
        api_edgeTags_n_ = Ref{Csize_t}()
        api_edgeOrientations_ = Ref{Ptr{Cint}}()
        api_edgeOrientations_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetEdges, gmsh.lib), Cvoid,
              (Ptr{Csize_t}, Csize_t, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              convert(Vector{Csize_t}, nodeTags), length(nodeTags), api_edgeTags_, api_edgeTags_n_, api_edgeOrientations_, api_edgeOrientations_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        edgeTags = unsafe_wrap(Array, api_edgeTags_[], api_edgeTags_n_[], own = true)
        edgeOrientations = unsafe_wrap(Array, api_edgeOrientations_[], api_edgeOrientations_n_[], own = true)
        return edgeTags, edgeOrientations
    end
    const get_edges = getEdges
    
    """
        gmsh.model.mesh.getFaces(faceType, nodeTags)
    
    Get the global unique mesh face identifiers `faceTags` and orientations
    `faceOrientations` for an input list of a multiple of three (if `faceType` == 3)
    or four (if `faceType` == 4) node tags defining these faces, concatenated in the
    vector `nodeTags`. Mesh faces are created e.g. by `createFaces()`, `getKeys()`
    or `addFaces()`.
    
    Return `faceTags`, `faceOrientations`.
    
    Types:
     - `faceType`: integer
     - `nodeTags`: vector of sizes
     - `faceTags`: vector of sizes
     - `faceOrientations`: vector of integers
    """
    function getFaces(faceType, nodeTags)
        api_faceTags_ = Ref{Ptr{Csize_t}}()
        api_faceTags_n_ = Ref{Csize_t}()
        api_faceOrientations_ = Ref{Ptr{Cint}}()
        api_faceOrientations_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetFaces, gmsh.lib), Cvoid,
              (Cint, Ptr{Csize_t}, Csize_t, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              faceType, convert(Vector{Csize_t}, nodeTags), length(nodeTags), api_faceTags_, api_faceTags_n_, api_faceOrientations_, api_faceOrientations_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        faceTags = unsafe_wrap(Array, api_faceTags_[], api_faceTags_n_[], own = true)
        faceOrientations = unsafe_wrap(Array, api_faceOrientations_[], api_faceOrientations_n_[], own = true)
        return faceTags, faceOrientations
    end
    const get_faces = getFaces
    
    """
        gmsh.model.mesh.createEdges(dimTags = Tuple{Cint,Cint}[])
    
    Create unique mesh edges for the entities `dimTags`, given as a vector of (dim,
    tag) pairs.
    
    Types:
     - `dimTags`: vector of pairs of integers
    """
    function createEdges(dimTags = Tuple{Cint,Cint}[])
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshCreateEdges, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const create_edges = createEdges
    
    """
        gmsh.model.mesh.createFaces(dimTags = Tuple{Cint,Cint}[])
    
    Create unique mesh faces for the entities `dimTags`, given as a vector of (dim,
    tag) pairs.
    
    Types:
     - `dimTags`: vector of pairs of integers
    """
    function createFaces(dimTags = Tuple{Cint,Cint}[])
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshCreateFaces, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const create_faces = createFaces
    
    """
        gmsh.model.mesh.getAllEdges()
    
    Get the global unique identifiers `edgeTags` and the nodes `edgeNodes` of the
    edges in the mesh. Mesh edges are created e.g. by `createEdges()`, `getKeys()`
    or addEdges().
    
    Return `edgeTags`, `edgeNodes`.
    
    Types:
     - `edgeTags`: vector of sizes
     - `edgeNodes`: vector of sizes
    """
    function getAllEdges()
        api_edgeTags_ = Ref{Ptr{Csize_t}}()
        api_edgeTags_n_ = Ref{Csize_t}()
        api_edgeNodes_ = Ref{Ptr{Csize_t}}()
        api_edgeNodes_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetAllEdges, gmsh.lib), Cvoid,
              (Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Cint}),
              api_edgeTags_, api_edgeTags_n_, api_edgeNodes_, api_edgeNodes_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        edgeTags = unsafe_wrap(Array, api_edgeTags_[], api_edgeTags_n_[], own = true)
        edgeNodes = unsafe_wrap(Array, api_edgeNodes_[], api_edgeNodes_n_[], own = true)
        return edgeTags, edgeNodes
    end
    const get_all_edges = getAllEdges
    
    """
        gmsh.model.mesh.getAllFaces(faceType)
    
    Get the global unique identifiers `faceTags` and the nodes `faceNodes` of the
    faces of type `faceType` in the mesh. Mesh faces are created e.g. by
    `createFaces()`, `getKeys()` or addFaces().
    
    Return `faceTags`, `faceNodes`.
    
    Types:
     - `faceType`: integer
     - `faceTags`: vector of sizes
     - `faceNodes`: vector of sizes
    """
    function getAllFaces(faceType)
        api_faceTags_ = Ref{Ptr{Csize_t}}()
        api_faceTags_n_ = Ref{Csize_t}()
        api_faceNodes_ = Ref{Ptr{Csize_t}}()
        api_faceNodes_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetAllFaces, gmsh.lib), Cvoid,
              (Cint, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Cint}),
              faceType, api_faceTags_, api_faceTags_n_, api_faceNodes_, api_faceNodes_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        faceTags = unsafe_wrap(Array, api_faceTags_[], api_faceTags_n_[], own = true)
        faceNodes = unsafe_wrap(Array, api_faceNodes_[], api_faceNodes_n_[], own = true)
        return faceTags, faceNodes
    end
    const get_all_faces = getAllFaces
    
    """
        gmsh.model.mesh.addEdges(edgeTags, edgeNodes)
    
    Add mesh edges defined by their global unique identifiers `edgeTags` and their
    nodes `edgeNodes`.
    
    Types:
     - `edgeTags`: vector of sizes
     - `edgeNodes`: vector of sizes
    """
    function addEdges(edgeTags, edgeNodes)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshAddEdges, gmsh.lib), Cvoid,
              (Ptr{Csize_t}, Csize_t, Ptr{Csize_t}, Csize_t, Ptr{Cint}),
              convert(Vector{Csize_t}, edgeTags), length(edgeTags), convert(Vector{Csize_t}, edgeNodes), length(edgeNodes), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const add_edges = addEdges
    
    """
        gmsh.model.mesh.addFaces(faceType, faceTags, faceNodes)
    
    Add mesh faces of type `faceType` defined by their global unique identifiers
    `faceTags` and their nodes `faceNodes`.
    
    Types:
     - `faceType`: integer
     - `faceTags`: vector of sizes
     - `faceNodes`: vector of sizes
    """
    function addFaces(faceType, faceTags, faceNodes)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshAddFaces, gmsh.lib), Cvoid,
              (Cint, Ptr{Csize_t}, Csize_t, Ptr{Csize_t}, Csize_t, Ptr{Cint}),
              faceType, convert(Vector{Csize_t}, faceTags), length(faceTags), convert(Vector{Csize_t}, faceNodes), length(faceNodes), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const add_faces = addFaces
    
    """
        gmsh.model.mesh.getKeys(elementType, functionSpaceType, tag = -1, returnCoord = true)
    
    Generate the pair of keys for the elements of type `elementType` in the entity
    of tag `tag`, for the `functionSpaceType` function space. Each pair (`typeKey`,
    `entityKey`) uniquely identifies a basis function in the function space. If
    `returnCoord` is set, the `coord` vector contains the x, y, z coordinates
    locating basis functions for sorting purposes. Warning: this is an experimental
    feature and will probably change in a future release.
    
    Return `typeKeys`, `entityKeys`, `coord`.
    
    Types:
     - `elementType`: integer
     - `functionSpaceType`: string
     - `typeKeys`: vector of integers
     - `entityKeys`: vector of sizes
     - `coord`: vector of doubles
     - `tag`: integer
     - `returnCoord`: boolean
    """
    function getKeys(elementType, functionSpaceType, tag = -1, returnCoord = true)
        api_typeKeys_ = Ref{Ptr{Cint}}()
        api_typeKeys_n_ = Ref{Csize_t}()
        api_entityKeys_ = Ref{Ptr{Csize_t}}()
        api_entityKeys_n_ = Ref{Csize_t}()
        api_coord_ = Ref{Ptr{Cdouble}}()
        api_coord_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetKeys, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Cint, Cint, Ptr{Cint}),
              elementType, functionSpaceType, api_typeKeys_, api_typeKeys_n_, api_entityKeys_, api_entityKeys_n_, api_coord_, api_coord_n_, tag, returnCoord, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        typeKeys = unsafe_wrap(Array, api_typeKeys_[], api_typeKeys_n_[], own = true)
        entityKeys = unsafe_wrap(Array, api_entityKeys_[], api_entityKeys_n_[], own = true)
        coord = unsafe_wrap(Array, api_coord_[], api_coord_n_[], own = true)
        return typeKeys, entityKeys, coord
    end
    const get_keys = getKeys
    
    """
        gmsh.model.mesh.getKeysForElement(elementTag, functionSpaceType, returnCoord = true)
    
    Get the pair of keys for a single element `elementTag`.
    
    Return `typeKeys`, `entityKeys`, `coord`.
    
    Types:
     - `elementTag`: size
     - `functionSpaceType`: string
     - `typeKeys`: vector of integers
     - `entityKeys`: vector of sizes
     - `coord`: vector of doubles
     - `returnCoord`: boolean
    """
    function getKeysForElement(elementTag, functionSpaceType, returnCoord = true)
        api_typeKeys_ = Ref{Ptr{Cint}}()
        api_typeKeys_n_ = Ref{Csize_t}()
        api_entityKeys_ = Ref{Ptr{Csize_t}}()
        api_entityKeys_n_ = Ref{Csize_t}()
        api_coord_ = Ref{Ptr{Cdouble}}()
        api_coord_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetKeysForElement, gmsh.lib), Cvoid,
              (Csize_t, Ptr{Cchar}, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Cint, Ptr{Cint}),
              elementTag, functionSpaceType, api_typeKeys_, api_typeKeys_n_, api_entityKeys_, api_entityKeys_n_, api_coord_, api_coord_n_, returnCoord, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        typeKeys = unsafe_wrap(Array, api_typeKeys_[], api_typeKeys_n_[], own = true)
        entityKeys = unsafe_wrap(Array, api_entityKeys_[], api_entityKeys_n_[], own = true)
        coord = unsafe_wrap(Array, api_coord_[], api_coord_n_[], own = true)
        return typeKeys, entityKeys, coord
    end
    const get_keys_for_element = getKeysForElement
    
    """
        gmsh.model.mesh.getNumberOfKeys(elementType, functionSpaceType)
    
    Get the number of keys by elements of type `elementType` for function space
    named `functionSpaceType`.
    
    Return an integer.
    
    Types:
     - `elementType`: integer
     - `functionSpaceType`: string
    """
    function getNumberOfKeys(elementType, functionSpaceType)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelMeshGetNumberOfKeys, gmsh.lib), Cint,
              (Cint, Ptr{Cchar}, Ptr{Cint}),
              elementType, functionSpaceType, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const get_number_of_keys = getNumberOfKeys
    
    """
        gmsh.model.mesh.getKeysInformation(typeKeys, entityKeys, elementType, functionSpaceType)
    
    Get information about the pair of `keys`. `infoKeys` returns information about
    the functions associated with the pairs (`typeKeys`, `entityKey`).
    `infoKeys[0].first` describes the type of function (0 for  vertex function, 1
    for edge function, 2 for face function and 3 for bubble function).
    `infoKeys[0].second` gives the order of the function associated with the key.
    Warning: this is an experimental feature and will probably change in a future
    release.
    
    Return `infoKeys`.
    
    Types:
     - `typeKeys`: vector of integers
     - `entityKeys`: vector of sizes
     - `elementType`: integer
     - `functionSpaceType`: string
     - `infoKeys`: vector of pairs of integers
    """
    function getKeysInformation(typeKeys, entityKeys, elementType, functionSpaceType)
        api_infoKeys_ = Ref{Ptr{Cint}}()
        api_infoKeys_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetKeysInformation, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Csize_t}, Csize_t, Cint, Ptr{Cchar}, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              convert(Vector{Cint}, typeKeys), length(typeKeys), convert(Vector{Csize_t}, entityKeys), length(entityKeys), elementType, functionSpaceType, api_infoKeys_, api_infoKeys_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_infoKeys_ = unsafe_wrap(Array, api_infoKeys_[], api_infoKeys_n_[], own = true)
        infoKeys = [ (tmp_api_infoKeys_[i], tmp_api_infoKeys_[i+1]) for i in 1:2:length(tmp_api_infoKeys_) ]
        return infoKeys
    end
    const get_keys_information = getKeysInformation
    
    """
        gmsh.model.mesh.getBarycenters(elementType, tag, fast, primary, task = 0, numTasks = 1)
    
    Get the barycenters of all elements of type `elementType` classified on the
    entity of tag `tag`. If `primary` is set, only the primary nodes of the elements
    are taken into account for the barycenter calculation. If `fast` is set, the
    function returns the sum of the primary node coordinates (without normalizing by
    the number of nodes). If `tag` < 0, get the barycenters for all entities. If
    `numTasks` > 1, only compute and return the part of the data indexed by `task`.
    
    Return `barycenters`.
    
    Types:
     - `elementType`: integer
     - `tag`: integer
     - `fast`: boolean
     - `primary`: boolean
     - `barycenters`: vector of doubles
     - `task`: size
     - `numTasks`: size
    """
    function getBarycenters(elementType, tag, fast, primary, task = 0, numTasks = 1)
        api_barycenters_ = Ref{Ptr{Cdouble}}()
        api_barycenters_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetBarycenters, gmsh.lib), Cvoid,
              (Cint, Cint, Cint, Cint, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Csize_t, Csize_t, Ptr{Cint}),
              elementType, tag, fast, primary, api_barycenters_, api_barycenters_n_, task, numTasks, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        barycenters = unsafe_wrap(Array, api_barycenters_[], api_barycenters_n_[], own = true)
        return barycenters
    end
    const get_barycenters = getBarycenters
    
    """
        gmsh.model.mesh.getElementEdgeNodes(elementType, tag = -1, primary = false, task = 0, numTasks = 1)
    
    Get the nodes on the edges of all elements of type `elementType` classified on
    the entity of tag `tag`. `nodeTags` contains the node tags of the edges for all
    the elements: [e1a1n1, e1a1n2, e1a2n1, ...]. Data is returned by element, with
    elements in the same order as in `getElements` and `getElementsByType`. If
    `primary` is set, only the primary (begin/end) nodes of the edges are returned.
    If `tag` < 0, get the edge nodes for all entities. If `numTasks` > 1, only
    compute and return the part of the data indexed by `task`.
    
    Return `nodeTags`.
    
    Types:
     - `elementType`: integer
     - `nodeTags`: vector of sizes
     - `tag`: integer
     - `primary`: boolean
     - `task`: size
     - `numTasks`: size
    """
    function getElementEdgeNodes(elementType, tag = -1, primary = false, task = 0, numTasks = 1)
        api_nodeTags_ = Ref{Ptr{Csize_t}}()
        api_nodeTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetElementEdgeNodes, gmsh.lib), Cvoid,
              (Cint, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Cint, Cint, Csize_t, Csize_t, Ptr{Cint}),
              elementType, api_nodeTags_, api_nodeTags_n_, tag, primary, task, numTasks, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        nodeTags = unsafe_wrap(Array, api_nodeTags_[], api_nodeTags_n_[], own = true)
        return nodeTags
    end
    const get_element_edge_nodes = getElementEdgeNodes
    
    """
        gmsh.model.mesh.getElementFaceNodes(elementType, faceType, tag = -1, primary = false, task = 0, numTasks = 1)
    
    Get the nodes on the faces of type `faceType` (3 for triangular faces, 4 for
    quadrangular faces) of all elements of type `elementType` classified on the
    entity of tag `tag`. `nodeTags` contains the node tags of the faces for all
    elements: [e1f1n1, ..., e1f1nFaceType, e1f2n1, ...]. Data is returned by
    element, with elements in the same order as in `getElements` and
    `getElementsByType`. If `primary` is set, only the primary (corner) nodes of the
    faces are returned. If `tag` < 0, get the face nodes for all entities. If
    `numTasks` > 1, only compute and return the part of the data indexed by `task`.
    
    Return `nodeTags`.
    
    Types:
     - `elementType`: integer
     - `faceType`: integer
     - `nodeTags`: vector of sizes
     - `tag`: integer
     - `primary`: boolean
     - `task`: size
     - `numTasks`: size
    """
    function getElementFaceNodes(elementType, faceType, tag = -1, primary = false, task = 0, numTasks = 1)
        api_nodeTags_ = Ref{Ptr{Csize_t}}()
        api_nodeTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetElementFaceNodes, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Cint, Cint, Csize_t, Csize_t, Ptr{Cint}),
              elementType, faceType, api_nodeTags_, api_nodeTags_n_, tag, primary, task, numTasks, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        nodeTags = unsafe_wrap(Array, api_nodeTags_[], api_nodeTags_n_[], own = true)
        return nodeTags
    end
    const get_element_face_nodes = getElementFaceNodes
    
    """
        gmsh.model.mesh.getGhostElements(dim, tag)
    
    Get the ghost elements `elementTags` and their associated `partitions` stored in
    the ghost entity of dimension `dim` and tag `tag`.
    
    Return `elementTags`, `partitions`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `elementTags`: vector of sizes
     - `partitions`: vector of integers
    """
    function getGhostElements(dim, tag)
        api_elementTags_ = Ref{Ptr{Csize_t}}()
        api_elementTags_n_ = Ref{Csize_t}()
        api_partitions_ = Ref{Ptr{Cint}}()
        api_partitions_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetGhostElements, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, tag, api_elementTags_, api_elementTags_n_, api_partitions_, api_partitions_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        elementTags = unsafe_wrap(Array, api_elementTags_[], api_elementTags_n_[], own = true)
        partitions = unsafe_wrap(Array, api_partitions_[], api_partitions_n_[], own = true)
        return elementTags, partitions
    end
    const get_ghost_elements = getGhostElements
    
    """
        gmsh.model.mesh.setSize(dimTags, size)
    
    Set a mesh size constraint on the model entities `dimTags`, given as a vector of
    (dim, tag) pairs. Currently only entities of dimension 0 (points) are handled.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `size`: double
    """
    function setSize(dimTags, size)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetSize, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, size, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_size = setSize
    
    """
        gmsh.model.mesh.getSizes(dimTags)
    
    Get the mesh size constraints (if any) associated with the model entities
    `dimTags`, given as a vector of (dim, tag) pairs. A zero entry in the output
    `sizes` vector indicates that no size constraint is specified on the
    corresponding entity.
    
    Return `sizes`.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `sizes`: vector of doubles
    """
    function getSizes(dimTags)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        api_sizes_ = Ref{Ptr{Cdouble}}()
        api_sizes_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetSizes, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, api_sizes_, api_sizes_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        sizes = unsafe_wrap(Array, api_sizes_[], api_sizes_n_[], own = true)
        return sizes
    end
    const get_sizes = getSizes
    
    """
        gmsh.model.mesh.setSizeAtParametricPoints(dim, tag, parametricCoord, sizes)
    
    Set mesh size constraints at the given parametric points `parametricCoord` on
    the model entity of dimension `dim` and tag `tag`. Currently only entities of
    dimension 1 (lines) are handled.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `parametricCoord`: vector of doubles
     - `sizes`: vector of doubles
    """
    function setSizeAtParametricPoints(dim, tag, parametricCoord, sizes)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetSizeAtParametricPoints, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cdouble}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              dim, tag, convert(Vector{Cdouble}, parametricCoord), length(parametricCoord), convert(Vector{Cdouble}, sizes), length(sizes), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_size_at_parametric_points = setSizeAtParametricPoints
    
    """
        gmsh.model.mesh.setSizeCallback(callback)
    
    Set a mesh size callback for the current model. The callback function should
    take six arguments as input (`dim`, `tag`, `x`, `y`, `z` and `lc`). The first
    two integer arguments correspond to the dimension `dim` and tag `tag` of the
    entity being meshed. The next four double precision arguments correspond to the
    coordinates `x`, `y` and `z` around which to prescribe the mesh size and to the
    mesh size `lc` that would be prescribed if the callback had not been called. The
    callback function should return a double precision number specifying the desired
    mesh size; returning `lc` is equivalent to a no-op.
    
    Types:
     - `callback`: 
    """
    function setSizeCallback(callback)
        api_callback__(dim, tag, x, y, z, lc, data) = callback(dim, tag, x, y, z, lc)
        api_callback_ = @cfunction($api_callback__, Cdouble, (Cint, Cint, Cdouble, Cdouble, Cdouble, Cdouble, Ptr{Cvoid}))
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetSizeCallback, gmsh.lib), Cvoid,
              (Ptr{Cvoid}, Ptr{Cvoid}, Ptr{Cint}),
              api_callback_, C_NULL, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_size_callback = setSizeCallback
    
    """
        gmsh.model.mesh.removeSizeCallback()
    
    Remove the mesh size callback from the current model.
    """
    function removeSizeCallback()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshRemoveSizeCallback, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const remove_size_callback = removeSizeCallback
    
    """
        gmsh.model.mesh.setTransfiniteCurve(tag, numNodes, meshType = "Progression", coef = 1.)
    
    Set a transfinite meshing constraint on the curve `tag`, with `numNodes` nodes
    distributed according to `meshType` and `coef`. Currently supported types are
    "Progression" (geometrical progression with power `coef`), "Bump" (refinement
    toward both extremities of the curve) and "Beta" (beta law).
    
    Types:
     - `tag`: integer
     - `numNodes`: integer
     - `meshType`: string
     - `coef`: double
    """
    function setTransfiniteCurve(tag, numNodes, meshType = "Progression", coef = 1.)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetTransfiniteCurve, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cchar}, Cdouble, Ptr{Cint}),
              tag, numNodes, meshType, coef, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_transfinite_curve = setTransfiniteCurve
    
    """
        gmsh.model.mesh.setTransfiniteSurface(tag, arrangement = "Left", cornerTags = Cint[])
    
    Set a transfinite meshing constraint on the surface `tag`. `arrangement`
    describes the arrangement of the triangles when the surface is not flagged as
    recombined: currently supported values are "Left", "Right", "AlternateLeft" and
    "AlternateRight". `cornerTags` can be used to specify the (3 or 4) corners of
    the transfinite interpolation explicitly; specifying the corners explicitly is
    mandatory if the surface has more that 3 or 4 points on its boundary.
    
    Types:
     - `tag`: integer
     - `arrangement`: string
     - `cornerTags`: vector of integers
    """
    function setTransfiniteSurface(tag, arrangement = "Left", cornerTags = Cint[])
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetTransfiniteSurface, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Ptr{Cint}, Csize_t, Ptr{Cint}),
              tag, arrangement, convert(Vector{Cint}, cornerTags), length(cornerTags), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_transfinite_surface = setTransfiniteSurface
    
    """
        gmsh.model.mesh.setTransfiniteVolume(tag, cornerTags = Cint[])
    
    Set a transfinite meshing constraint on the surface `tag`. `cornerTags` can be
    used to specify the (6 or 8) corners of the transfinite interpolation
    explicitly.
    
    Types:
     - `tag`: integer
     - `cornerTags`: vector of integers
    """
    function setTransfiniteVolume(tag, cornerTags = Cint[])
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetTransfiniteVolume, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}, Csize_t, Ptr{Cint}),
              tag, convert(Vector{Cint}, cornerTags), length(cornerTags), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_transfinite_volume = setTransfiniteVolume
    
    """
        gmsh.model.mesh.setTransfiniteAutomatic(dimTags = Tuple{Cint,Cint}[], cornerAngle = 2.35, recombine = true)
    
    Set transfinite meshing constraints on the model entities in `dimTags`, given as
    a vector of (dim, tag) pairs. Transfinite meshing constraints are added to the
    curves of the quadrangular surfaces and to the faces of 6-sided volumes.
    Quadragular faces with a corner angle superior to `cornerAngle` (in radians) are
    ignored. The number of points is automatically determined from the sizing
    constraints. If `dimTag` is empty, the constraints are applied to all entities
    in the model. If `recombine` is true, the recombine flag is automatically set on
    the transfinite surfaces.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `cornerAngle`: double
     - `recombine`: boolean
    """
    function setTransfiniteAutomatic(dimTags = Tuple{Cint,Cint}[], cornerAngle = 2.35, recombine = true)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetTransfiniteAutomatic, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, cornerAngle, recombine, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_transfinite_automatic = setTransfiniteAutomatic
    
    """
        gmsh.model.mesh.setRecombine(dim, tag, angle = 45.)
    
    Set a recombination meshing constraint on the model entity of dimension `dim`
    and tag `tag`. Currently only entities of dimension 2 (to recombine triangles
    into quadrangles) are supported; `angle` specifies the threshold angle for the
    simple recombination algorithm..
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `angle`: double
    """
    function setRecombine(dim, tag, angle = 45.)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetRecombine, gmsh.lib), Cvoid,
              (Cint, Cint, Cdouble, Ptr{Cint}),
              dim, tag, angle, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_recombine = setRecombine
    
    """
        gmsh.model.mesh.setSmoothing(dim, tag, val)
    
    Set a smoothing meshing constraint on the model entity of dimension `dim` and
    tag `tag`. `val` iterations of a Laplace smoother are applied.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `val`: integer
    """
    function setSmoothing(dim, tag, val)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetSmoothing, gmsh.lib), Cvoid,
              (Cint, Cint, Cint, Ptr{Cint}),
              dim, tag, val, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_smoothing = setSmoothing
    
    """
        gmsh.model.mesh.setReverse(dim, tag, val = true)
    
    Set a reverse meshing constraint on the model entity of dimension `dim` and tag
    `tag`. If `val` is true, the mesh orientation will be reversed with respect to
    the natural mesh orientation (i.e. the orientation consistent with the
    orientation of the geometry). If `val` is false, the mesh is left as-is.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `val`: boolean
    """
    function setReverse(dim, tag, val = true)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetReverse, gmsh.lib), Cvoid,
              (Cint, Cint, Cint, Ptr{Cint}),
              dim, tag, val, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_reverse = setReverse
    
    """
        gmsh.model.mesh.setAlgorithm(dim, tag, val)
    
    Set the meshing algorithm on the model entity of dimension `dim` and tag `tag`.
    Supported values are those of the `Mesh.Algorithm` option, as listed in the Gmsh
    reference manual. Currently only supported for `dim` == 2.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `val`: integer
    """
    function setAlgorithm(dim, tag, val)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetAlgorithm, gmsh.lib), Cvoid,
              (Cint, Cint, Cint, Ptr{Cint}),
              dim, tag, val, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_algorithm = setAlgorithm
    
    """
        gmsh.model.mesh.setSizeFromBoundary(dim, tag, val)
    
    Force the mesh size to be extended from the boundary, or not, for the model
    entity of dimension `dim` and tag `tag`. Currently only supported for `dim` ==
    2.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `val`: integer
    """
    function setSizeFromBoundary(dim, tag, val)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetSizeFromBoundary, gmsh.lib), Cvoid,
              (Cint, Cint, Cint, Ptr{Cint}),
              dim, tag, val, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_size_from_boundary = setSizeFromBoundary
    
    """
        gmsh.model.mesh.setCompound(dim, tags)
    
    Set a compound meshing constraint on the model entities of dimension `dim` and
    tags `tags`. During meshing, compound entities are treated as a single discrete
    entity, which is automatically reparametrized.
    
    Types:
     - `dim`: integer
     - `tags`: vector of integers
    """
    function setCompound(dim, tags)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetCompound, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}, Csize_t, Ptr{Cint}),
              dim, convert(Vector{Cint}, tags), length(tags), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_compound = setCompound
    
    """
        gmsh.model.mesh.setOutwardOrientation(tag)
    
    Set meshing constraints on the bounding surfaces of the volume of tag `tag` so
    that all surfaces are oriented with outward pointing normals; and if a mesh
    already exists, reorient it. Currently only available with the OpenCASCADE
    kernel, as it relies on the STL triangulation.
    
    Types:
     - `tag`: integer
    """
    function setOutwardOrientation(tag)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetOutwardOrientation, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}),
              tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_outward_orientation = setOutwardOrientation
    
    """
        gmsh.model.mesh.removeConstraints(dimTags = Tuple{Cint,Cint}[])
    
    Remove all meshing constraints from the model entities `dimTags`, given as a
    vector of (dim, tag) pairs. If `dimTags` is empty, remove all constraings.
    
    Types:
     - `dimTags`: vector of pairs of integers
    """
    function removeConstraints(dimTags = Tuple{Cint,Cint}[])
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshRemoveConstraints, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const remove_constraints = removeConstraints
    
    """
        gmsh.model.mesh.embed(dim, tags, inDim, inTag)
    
    Embed the model entities of dimension `dim` and tags `tags` in the (`inDim`,
    `inTag`) model entity. The dimension `dim` can 0, 1 or 2 and must be strictly
    smaller than `inDim`, which must be either 2 or 3. The embedded entities should
    not intersect each other or be part of the boundary of the entity `inTag`, whose
    mesh will conform to the mesh of the embedded entities. With the OpenCASCADE
    kernel, if the `fragment` operation is applied to entities of different
    dimensions, the lower dimensional entities will be automatically embedded in the
    higher dimensional entities if they are not on their boundary.
    
    Types:
     - `dim`: integer
     - `tags`: vector of integers
     - `inDim`: integer
     - `inTag`: integer
    """
    function embed(dim, tags, inDim, inTag)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshEmbed, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}, Csize_t, Cint, Cint, Ptr{Cint}),
              dim, convert(Vector{Cint}, tags), length(tags), inDim, inTag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.mesh.removeEmbedded(dimTags, dim = -1)
    
    Remove embedded entities from the model entities `dimTags`, given as a vector of
    (dim, tag) pairs. if `dim` is >= 0, only remove embedded entities of the given
    dimension (e.g. embedded points if `dim` == 0).
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `dim`: integer
    """
    function removeEmbedded(dimTags, dim = -1)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshRemoveEmbedded, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, dim, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const remove_embedded = removeEmbedded
    
    """
        gmsh.model.mesh.getEmbedded(dim, tag)
    
    Get the entities (if any) embedded in the model entity of dimension `dim` and
    tag `tag`.
    
    Return `dimTags`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `dimTags`: vector of pairs of integers
    """
    function getEmbedded(dim, tag)
        api_dimTags_ = Ref{Ptr{Cint}}()
        api_dimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetEmbedded, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, tag, api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_dimTags_ = unsafe_wrap(Array, api_dimTags_[], api_dimTags_n_[], own = true)
        dimTags = [ (tmp_api_dimTags_[i], tmp_api_dimTags_[i+1]) for i in 1:2:length(tmp_api_dimTags_) ]
        return dimTags
    end
    const get_embedded = getEmbedded
    
    """
        gmsh.model.mesh.reorderElements(elementType, tag, ordering)
    
    Reorder the elements of type `elementType` classified on the entity of tag `tag`
    according to the `ordering` vector.
    
    Types:
     - `elementType`: integer
     - `tag`: integer
     - `ordering`: vector of sizes
    """
    function reorderElements(elementType, tag, ordering)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshReorderElements, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Csize_t}, Csize_t, Ptr{Cint}),
              elementType, tag, convert(Vector{Csize_t}, ordering), length(ordering), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const reorder_elements = reorderElements
    
    """
        gmsh.model.mesh.renumberNodes()
    
    Renumber the node tags in a continuous sequence.
    """
    function renumberNodes()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshRenumberNodes, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const renumber_nodes = renumberNodes
    
    """
        gmsh.model.mesh.renumberElements()
    
    Renumber the element tags in a continuous sequence.
    """
    function renumberElements()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshRenumberElements, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const renumber_elements = renumberElements
    
    """
        gmsh.model.mesh.setPeriodic(dim, tags, tagsMaster, affineTransform)
    
    Set the meshes of the entities of dimension `dim` and tag `tags` as periodic
    copies of the meshes of entities `tagsMaster`, using the affine transformation
    specified in `affineTransformation` (16 entries of a 4x4 matrix, by row). If
    used after meshing, generate the periodic node correspondence information
    assuming the meshes of entities `tags` effectively match the meshes of entities
    `tagsMaster` (useful for structured and extruded meshes). Currently only
    available for @code{dim} == 1 and @code{dim} == 2.
    
    Types:
     - `dim`: integer
     - `tags`: vector of integers
     - `tagsMaster`: vector of integers
     - `affineTransform`: vector of doubles
    """
    function setPeriodic(dim, tags, tagsMaster, affineTransform)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetPeriodic, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}, Csize_t, Ptr{Cint}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              dim, convert(Vector{Cint}, tags), length(tags), convert(Vector{Cint}, tagsMaster), length(tagsMaster), convert(Vector{Cdouble}, affineTransform), length(affineTransform), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_periodic = setPeriodic
    
    """
        gmsh.model.mesh.getPeriodic(dim, tags)
    
    Get master entities `tagsMaster` for the entities of dimension `dim` and tags
    `tags`.
    
    Return `tagMaster`.
    
    Types:
     - `dim`: integer
     - `tags`: vector of integers
     - `tagMaster`: vector of integers
    """
    function getPeriodic(dim, tags)
        api_tagMaster_ = Ref{Ptr{Cint}}()
        api_tagMaster_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetPeriodic, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}, Csize_t, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, convert(Vector{Cint}, tags), length(tags), api_tagMaster_, api_tagMaster_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tagMaster = unsafe_wrap(Array, api_tagMaster_[], api_tagMaster_n_[], own = true)
        return tagMaster
    end
    const get_periodic = getPeriodic
    
    """
        gmsh.model.mesh.getPeriodicNodes(dim, tag, includeHighOrderNodes = false)
    
    Get the master entity `tagMaster`, the node tags `nodeTags` and their
    corresponding master node tags `nodeTagsMaster`, and the affine transform
    `affineTransform` for the entity of dimension `dim` and tag `tag`. If
    `includeHighOrderNodes` is set, include high-order nodes in the returned data.
    
    Return `tagMaster`, `nodeTags`, `nodeTagsMaster`, `affineTransform`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `tagMaster`: integer
     - `nodeTags`: vector of sizes
     - `nodeTagsMaster`: vector of sizes
     - `affineTransform`: vector of doubles
     - `includeHighOrderNodes`: boolean
    """
    function getPeriodicNodes(dim, tag, includeHighOrderNodes = false)
        api_tagMaster_ = Ref{Cint}()
        api_nodeTags_ = Ref{Ptr{Csize_t}}()
        api_nodeTags_n_ = Ref{Csize_t}()
        api_nodeTagsMaster_ = Ref{Ptr{Csize_t}}()
        api_nodeTagsMaster_n_ = Ref{Csize_t}()
        api_affineTransform_ = Ref{Ptr{Cdouble}}()
        api_affineTransform_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetPeriodicNodes, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cint}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Cint, Ptr{Cint}),
              dim, tag, api_tagMaster_, api_nodeTags_, api_nodeTags_n_, api_nodeTagsMaster_, api_nodeTagsMaster_n_, api_affineTransform_, api_affineTransform_n_, includeHighOrderNodes, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        nodeTags = unsafe_wrap(Array, api_nodeTags_[], api_nodeTags_n_[], own = true)
        nodeTagsMaster = unsafe_wrap(Array, api_nodeTagsMaster_[], api_nodeTagsMaster_n_[], own = true)
        affineTransform = unsafe_wrap(Array, api_affineTransform_[], api_affineTransform_n_[], own = true)
        return api_tagMaster_[], nodeTags, nodeTagsMaster, affineTransform
    end
    const get_periodic_nodes = getPeriodicNodes
    
    """
        gmsh.model.mesh.getPeriodicKeys(elementType, functionSpaceType, tag, returnCoord = true)
    
    Get the master entity `tagMaster` and the key pairs (`typeKeyMaster`,
    `entityKeyMaster`) corresponding to the entity `tag` and the key pairs
    (`typeKey`, `entityKey`) for the elements of type `elementType` and function
    space type `functionSpaceType`. If `returnCoord` is set, the `coord` and
    `coordMaster` vectors contain the x, y, z coordinates locating basis functions
    for sorting purposes.
    
    Return `tagMaster`, `typeKeys`, `typeKeysMaster`, `entityKeys`, `entityKeysMaster`, `coord`, `coordMaster`.
    
    Types:
     - `elementType`: integer
     - `functionSpaceType`: string
     - `tag`: integer
     - `tagMaster`: integer
     - `typeKeys`: vector of integers
     - `typeKeysMaster`: vector of integers
     - `entityKeys`: vector of sizes
     - `entityKeysMaster`: vector of sizes
     - `coord`: vector of doubles
     - `coordMaster`: vector of doubles
     - `returnCoord`: boolean
    """
    function getPeriodicKeys(elementType, functionSpaceType, tag, returnCoord = true)
        api_tagMaster_ = Ref{Cint}()
        api_typeKeys_ = Ref{Ptr{Cint}}()
        api_typeKeys_n_ = Ref{Csize_t}()
        api_typeKeysMaster_ = Ref{Ptr{Cint}}()
        api_typeKeysMaster_n_ = Ref{Csize_t}()
        api_entityKeys_ = Ref{Ptr{Csize_t}}()
        api_entityKeys_n_ = Ref{Csize_t}()
        api_entityKeysMaster_ = Ref{Ptr{Csize_t}}()
        api_entityKeysMaster_n_ = Ref{Csize_t}()
        api_coord_ = Ref{Ptr{Cdouble}}()
        api_coord_n_ = Ref{Csize_t}()
        api_coordMaster_ = Ref{Ptr{Cdouble}}()
        api_coordMaster_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetPeriodicKeys, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Cint, Ptr{Cint}, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Cint, Ptr{Cint}),
              elementType, functionSpaceType, tag, api_tagMaster_, api_typeKeys_, api_typeKeys_n_, api_typeKeysMaster_, api_typeKeysMaster_n_, api_entityKeys_, api_entityKeys_n_, api_entityKeysMaster_, api_entityKeysMaster_n_, api_coord_, api_coord_n_, api_coordMaster_, api_coordMaster_n_, returnCoord, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        typeKeys = unsafe_wrap(Array, api_typeKeys_[], api_typeKeys_n_[], own = true)
        typeKeysMaster = unsafe_wrap(Array, api_typeKeysMaster_[], api_typeKeysMaster_n_[], own = true)
        entityKeys = unsafe_wrap(Array, api_entityKeys_[], api_entityKeys_n_[], own = true)
        entityKeysMaster = unsafe_wrap(Array, api_entityKeysMaster_[], api_entityKeysMaster_n_[], own = true)
        coord = unsafe_wrap(Array, api_coord_[], api_coord_n_[], own = true)
        coordMaster = unsafe_wrap(Array, api_coordMaster_[], api_coordMaster_n_[], own = true)
        return api_tagMaster_[], typeKeys, typeKeysMaster, entityKeys, entityKeysMaster, coord, coordMaster
    end
    const get_periodic_keys = getPeriodicKeys
    
    """
        gmsh.model.mesh.importStl()
    
    Import the model STL representation (if available) as the current mesh.
    """
    function importStl()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshImportStl, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const import_stl = importStl
    
    """
        gmsh.model.mesh.getDuplicateNodes(dimTags = Tuple{Cint,Cint}[])
    
    Get the `tags` of any duplicate nodes in the mesh of the entities `dimTags`,
    given as a vector of (dim, tag) pairs. If `dimTags` is empty, consider the whole
    mesh.
    
    Return `tags`.
    
    Types:
     - `tags`: vector of sizes
     - `dimTags`: vector of pairs of integers
    """
    function getDuplicateNodes(dimTags = Tuple{Cint,Cint}[])
        api_tags_ = Ref{Ptr{Csize_t}}()
        api_tags_n_ = Ref{Csize_t}()
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshGetDuplicateNodes, gmsh.lib), Cvoid,
              (Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Cint}, Csize_t, Ptr{Cint}),
              api_tags_, api_tags_n_, api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tags = unsafe_wrap(Array, api_tags_[], api_tags_n_[], own = true)
        return tags
    end
    const get_duplicate_nodes = getDuplicateNodes
    
    """
        gmsh.model.mesh.removeDuplicateNodes(dimTags = Tuple{Cint,Cint}[])
    
    Remove duplicate nodes in the mesh of the entities `dimTags`, given as a vector
    of (dim, tag) pairs. If `dimTags` is empty, consider the whole mesh.
    
    Types:
     - `dimTags`: vector of pairs of integers
    """
    function removeDuplicateNodes(dimTags = Tuple{Cint,Cint}[])
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshRemoveDuplicateNodes, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const remove_duplicate_nodes = removeDuplicateNodes
    
    """
        gmsh.model.mesh.removeDuplicateElements(dimTags = Tuple{Cint,Cint}[])
    
    Remove duplicate elements (defined by the same nodes, in the same entity) in the
    mesh of the entities `dimTags`, given as a vector of (dim, tag) pairs. If
    `dimTags` is empty, consider the whole mesh.
    
    Types:
     - `dimTags`: vector of pairs of integers
    """
    function removeDuplicateElements(dimTags = Tuple{Cint,Cint}[])
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshRemoveDuplicateElements, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const remove_duplicate_elements = removeDuplicateElements
    
    """
        gmsh.model.mesh.splitQuadrangles(quality = 1., tag = -1)
    
    Split (into two triangles) all quadrangles in surface `tag` whose quality is
    lower than `quality`. If `tag` < 0, split quadrangles in all surfaces.
    
    Types:
     - `quality`: double
     - `tag`: integer
    """
    function splitQuadrangles(quality = 1., tag = -1)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSplitQuadrangles, gmsh.lib), Cvoid,
              (Cdouble, Cint, Ptr{Cint}),
              quality, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const split_quadrangles = splitQuadrangles
    
    """
        gmsh.model.mesh.setVisibility(elementTags, value)
    
    Set the visibility of the elements of tags `elementTags` to `value`.
    
    Types:
     - `elementTags`: vector of sizes
     - `value`: integer
    """
    function setVisibility(elementTags, value)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshSetVisibility, gmsh.lib), Cvoid,
              (Ptr{Csize_t}, Csize_t, Cint, Ptr{Cint}),
              convert(Vector{Csize_t}, elementTags), length(elementTags), value, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_visibility = setVisibility
    
    """
        gmsh.model.mesh.classifySurfaces(angle, boundary = true, forReparametrization = false, curveAngle = pi, exportDiscrete = true)
    
    Classify ("color") the surface mesh based on the angle threshold `angle` (in
    radians), and create new discrete surfaces, curves and points accordingly. If
    `boundary` is set, also create discrete curves on the boundary if the surface is
    open. If `forReparametrization` is set, create curves and surfaces that can be
    reparametrized using a single map. If `curveAngle` is less than Pi, also force
    curves to be split according to `curveAngle`. If `exportDiscrete` is set, clear
    any built-in CAD kernel entities and export the discrete entities in the built-
    in CAD kernel.
    
    Types:
     - `angle`: double
     - `boundary`: boolean
     - `forReparametrization`: boolean
     - `curveAngle`: double
     - `exportDiscrete`: boolean
    """
    function classifySurfaces(angle, boundary = true, forReparametrization = false, curveAngle = pi, exportDiscrete = true)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshClassifySurfaces, gmsh.lib), Cvoid,
              (Cdouble, Cint, Cint, Cdouble, Cint, Ptr{Cint}),
              angle, boundary, forReparametrization, curveAngle, exportDiscrete, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const classify_surfaces = classifySurfaces
    
    """
        gmsh.model.mesh.createGeometry(dimTags = Tuple{Cint,Cint}[])
    
    Create a geometry for the discrete entities `dimTags` (given as a vector of
    (dim, tag) pairs) represented solely by a mesh (without an underlying CAD
    description), i.e. create a parametrization for discrete curves and surfaces,
    assuming that each can be parametrized with a single map. If `dimTags` is empty,
    create a geometry for all the discrete entities.
    
    Types:
     - `dimTags`: vector of pairs of integers
    """
    function createGeometry(dimTags = Tuple{Cint,Cint}[])
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshCreateGeometry, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const create_geometry = createGeometry
    
    """
        gmsh.model.mesh.createTopology(makeSimplyConnected = true, exportDiscrete = true)
    
    Create a boundary representation from the mesh if the model does not have one
    (e.g. when imported from mesh file formats with no BRep representation of the
    underlying model). If `makeSimplyConnected` is set, enforce simply connected
    discrete surfaces and volumes. If `exportDiscrete` is set, clear any built-in
    CAD kernel entities and export the discrete entities in the built-in CAD kernel.
    
    Types:
     - `makeSimplyConnected`: boolean
     - `exportDiscrete`: boolean
    """
    function createTopology(makeSimplyConnected = true, exportDiscrete = true)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshCreateTopology, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cint}),
              makeSimplyConnected, exportDiscrete, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const create_topology = createTopology
    
    """
        gmsh.model.mesh.addHomologyRequest(type = "Homology", domainTags = Cint[], subdomainTags = Cint[], dims = Cint[])
    
    Add a request to compute a basis representation for homology spaces (if `type`
    == "Homology") or cohomology spaces (if `type` == "Cohomology"). The computation
    domain is given in a list of physical group tags `domainTags`; if empty, the
    whole mesh is the domain. The computation subdomain for relative (co)homology
    computation is given in a list of physical group tags `subdomainTags`; if empty,
    absolute (co)homology is computed. The dimensions of the (co)homology bases to
    be computed are given in the list `dim`; if empty, all bases are computed.
    Resulting basis representation (co)chains are stored as physical groups in the
    mesh. If the request is added before mesh generation, the computation will be
    performed at the end of the meshing pipeline.
    
    Types:
     - `type`: string
     - `domainTags`: vector of integers
     - `subdomainTags`: vector of integers
     - `dims`: vector of integers
    """
    function addHomologyRequest(type = "Homology", domainTags = Cint[], subdomainTags = Cint[], dims = Cint[])
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshAddHomologyRequest, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}, Csize_t, Ptr{Cint}, Csize_t, Ptr{Cint}, Csize_t, Ptr{Cint}),
              type, convert(Vector{Cint}, domainTags), length(domainTags), convert(Vector{Cint}, subdomainTags), length(subdomainTags), convert(Vector{Cint}, dims), length(dims), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const add_homology_request = addHomologyRequest
    
    """
        gmsh.model.mesh.clearHomologyRequests()
    
    Clear all (co)homology computation requests.
    """
    function clearHomologyRequests()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshClearHomologyRequests, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const clear_homology_requests = clearHomologyRequests
    
    """
        gmsh.model.mesh.computeHomology()
    
    Perform the (co)homology computations requested by addHomologyRequest(). The
    newly created physical groups are returned in `dimTags` as a vector of (dim,
    tag) pairs.
    
    Return `dimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
    """
    function computeHomology()
        api_dimTags_ = Ref{Ptr{Cint}}()
        api_dimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshComputeHomology, gmsh.lib), Cvoid,
              (Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_dimTags_ = unsafe_wrap(Array, api_dimTags_[], api_dimTags_n_[], own = true)
        dimTags = [ (tmp_api_dimTags_[i], tmp_api_dimTags_[i+1]) for i in 1:2:length(tmp_api_dimTags_) ]
        return dimTags
    end
    const compute_homology = computeHomology
    
    """
        gmsh.model.mesh.computeCrossField()
    
    Compute a cross field for the current mesh. The function creates 3 views: the H
    function, the Theta function and cross directions. Return the tags of the views.
    
    Return `viewTags`.
    
    Types:
     - `viewTags`: vector of integers
    """
    function computeCrossField()
        api_viewTags_ = Ref{Ptr{Cint}}()
        api_viewTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshComputeCrossField, gmsh.lib), Cvoid,
              (Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              api_viewTags_, api_viewTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        viewTags = unsafe_wrap(Array, api_viewTags_[], api_viewTags_n_[], own = true)
        return viewTags
    end
    const compute_cross_field = computeCrossField
    
    """
        gmsh.model.mesh.triangulate(coord)
    
    Triangulate the points given in the `coord` vector as pairs of u, v coordinates,
    and return the node tags (with numbering starting at 1) of the resulting
    triangles in `tri`.
    
    Return `tri`.
    
    Types:
     - `coord`: vector of doubles
     - `tri`: vector of sizes
    """
    function triangulate(coord)
        api_tri_ = Ref{Ptr{Csize_t}}()
        api_tri_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshTriangulate, gmsh.lib), Cvoid,
              (Ptr{Cdouble}, Csize_t, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Cint}),
              convert(Vector{Cdouble}, coord), length(coord), api_tri_, api_tri_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tri = unsafe_wrap(Array, api_tri_[], api_tri_n_[], own = true)
        return tri
    end
    
    """
        gmsh.model.mesh.tetrahedralize(coord)
    
    Tetrahedralize the points given in the `coord` vector as x, y, z coordinates,
    concatenated, and return the node tags (with numbering starting at 1) of the
    resulting tetrahedra in `tetra`.
    
    Return `tetra`.
    
    Types:
     - `coord`: vector of doubles
     - `tetra`: vector of sizes
    """
    function tetrahedralize(coord)
        api_tetra_ = Ref{Ptr{Csize_t}}()
        api_tetra_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshTetrahedralize, gmsh.lib), Cvoid,
              (Ptr{Cdouble}, Csize_t, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Cint}),
              convert(Vector{Cdouble}, coord), length(coord), api_tetra_, api_tetra_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tetra = unsafe_wrap(Array, api_tetra_[], api_tetra_n_[], own = true)
        return tetra
    end
    
    """
        module gmsh.model.mesh.field
    
    Mesh size field functions
    """
    module field
    
    import ....gmsh
    
    """
        gmsh.model.mesh.field.add(fieldType, tag = -1)
    
    Add a new mesh size field of type `fieldType`. If `tag` is positive, assign the
    tag explicitly; otherwise a new tag is assigned automatically. Return the field
    tag.
    
    Return an integer.
    
    Types:
     - `fieldType`: string
     - `tag`: integer
    """
    function add(fieldType, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelMeshFieldAdd, gmsh.lib), Cint,
              (Ptr{Cchar}, Cint, Ptr{Cint}),
              fieldType, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    
    """
        gmsh.model.mesh.field.remove(tag)
    
    Remove the field with tag `tag`.
    
    Types:
     - `tag`: integer
    """
    function remove(tag)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshFieldRemove, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}),
              tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.mesh.field.list()
    
    Get the list of all fields.
    
    Return `tags`.
    
    Types:
     - `tags`: vector of integers
    """
    function list()
        api_tags_ = Ref{Ptr{Cint}}()
        api_tags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshFieldList, gmsh.lib), Cvoid,
              (Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              api_tags_, api_tags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tags = unsafe_wrap(Array, api_tags_[], api_tags_n_[], own = true)
        return tags
    end
    
    """
        gmsh.model.mesh.field.getType(tag)
    
    Get the type `fieldType` of the field with tag `tag`.
    
    Return `fileType`.
    
    Types:
     - `tag`: integer
     - `fileType`: string
    """
    function getType(tag)
        api_fileType_ = Ref{Ptr{Cchar}}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshFieldGetType, gmsh.lib), Cvoid,
              (Cint, Ptr{Ptr{Cchar}}, Ptr{Cint}),
              tag, api_fileType_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        fileType = unsafe_string(api_fileType_[])
        return fileType
    end
    const get_type = getType
    
    """
        gmsh.model.mesh.field.setNumber(tag, option, value)
    
    Set the numerical option `option` to value `value` for field `tag`.
    
    Types:
     - `tag`: integer
     - `option`: string
     - `value`: double
    """
    function setNumber(tag, option, value)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshFieldSetNumber, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Cdouble, Ptr{Cint}),
              tag, option, value, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_number = setNumber
    
    """
        gmsh.model.mesh.field.getNumber(tag, option)
    
    Get the value of the numerical option `option` for field `tag`.
    
    Return `value`.
    
    Types:
     - `tag`: integer
     - `option`: string
     - `value`: double
    """
    function getNumber(tag, option)
        api_value_ = Ref{Cdouble}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshFieldGetNumber, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Ptr{Cdouble}, Ptr{Cint}),
              tag, option, api_value_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_value_[]
    end
    const get_number = getNumber
    
    """
        gmsh.model.mesh.field.setString(tag, option, value)
    
    Set the string option `option` to value `value` for field `tag`.
    
    Types:
     - `tag`: integer
     - `option`: string
     - `value`: string
    """
    function setString(tag, option, value)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshFieldSetString, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Ptr{Cchar}, Ptr{Cint}),
              tag, option, value, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_string = setString
    
    """
        gmsh.model.mesh.field.getString(tag, option)
    
    Get the value of the string option `option` for field `tag`.
    
    Return `value`.
    
    Types:
     - `tag`: integer
     - `option`: string
     - `value`: string
    """
    function getString(tag, option)
        api_value_ = Ref{Ptr{Cchar}}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshFieldGetString, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Ptr{Ptr{Cchar}}, Ptr{Cint}),
              tag, option, api_value_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        value = unsafe_string(api_value_[])
        return value
    end
    const get_string = getString
    
    """
        gmsh.model.mesh.field.setNumbers(tag, option, values)
    
    Set the numerical list option `option` to value `values` for field `tag`.
    
    Types:
     - `tag`: integer
     - `option`: string
     - `values`: vector of doubles
    """
    function setNumbers(tag, option, values)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshFieldSetNumbers, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              tag, option, convert(Vector{Cdouble}, values), length(values), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_numbers = setNumbers
    
    """
        gmsh.model.mesh.field.getNumbers(tag, option)
    
    Get the value of the numerical list option `option` for field `tag`.
    
    Return `values`.
    
    Types:
     - `tag`: integer
     - `option`: string
     - `values`: vector of doubles
    """
    function getNumbers(tag, option)
        api_values_ = Ref{Ptr{Cdouble}}()
        api_values_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshFieldGetNumbers, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              tag, option, api_values_, api_values_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        values = unsafe_wrap(Array, api_values_[], api_values_n_[], own = true)
        return values
    end
    const get_numbers = getNumbers
    
    """
        gmsh.model.mesh.field.setAsBackgroundMesh(tag)
    
    Set the field `tag` as the background mesh size field.
    
    Types:
     - `tag`: integer
    """
    function setAsBackgroundMesh(tag)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshFieldSetAsBackgroundMesh, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}),
              tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_as_background_mesh = setAsBackgroundMesh
    
    """
        gmsh.model.mesh.field.setAsBoundaryLayer(tag)
    
    Set the field `tag` as a boundary layer size field.
    
    Types:
     - `tag`: integer
    """
    function setAsBoundaryLayer(tag)
        ierr = Ref{Cint}()
        ccall((:gmshModelMeshFieldSetAsBoundaryLayer, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}),
              tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_as_boundary_layer = setAsBoundaryLayer
    
    end # end of module field
    
    end # end of module mesh
    
    """
        module gmsh.model.geo
    
    Built-in CAD kernel functions
    """
    module geo
    
    import ...gmsh
    
    """
        gmsh.model.geo.addPoint(x, y, z, meshSize = 0., tag = -1)
    
    Add a geometrical point in the built-in CAD representation, at coordinates (`x`,
    `y`, `z`). If `meshSize` is > 0, add a meshing constraint at that point. If
    `tag` is positive, set the tag explicitly; otherwise a new tag is selected
    automatically. Return the tag of the point. (Note that the point will be added
    in the current model only after `synchronize` is called. This behavior holds for
    all the entities added in the geo module.)
    
    Return an integer.
    
    Types:
     - `x`: double
     - `y`: double
     - `z`: double
     - `meshSize`: double
     - `tag`: integer
    """
    function addPoint(x, y, z, meshSize = 0., tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddPoint, gmsh.lib), Cint,
              (Cdouble, Cdouble, Cdouble, Cdouble, Cint, Ptr{Cint}),
              x, y, z, meshSize, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_point = addPoint
    
    """
        gmsh.model.geo.addLine(startTag, endTag, tag = -1)
    
    Add a straight line segment in the built-in CAD representation, between the two
    points with tags `startTag` and `endTag`. If `tag` is positive, set the tag
    explicitly; otherwise a new tag is selected automatically. Return the tag of the
    line.
    
    Return an integer.
    
    Types:
     - `startTag`: integer
     - `endTag`: integer
     - `tag`: integer
    """
    function addLine(startTag, endTag, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddLine, gmsh.lib), Cint,
              (Cint, Cint, Cint, Ptr{Cint}),
              startTag, endTag, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_line = addLine
    
    """
        gmsh.model.geo.addCircleArc(startTag, centerTag, endTag, tag = -1, nx = 0., ny = 0., nz = 0.)
    
    Add a circle arc (strictly smaller than Pi) in the built-in CAD representation,
    between the two points with tags `startTag` and `endTag`, and with center
    `centerTag`. If `tag` is positive, set the tag explicitly; otherwise a new tag
    is selected automatically. If (`nx`, `ny`, `nz`) != (0, 0, 0), explicitly set
    the plane of the circle arc. Return the tag of the circle arc.
    
    Return an integer.
    
    Types:
     - `startTag`: integer
     - `centerTag`: integer
     - `endTag`: integer
     - `tag`: integer
     - `nx`: double
     - `ny`: double
     - `nz`: double
    """
    function addCircleArc(startTag, centerTag, endTag, tag = -1, nx = 0., ny = 0., nz = 0.)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddCircleArc, gmsh.lib), Cint,
              (Cint, Cint, Cint, Cint, Cdouble, Cdouble, Cdouble, Ptr{Cint}),
              startTag, centerTag, endTag, tag, nx, ny, nz, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_circle_arc = addCircleArc
    
    """
        gmsh.model.geo.addEllipseArc(startTag, centerTag, majorTag, endTag, tag = -1, nx = 0., ny = 0., nz = 0.)
    
    Add an ellipse arc (strictly smaller than Pi) in the built-in CAD
    representation, between the two points `startTag` and `endTag`, and with center
    `centerTag` and major axis point `majorTag`. If `tag` is positive, set the tag
    explicitly; otherwise a new tag is selected automatically. If (`nx`, `ny`, `nz`)
    != (0, 0, 0), explicitly set the plane of the circle arc. Return the tag of the
    ellipse arc.
    
    Return an integer.
    
    Types:
     - `startTag`: integer
     - `centerTag`: integer
     - `majorTag`: integer
     - `endTag`: integer
     - `tag`: integer
     - `nx`: double
     - `ny`: double
     - `nz`: double
    """
    function addEllipseArc(startTag, centerTag, majorTag, endTag, tag = -1, nx = 0., ny = 0., nz = 0.)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddEllipseArc, gmsh.lib), Cint,
              (Cint, Cint, Cint, Cint, Cint, Cdouble, Cdouble, Cdouble, Ptr{Cint}),
              startTag, centerTag, majorTag, endTag, tag, nx, ny, nz, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_ellipse_arc = addEllipseArc
    
    """
        gmsh.model.geo.addSpline(pointTags, tag = -1)
    
    Add a spline (Catmull-Rom) curve in the built-in CAD representation, going
    through the points `pointTags`. If `tag` is positive, set the tag explicitly;
    otherwise a new tag is selected automatically. Create a periodic curve if the
    first and last points are the same. Return the tag of the spline curve.
    
    Return an integer.
    
    Types:
     - `pointTags`: vector of integers
     - `tag`: integer
    """
    function addSpline(pointTags, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddSpline, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              convert(Vector{Cint}, pointTags), length(pointTags), tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_spline = addSpline
    
    """
        gmsh.model.geo.addBSpline(pointTags, tag = -1)
    
    Add a cubic b-spline curve in the built-in CAD representation, with `pointTags`
    control points. If `tag` is positive, set the tag explicitly; otherwise a new
    tag is selected automatically. Creates a periodic curve if the first and last
    points are the same. Return the tag of the b-spline curve.
    
    Return an integer.
    
    Types:
     - `pointTags`: vector of integers
     - `tag`: integer
    """
    function addBSpline(pointTags, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddBSpline, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              convert(Vector{Cint}, pointTags), length(pointTags), tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_bspline = addBSpline
    
    """
        gmsh.model.geo.addBezier(pointTags, tag = -1)
    
    Add a Bezier curve in the built-in CAD representation, with `pointTags` control
    points. If `tag` is positive, set the tag explicitly; otherwise a new tag is
    selected automatically.  Return the tag of the Bezier curve.
    
    Return an integer.
    
    Types:
     - `pointTags`: vector of integers
     - `tag`: integer
    """
    function addBezier(pointTags, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddBezier, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              convert(Vector{Cint}, pointTags), length(pointTags), tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_bezier = addBezier
    
    """
        gmsh.model.geo.addPolyline(pointTags, tag = -1)
    
    Add a polyline curve in the built-in CAD representation, going through the
    points `pointTags`. If `tag` is positive, set the tag explicitly; otherwise a
    new tag is selected automatically. Create a periodic curve if the first and last
    points are the same. Return the tag of the polyline curve.
    
    Return an integer.
    
    Types:
     - `pointTags`: vector of integers
     - `tag`: integer
    """
    function addPolyline(pointTags, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddPolyline, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              convert(Vector{Cint}, pointTags), length(pointTags), tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_polyline = addPolyline
    
    """
        gmsh.model.geo.addCompoundSpline(curveTags, numIntervals = 5, tag = -1)
    
    Add a spline (Catmull-Rom) curve in the built-in CAD representation, going
    through points sampling the curves in `curveTags`. The density of sampling
    points on each curve is governed by `numIntervals`. If `tag` is positive, set
    the tag explicitly; otherwise a new tag is selected automatically. Return the
    tag of the spline.
    
    Return an integer.
    
    Types:
     - `curveTags`: vector of integers
     - `numIntervals`: integer
     - `tag`: integer
    """
    function addCompoundSpline(curveTags, numIntervals = 5, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddCompoundSpline, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Cint, Ptr{Cint}),
              convert(Vector{Cint}, curveTags), length(curveTags), numIntervals, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_compound_spline = addCompoundSpline
    
    """
        gmsh.model.geo.addCompoundBSpline(curveTags, numIntervals = 20, tag = -1)
    
    Add a b-spline curve in the built-in CAD representation, with control points
    sampling the curves in `curveTags`. The density of sampling points on each curve
    is governed by `numIntervals`. If `tag` is positive, set the tag explicitly;
    otherwise a new tag is selected automatically. Return the tag of the b-spline.
    
    Return an integer.
    
    Types:
     - `curveTags`: vector of integers
     - `numIntervals`: integer
     - `tag`: integer
    """
    function addCompoundBSpline(curveTags, numIntervals = 20, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddCompoundBSpline, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Cint, Ptr{Cint}),
              convert(Vector{Cint}, curveTags), length(curveTags), numIntervals, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_compound_bspline = addCompoundBSpline
    
    """
        gmsh.model.geo.addCurveLoop(curveTags, tag = -1, reorient = false)
    
    Add a curve loop (a closed wire) in the built-in CAD representation, formed by
    the curves `curveTags`. `curveTags` should contain (signed) tags of model
    entities of dimension 1 forming a closed loop: a negative tag signifies that the
    underlying curve is considered with reversed orientation. If `tag` is positive,
    set the tag explicitly; otherwise a new tag is selected automatically. If
    `reorient` is set, automatically reorient the curves if necessary. Return the
    tag of the curve loop.
    
    Return an integer.
    
    Types:
     - `curveTags`: vector of integers
     - `tag`: integer
     - `reorient`: boolean
    """
    function addCurveLoop(curveTags, tag = -1, reorient = false)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddCurveLoop, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Cint, Ptr{Cint}),
              convert(Vector{Cint}, curveTags), length(curveTags), tag, reorient, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_curve_loop = addCurveLoop
    
    """
        gmsh.model.geo.addCurveLoops(curveTags)
    
    Add curve loops in the built-in CAD representation based on the curves
    `curveTags`. Return the `tags` of found curve loops, if any.
    
    Return `tags`.
    
    Types:
     - `curveTags`: vector of integers
     - `tags`: vector of integers
    """
    function addCurveLoops(curveTags)
        api_tags_ = Ref{Ptr{Cint}}()
        api_tags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoAddCurveLoops, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              convert(Vector{Cint}, curveTags), length(curveTags), api_tags_, api_tags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tags = unsafe_wrap(Array, api_tags_[], api_tags_n_[], own = true)
        return tags
    end
    const add_curve_loops = addCurveLoops
    
    """
        gmsh.model.geo.addPlaneSurface(wireTags, tag = -1)
    
    Add a plane surface in the built-in CAD representation, defined by one or more
    curve loops `wireTags`. The first curve loop defines the exterior contour;
    additional curve loop define holes. If `tag` is positive, set the tag
    explicitly; otherwise a new tag is selected automatically. Return the tag of the
    surface.
    
    Return an integer.
    
    Types:
     - `wireTags`: vector of integers
     - `tag`: integer
    """
    function addPlaneSurface(wireTags, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddPlaneSurface, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              convert(Vector{Cint}, wireTags), length(wireTags), tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_plane_surface = addPlaneSurface
    
    """
        gmsh.model.geo.addSurfaceFilling(wireTags, tag = -1, sphereCenterTag = -1)
    
    Add a surface in the built-in CAD representation, filling the curve loops in
    `wireTags` using transfinite interpolation. Currently only a single curve loop
    is supported; this curve loop should be composed by 3 or 4 curves only. If `tag`
    is positive, set the tag explicitly; otherwise a new tag is selected
    automatically. Return the tag of the surface.
    
    Return an integer.
    
    Types:
     - `wireTags`: vector of integers
     - `tag`: integer
     - `sphereCenterTag`: integer
    """
    function addSurfaceFilling(wireTags, tag = -1, sphereCenterTag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddSurfaceFilling, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Cint, Ptr{Cint}),
              convert(Vector{Cint}, wireTags), length(wireTags), tag, sphereCenterTag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_surface_filling = addSurfaceFilling
    
    """
        gmsh.model.geo.addSurfaceLoop(surfaceTags, tag = -1)
    
    Add a surface loop (a closed shell) formed by `surfaceTags` in the built-in CAD
    representation.  If `tag` is positive, set the tag explicitly; otherwise a new
    tag is selected automatically. Return the tag of the shell.
    
    Return an integer.
    
    Types:
     - `surfaceTags`: vector of integers
     - `tag`: integer
    """
    function addSurfaceLoop(surfaceTags, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddSurfaceLoop, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              convert(Vector{Cint}, surfaceTags), length(surfaceTags), tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_surface_loop = addSurfaceLoop
    
    """
        gmsh.model.geo.addVolume(shellTags, tag = -1)
    
    Add a volume (a region) in the built-in CAD representation, defined by one or
    more shells `shellTags`. The first surface loop defines the exterior boundary;
    additional surface loop define holes. If `tag` is positive, set the tag
    explicitly; otherwise a new tag is selected automatically. Return the tag of the
    volume.
    
    Return an integer.
    
    Types:
     - `shellTags`: vector of integers
     - `tag`: integer
    """
    function addVolume(shellTags, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddVolume, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              convert(Vector{Cint}, shellTags), length(shellTags), tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_volume = addVolume
    
    """
        gmsh.model.geo.addGeometry(geometry, numbers = Cdouble[], strings = [], tag = -1)
    
    Add a `geometry` in the built-in CAD representation. `geometry` can currently be
    one of "Sphere" or "PolarSphere" (where `numbers` should contain the x, y, z
    coordinates of the center, followed by the radius), or "Parametric" (where
    `strings` should contains three expression evaluating to the x, y and z
    coordinates. If `tag` is positive, set the tag of the geometry explicitly;
    otherwise a new tag is selected automatically. Return the tag of the geometry.
    
    Return an integer.
    
    Types:
     - `geometry`: string
     - `numbers`: vector of doubles
     - `strings`: vector of strings
     - `tag`: integer
    """
    function addGeometry(geometry, numbers = Cdouble[], strings = [], tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddGeometry, gmsh.lib), Cint,
              (Ptr{Cchar}, Ptr{Cdouble}, Csize_t, Ptr{Ptr{Cchar}}, Csize_t, Cint, Ptr{Cint}),
              geometry, convert(Vector{Cdouble}, numbers), length(numbers), strings, length(strings), tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_geometry = addGeometry
    
    """
        gmsh.model.geo.addPointOnGeometry(geometryTag, x, y, z = 0., meshSize = 0., tag = -1)
    
    Add a point in the built-in CAD representation, at coordinates (`x`, `y`, `z`)
    on the geometry `geometryTag`. If `meshSize` is > 0, add a meshing constraint at
    that point. If `tag` is positive, set the tag explicitly; otherwise a new tag is
    selected automatically. Return the tag of the point. For surface geometries,
    only the `x` and `y` coordinates are used.
    
    Return an integer.
    
    Types:
     - `geometryTag`: integer
     - `x`: double
     - `y`: double
     - `z`: double
     - `meshSize`: double
     - `tag`: integer
    """
    function addPointOnGeometry(geometryTag, x, y, z = 0., meshSize = 0., tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddPointOnGeometry, gmsh.lib), Cint,
              (Cint, Cdouble, Cdouble, Cdouble, Cdouble, Cint, Ptr{Cint}),
              geometryTag, x, y, z, meshSize, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_point_on_geometry = addPointOnGeometry
    
    """
        gmsh.model.geo.extrude(dimTags, dx, dy, dz, numElements = Cint[], heights = Cdouble[], recombine = false)
    
    Extrude the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    built-in CAD representation, using a translation along (`dx`, `dy`, `dz`).
    Return extruded entities in `outDimTags`. If the `numElements` vector is not
    empty, also extrude the mesh: the entries in `numElements` give the number of
    elements in each layer. If the `height` vector is not empty, it provides the
    (cumulative) height of the different layers, normalized to 1. If `recombine` is
    set, recombine the mesh in the layers.
    
    Return `outDimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `dx`: double
     - `dy`: double
     - `dz`: double
     - `outDimTags`: vector of pairs of integers
     - `numElements`: vector of integers
     - `heights`: vector of doubles
     - `recombine`: boolean
    """
    function extrude(dimTags, dx, dy, dz, numElements = Cint[], heights = Cdouble[], recombine = false)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoExtrude, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cdouble, Cdouble, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}, Csize_t, Ptr{Cdouble}, Csize_t, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, dx, dy, dz, api_outDimTags_, api_outDimTags_n_, convert(Vector{Cint}, numElements), length(numElements), convert(Vector{Cdouble}, heights), length(heights), recombine, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    
    """
        gmsh.model.geo.revolve(dimTags, x, y, z, ax, ay, az, angle, numElements = Cint[], heights = Cdouble[], recombine = false)
    
    Extrude the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    built-in CAD representation, using a rotation of `angle` radians around the axis
    of revolution defined by the point (`x`, `y`, `z`) and the direction (`ax`,
    `ay`, `az`). The angle should be strictly smaller than Pi. Return extruded
    entities in `outDimTags`. If the `numElements` vector is not empty, also extrude
    the mesh: the entries in `numElements` give the number of elements in each
    layer. If the `height` vector is not empty, it provides the (cumulative) height
    of the different layers, normalized to 1. If `recombine` is set, recombine the
    mesh in the layers.
    
    Return `outDimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `x`: double
     - `y`: double
     - `z`: double
     - `ax`: double
     - `ay`: double
     - `az`: double
     - `angle`: double
     - `outDimTags`: vector of pairs of integers
     - `numElements`: vector of integers
     - `heights`: vector of doubles
     - `recombine`: boolean
    """
    function revolve(dimTags, x, y, z, ax, ay, az, angle, numElements = Cint[], heights = Cdouble[], recombine = false)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoRevolve, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}, Csize_t, Ptr{Cdouble}, Csize_t, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, x, y, z, ax, ay, az, angle, api_outDimTags_, api_outDimTags_n_, convert(Vector{Cint}, numElements), length(numElements), convert(Vector{Cdouble}, heights), length(heights), recombine, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    
    """
        gmsh.model.geo.twist(dimTags, x, y, z, dx, dy, dz, ax, ay, az, angle, numElements = Cint[], heights = Cdouble[], recombine = false)
    
    Extrude the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    built-in CAD representation, using a combined translation and rotation of
    `angle` radians, along (`dx`, `dy`, `dz`) and around the axis of revolution
    defined by the point (`x`, `y`, `z`) and the direction (`ax`, `ay`, `az`). The
    angle should be strictly smaller than Pi. Return extruded entities in
    `outDimTags`. If the `numElements` vector is not empty, also extrude the mesh:
    the entries in `numElements` give the number of elements in each layer. If the
    `height` vector is not empty, it provides the (cumulative) height of the
    different layers, normalized to 1. If `recombine` is set, recombine the mesh in
    the layers.
    
    Return `outDimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `x`: double
     - `y`: double
     - `z`: double
     - `dx`: double
     - `dy`: double
     - `dz`: double
     - `ax`: double
     - `ay`: double
     - `az`: double
     - `angle`: double
     - `outDimTags`: vector of pairs of integers
     - `numElements`: vector of integers
     - `heights`: vector of doubles
     - `recombine`: boolean
    """
    function twist(dimTags, x, y, z, dx, dy, dz, ax, ay, az, angle, numElements = Cint[], heights = Cdouble[], recombine = false)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoTwist, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}, Csize_t, Ptr{Cdouble}, Csize_t, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, x, y, z, dx, dy, dz, ax, ay, az, angle, api_outDimTags_, api_outDimTags_n_, convert(Vector{Cint}, numElements), length(numElements), convert(Vector{Cdouble}, heights), length(heights), recombine, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    
    """
        gmsh.model.geo.extrudeBoundaryLayer(dimTags, numElements = [1], heights = Cdouble[], recombine = false, second = false, viewIndex = -1)
    
    Extrude the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    built-in CAD representation along the normals of the mesh, creating discrete
    boundary layer entities. Return extruded entities in `outDimTags`. The entries
    in `numElements` give the number of elements in each layer. If the `height`
    vector is not empty, it provides the (cumulative) height of the different
    layers. If `recombine` is set, recombine the mesh in the layers. A second
    boundary layer can be created from the same entities if `second` is set. If
    `viewIndex` is >= 0, use the corresponding view to either specify the normals
    (if the view contains a vector field) or scale the normals (if the view is
    scalar).
    
    Return `outDimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `outDimTags`: vector of pairs of integers
     - `numElements`: vector of integers
     - `heights`: vector of doubles
     - `recombine`: boolean
     - `second`: boolean
     - `viewIndex`: integer
    """
    function extrudeBoundaryLayer(dimTags, numElements = [1], heights = Cdouble[], recombine = false, second = false, viewIndex = -1)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoExtrudeBoundaryLayer, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}, Csize_t, Ptr{Cdouble}, Csize_t, Cint, Cint, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, api_outDimTags_, api_outDimTags_n_, convert(Vector{Cint}, numElements), length(numElements), convert(Vector{Cdouble}, heights), length(heights), recombine, second, viewIndex, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    const extrude_boundary_layer = extrudeBoundaryLayer
    
    """
        gmsh.model.geo.translate(dimTags, dx, dy, dz)
    
    Translate the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    built-in CAD representation along (`dx`, `dy`, `dz`).
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `dx`: double
     - `dy`: double
     - `dz`: double
    """
    function translate(dimTags, dx, dy, dz)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoTranslate, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cdouble, Cdouble, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, dx, dy, dz, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.geo.rotate(dimTags, x, y, z, ax, ay, az, angle)
    
    Rotate the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    built-in CAD representation by `angle` radians around the axis of revolution
    defined by the point (`x`, `y`, `z`) and the direction (`ax`, `ay`, `az`).
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `x`: double
     - `y`: double
     - `z`: double
     - `ax`: double
     - `ay`: double
     - `az`: double
     - `angle`: double
    """
    function rotate(dimTags, x, y, z, ax, ay, az, angle)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoRotate, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, x, y, z, ax, ay, az, angle, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.geo.dilate(dimTags, x, y, z, a, b, c)
    
    Scale the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    built-in CAD representation by factors `a`, `b` and `c` along the three
    coordinate axes; use (`x`, `y`, `z`) as the center of the homothetic
    transformation.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `x`: double
     - `y`: double
     - `z`: double
     - `a`: double
     - `b`: double
     - `c`: double
    """
    function dilate(dimTags, x, y, z, a, b, c)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoDilate, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, x, y, z, a, b, c, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.geo.mirror(dimTags, a, b, c, d)
    
    Mirror the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    built-in CAD representation, with respect to the plane of equation `a` * x + `b`
    * y + `c` * z + `d` = 0.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `a`: double
     - `b`: double
     - `c`: double
     - `d`: double
    """
    function mirror(dimTags, a, b, c, d)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoMirror, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cdouble, Cdouble, Cdouble, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, a, b, c, d, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.geo.symmetrize(dimTags, a, b, c, d)
    
    Mirror the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    built-in CAD representation, with respect to the plane of equation `a` * x + `b`
    * y + `c` * z + `d` = 0. (This is a synonym for `mirror`, which will be
    deprecated in a future release.)
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `a`: double
     - `b`: double
     - `c`: double
     - `d`: double
    """
    function symmetrize(dimTags, a, b, c, d)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoSymmetrize, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cdouble, Cdouble, Cdouble, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, a, b, c, d, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.geo.copy(dimTags)
    
    Copy the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    built-in CAD representation; the new entities are returned in `outDimTags`.
    
    Return `outDimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `outDimTags`: vector of pairs of integers
    """
    function copy(dimTags)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoCopy, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, api_outDimTags_, api_outDimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    
    """
        gmsh.model.geo.remove(dimTags, recursive = false)
    
    Remove the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    built-in CAD representation, provided that they are not on the boundary of
    higher-dimensional entities. If `recursive` is true, remove all the entities on
    their boundaries, down to dimension 0.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `recursive`: boolean
    """
    function remove(dimTags, recursive = false)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoRemove, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, recursive, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.geo.removeAllDuplicates()
    
    Remove all duplicate entities in the built-in CAD representation (different
    entities at the same geometrical location).
    """
    function removeAllDuplicates()
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoRemoveAllDuplicates, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const remove_all_duplicates = removeAllDuplicates
    
    """
        gmsh.model.geo.splitCurve(tag, pointTags)
    
    Split the curve of tag `tag` in the built-in CAD representation, on the
    specified control points `pointTags`. This feature is only available for lines,
    splines and b-splines. Return the tag(s) `curveTags` of the newly created
    curve(s).
    
    Return `curveTags`.
    
    Types:
     - `tag`: integer
     - `pointTags`: vector of integers
     - `curveTags`: vector of integers
    """
    function splitCurve(tag, pointTags)
        api_curveTags_ = Ref{Ptr{Cint}}()
        api_curveTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoSplitCurve, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}, Csize_t, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              tag, convert(Vector{Cint}, pointTags), length(pointTags), api_curveTags_, api_curveTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        curveTags = unsafe_wrap(Array, api_curveTags_[], api_curveTags_n_[], own = true)
        return curveTags
    end
    const split_curve = splitCurve
    
    """
        gmsh.model.geo.getMaxTag(dim)
    
    Get the maximum tag of entities of dimension `dim` in the built-in CAD
    representation.
    
    Return an integer.
    
    Types:
     - `dim`: integer
    """
    function getMaxTag(dim)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoGetMaxTag, gmsh.lib), Cint,
              (Cint, Ptr{Cint}),
              dim, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const get_max_tag = getMaxTag
    
    """
        gmsh.model.geo.setMaxTag(dim, maxTag)
    
    Set the maximum tag `maxTag` for entities of dimension `dim` in the built-in CAD
    representation.
    
    Types:
     - `dim`: integer
     - `maxTag`: integer
    """
    function setMaxTag(dim, maxTag)
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoSetMaxTag, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cint}),
              dim, maxTag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_max_tag = setMaxTag
    
    """
        gmsh.model.geo.addPhysicalGroup(dim, tags, tag = -1, name = "")
    
    Add a physical group of dimension `dim`, grouping the entities with tags `tags`
    in the built-in CAD representation. Return the tag of the physical group, equal
    to `tag` if `tag` is positive, or a new tag if `tag` < 0. Set the name of the
    physical group if `name` is not empty.
    
    Return an integer.
    
    Types:
     - `dim`: integer
     - `tags`: vector of integers
     - `tag`: integer
     - `name`: string
    """
    function addPhysicalGroup(dim, tags, tag = -1, name = "")
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelGeoAddPhysicalGroup, gmsh.lib), Cint,
              (Cint, Ptr{Cint}, Csize_t, Cint, Ptr{Cchar}, Ptr{Cint}),
              dim, convert(Vector{Cint}, tags), length(tags), tag, name, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_physical_group = addPhysicalGroup
    
    """
        gmsh.model.geo.removePhysicalGroups(dimTags = Tuple{Cint,Cint}[])
    
    Remove the physical groups `dimTags` (given as a vector of (dim, tag) pairs)
    from the built-in CAD representation. If `dimTags` is empty, remove all groups.
    
    Types:
     - `dimTags`: vector of pairs of integers
    """
    function removePhysicalGroups(dimTags = Tuple{Cint,Cint}[])
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoRemovePhysicalGroups, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const remove_physical_groups = removePhysicalGroups
    
    """
        gmsh.model.geo.synchronize()
    
    Synchronize the built-in CAD representation with the current Gmsh model. This
    can be called at any time, but since it involves a non trivial amount of
    processing, the number of synchronization points should normally be minimized.
    Without synchronization the entities in the built-in CAD representation are not
    available to any function outside of the built-in CAD kernel functions.
    """
    function synchronize()
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoSynchronize, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        module gmsh.model.geo.mesh
    
    Built-in CAD kernel meshing constraints
    """
    module mesh
    
    import ....gmsh
    
    """
        gmsh.model.geo.mesh.setSize(dimTags, size)
    
    Set a mesh size constraint on the entities `dimTags` (given as a vector of (dim,
    tag) pairs) in the built-in CAD kernel representation. Currently only entities
    of dimension 0 (points) are handled.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `size`: double
    """
    function setSize(dimTags, size)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoMeshSetSize, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, size, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_size = setSize
    
    """
        gmsh.model.geo.mesh.setTransfiniteCurve(tag, nPoints, meshType = "Progression", coef = 1.)
    
    Set a transfinite meshing constraint on the curve `tag` in the built-in CAD
    kernel representation, with `numNodes` nodes distributed according to `meshType`
    and `coef`. Currently supported types are "Progression" (geometrical progression
    with power `coef`) and "Bump" (refinement toward both extremities of the curve).
    
    Types:
     - `tag`: integer
     - `nPoints`: integer
     - `meshType`: string
     - `coef`: double
    """
    function setTransfiniteCurve(tag, nPoints, meshType = "Progression", coef = 1.)
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoMeshSetTransfiniteCurve, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cchar}, Cdouble, Ptr{Cint}),
              tag, nPoints, meshType, coef, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_transfinite_curve = setTransfiniteCurve
    
    """
        gmsh.model.geo.mesh.setTransfiniteSurface(tag, arrangement = "Left", cornerTags = Cint[])
    
    Set a transfinite meshing constraint on the surface `tag` in the built-in CAD
    kernel representation. `arrangement` describes the arrangement of the triangles
    when the surface is not flagged as recombined: currently supported values are
    "Left", "Right", "AlternateLeft" and "AlternateRight". `cornerTags` can be used
    to specify the (3 or 4) corners of the transfinite interpolation explicitly;
    specifying the corners explicitly is mandatory if the surface has more that 3 or
    4 points on its boundary.
    
    Types:
     - `tag`: integer
     - `arrangement`: string
     - `cornerTags`: vector of integers
    """
    function setTransfiniteSurface(tag, arrangement = "Left", cornerTags = Cint[])
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoMeshSetTransfiniteSurface, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Ptr{Cint}, Csize_t, Ptr{Cint}),
              tag, arrangement, convert(Vector{Cint}, cornerTags), length(cornerTags), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_transfinite_surface = setTransfiniteSurface
    
    """
        gmsh.model.geo.mesh.setTransfiniteVolume(tag, cornerTags = Cint[])
    
    Set a transfinite meshing constraint on the surface `tag` in the built-in CAD
    kernel representation. `cornerTags` can be used to specify the (6 or 8) corners
    of the transfinite interpolation explicitly.
    
    Types:
     - `tag`: integer
     - `cornerTags`: vector of integers
    """
    function setTransfiniteVolume(tag, cornerTags = Cint[])
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoMeshSetTransfiniteVolume, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}, Csize_t, Ptr{Cint}),
              tag, convert(Vector{Cint}, cornerTags), length(cornerTags), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_transfinite_volume = setTransfiniteVolume
    
    """
        gmsh.model.geo.mesh.setRecombine(dim, tag, angle = 45.)
    
    Set a recombination meshing constraint on the entity of dimension `dim` and tag
    `tag` in the built-in CAD kernel representation. Currently only entities of
    dimension 2 (to recombine triangles into quadrangles) are supported; `angle`
    specifies the threshold angle for the simple recombination algorithm.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `angle`: double
    """
    function setRecombine(dim, tag, angle = 45.)
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoMeshSetRecombine, gmsh.lib), Cvoid,
              (Cint, Cint, Cdouble, Ptr{Cint}),
              dim, tag, angle, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_recombine = setRecombine
    
    """
        gmsh.model.geo.mesh.setSmoothing(dim, tag, val)
    
    Set a smoothing meshing constraint on the entity of dimension `dim` and tag
    `tag` in the built-in CAD kernel representation. `val` iterations of a Laplace
    smoother are applied.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `val`: integer
    """
    function setSmoothing(dim, tag, val)
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoMeshSetSmoothing, gmsh.lib), Cvoid,
              (Cint, Cint, Cint, Ptr{Cint}),
              dim, tag, val, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_smoothing = setSmoothing
    
    """
        gmsh.model.geo.mesh.setReverse(dim, tag, val = true)
    
    Set a reverse meshing constraint on the entity of dimension `dim` and tag `tag`
    in the built-in CAD kernel representation. If `val` is true, the mesh
    orientation will be reversed with respect to the natural mesh orientation (i.e.
    the orientation consistent with the orientation of the geometry). If `val` is
    false, the mesh is left as-is.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `val`: boolean
    """
    function setReverse(dim, tag, val = true)
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoMeshSetReverse, gmsh.lib), Cvoid,
              (Cint, Cint, Cint, Ptr{Cint}),
              dim, tag, val, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_reverse = setReverse
    
    """
        gmsh.model.geo.mesh.setAlgorithm(dim, tag, val)
    
    Set the meshing algorithm on the entity of dimension `dim` and tag `tag` in the
    built-in CAD kernel representation. Currently only supported for `dim` == 2.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `val`: integer
    """
    function setAlgorithm(dim, tag, val)
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoMeshSetAlgorithm, gmsh.lib), Cvoid,
              (Cint, Cint, Cint, Ptr{Cint}),
              dim, tag, val, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_algorithm = setAlgorithm
    
    """
        gmsh.model.geo.mesh.setSizeFromBoundary(dim, tag, val)
    
    Force the mesh size to be extended from the boundary, or not, for the entity of
    dimension `dim` and tag `tag` in the built-in CAD kernel representation.
    Currently only supported for `dim` == 2.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `val`: integer
    """
    function setSizeFromBoundary(dim, tag, val)
        ierr = Ref{Cint}()
        ccall((:gmshModelGeoMeshSetSizeFromBoundary, gmsh.lib), Cvoid,
              (Cint, Cint, Cint, Ptr{Cint}),
              dim, tag, val, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_size_from_boundary = setSizeFromBoundary
    
    end # end of module mesh
    
    end # end of module geo
    
    """
        module gmsh.model.occ
    
    OpenCASCADE CAD kernel functions
    """
    module occ
    
    import ...gmsh
    
    """
        gmsh.model.occ.addPoint(x, y, z, meshSize = 0., tag = -1)
    
    Add a geometrical point in the OpenCASCADE CAD representation, at coordinates
    (`x`, `y`, `z`). If `meshSize` is > 0, add a meshing constraint at that point.
    If `tag` is positive, set the tag explicitly; otherwise a new tag is selected
    automatically. Return the tag of the point. (Note that the point will be added
    in the current model only after `synchronize` is called. This behavior holds for
    all the entities added in the occ module.)
    
    Return an integer.
    
    Types:
     - `x`: double
     - `y`: double
     - `z`: double
     - `meshSize`: double
     - `tag`: integer
    """
    function addPoint(x, y, z, meshSize = 0., tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddPoint, gmsh.lib), Cint,
              (Cdouble, Cdouble, Cdouble, Cdouble, Cint, Ptr{Cint}),
              x, y, z, meshSize, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_point = addPoint
    
    """
        gmsh.model.occ.addLine(startTag, endTag, tag = -1)
    
    Add a straight line segment in the OpenCASCADE CAD representation, between the
    two points with tags `startTag` and `endTag`. If `tag` is positive, set the tag
    explicitly; otherwise a new tag is selected automatically. Return the tag of the
    line.
    
    Return an integer.
    
    Types:
     - `startTag`: integer
     - `endTag`: integer
     - `tag`: integer
    """
    function addLine(startTag, endTag, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddLine, gmsh.lib), Cint,
              (Cint, Cint, Cint, Ptr{Cint}),
              startTag, endTag, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_line = addLine
    
    """
        gmsh.model.occ.addCircleArc(startTag, centerTag, endTag, tag = -1)
    
    Add a circle arc in the OpenCASCADE CAD representation, between the two points
    with tags `startTag` and `endTag`, with center `centerTag`. If `tag` is
    positive, set the tag explicitly; otherwise a new tag is selected automatically.
    Return the tag of the circle arc.
    
    Return an integer.
    
    Types:
     - `startTag`: integer
     - `centerTag`: integer
     - `endTag`: integer
     - `tag`: integer
    """
    function addCircleArc(startTag, centerTag, endTag, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddCircleArc, gmsh.lib), Cint,
              (Cint, Cint, Cint, Cint, Ptr{Cint}),
              startTag, centerTag, endTag, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_circle_arc = addCircleArc
    
    """
        gmsh.model.occ.addCircle(x, y, z, r, tag = -1, angle1 = 0., angle2 = 2*pi, zAxis = Cdouble[], xAxis = Cdouble[])
    
    Add a circle of center (`x`, `y`, `z`) and radius `r` in the OpenCASCADE CAD
    representation. If `tag` is positive, set the tag explicitly; otherwise a new
    tag is selected automatically. If `angle1` and `angle2` are specified, create a
    circle arc between the two angles. If a vector `zAxis` of size 3 is provided,
    use it as the normal to the circle plane (z-axis). If a vector `xAxis` of size 3
    is provided in addition to `zAxis`, use it to define the x-axis. Return the tag
    of the circle.
    
    Return an integer.
    
    Types:
     - `x`: double
     - `y`: double
     - `z`: double
     - `r`: double
     - `tag`: integer
     - `angle1`: double
     - `angle2`: double
     - `zAxis`: vector of doubles
     - `xAxis`: vector of doubles
    """
    function addCircle(x, y, z, r, tag = -1, angle1 = 0., angle2 = 2*pi, zAxis = Cdouble[], xAxis = Cdouble[])
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddCircle, gmsh.lib), Cint,
              (Cdouble, Cdouble, Cdouble, Cdouble, Cint, Cdouble, Cdouble, Ptr{Cdouble}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              x, y, z, r, tag, angle1, angle2, convert(Vector{Cdouble}, zAxis), length(zAxis), convert(Vector{Cdouble}, xAxis), length(xAxis), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_circle = addCircle
    
    """
        gmsh.model.occ.addEllipseArc(startTag, centerTag, majorTag, endTag, tag = -1)
    
    Add an ellipse arc in the OpenCASCADE CAD representation, between the two points
    `startTag` and `endTag`, and with center `centerTag` and major axis point
    `majorTag`. If `tag` is positive, set the tag explicitly; otherwise a new tag is
    selected automatically. Return the tag of the ellipse arc. Note that OpenCASCADE
    does not allow creating ellipse arcs with the major radius smaller than the
    minor radius.
    
    Return an integer.
    
    Types:
     - `startTag`: integer
     - `centerTag`: integer
     - `majorTag`: integer
     - `endTag`: integer
     - `tag`: integer
    """
    function addEllipseArc(startTag, centerTag, majorTag, endTag, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddEllipseArc, gmsh.lib), Cint,
              (Cint, Cint, Cint, Cint, Cint, Ptr{Cint}),
              startTag, centerTag, majorTag, endTag, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_ellipse_arc = addEllipseArc
    
    """
        gmsh.model.occ.addEllipse(x, y, z, r1, r2, tag = -1, angle1 = 0., angle2 = 2*pi, zAxis = Cdouble[], xAxis = Cdouble[])
    
    Add an ellipse of center (`x`, `y`, `z`) and radii `r1` and `r2` (with `r1` >=
    `r2`) along the x- and y-axes, respectively, in the OpenCASCADE CAD
    representation. If `tag` is positive, set the tag explicitly; otherwise a new
    tag is selected automatically. If `angle1` and `angle2` are specified, create an
    ellipse arc between the two angles. If a vector `zAxis` of size 3 is provided,
    use it as the normal to the ellipse plane (z-axis). If a vector `xAxis` of size
    3 is provided in addition to `zAxis`, use it to define the x-axis. Return the
    tag of the ellipse.
    
    Return an integer.
    
    Types:
     - `x`: double
     - `y`: double
     - `z`: double
     - `r1`: double
     - `r2`: double
     - `tag`: integer
     - `angle1`: double
     - `angle2`: double
     - `zAxis`: vector of doubles
     - `xAxis`: vector of doubles
    """
    function addEllipse(x, y, z, r1, r2, tag = -1, angle1 = 0., angle2 = 2*pi, zAxis = Cdouble[], xAxis = Cdouble[])
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddEllipse, gmsh.lib), Cint,
              (Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cint, Cdouble, Cdouble, Ptr{Cdouble}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              x, y, z, r1, r2, tag, angle1, angle2, convert(Vector{Cdouble}, zAxis), length(zAxis), convert(Vector{Cdouble}, xAxis), length(xAxis), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_ellipse = addEllipse
    
    """
        gmsh.model.occ.addSpline(pointTags, tag = -1, tangents = Cdouble[])
    
    Add a spline (C2 b-spline) curve in the OpenCASCADE CAD representation, going
    through the points `pointTags`. If `tag` is positive, set the tag explicitly;
    otherwise a new tag is selected automatically. Create a periodic curve if the
    first and last points are the same. Return the tag of the spline curve. If the
    `tangents` vector contains 6 entries, use them as concatenated x, y, z
    components of the initial and final tangents of the b-spline; if it contains 3
    times as many entries as the number of points, use them as concatenated x, y, z
    components of the tangents at each point, unless the norm of the tangent is
    zero.
    
    Return an integer.
    
    Types:
     - `pointTags`: vector of integers
     - `tag`: integer
     - `tangents`: vector of doubles
    """
    function addSpline(pointTags, tag = -1, tangents = Cdouble[])
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddSpline, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              convert(Vector{Cint}, pointTags), length(pointTags), tag, convert(Vector{Cdouble}, tangents), length(tangents), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_spline = addSpline
    
    """
        gmsh.model.occ.addBSpline(pointTags, tag = -1, degree = 3, weights = Cdouble[], knots = Cdouble[], multiplicities = Cint[])
    
    Add a b-spline curve of degree `degree` in the OpenCASCADE CAD representation,
    with `pointTags` control points. If `weights`, `knots` or `multiplicities` are
    not provided, default parameters are computed automatically. If `tag` is
    positive, set the tag explicitly; otherwise a new tag is selected automatically.
    Create a periodic curve if the first and last points are the same. Return the
    tag of the b-spline curve.
    
    Return an integer.
    
    Types:
     - `pointTags`: vector of integers
     - `tag`: integer
     - `degree`: integer
     - `weights`: vector of doubles
     - `knots`: vector of doubles
     - `multiplicities`: vector of integers
    """
    function addBSpline(pointTags, tag = -1, degree = 3, weights = Cdouble[], knots = Cdouble[], multiplicities = Cint[])
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddBSpline, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Cint, Ptr{Cdouble}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Cint}, Csize_t, Ptr{Cint}),
              convert(Vector{Cint}, pointTags), length(pointTags), tag, degree, convert(Vector{Cdouble}, weights), length(weights), convert(Vector{Cdouble}, knots), length(knots), convert(Vector{Cint}, multiplicities), length(multiplicities), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_bspline = addBSpline
    
    """
        gmsh.model.occ.addBezier(pointTags, tag = -1)
    
    Add a Bezier curve in the OpenCASCADE CAD representation, with `pointTags`
    control points. If `tag` is positive, set the tag explicitly; otherwise a new
    tag is selected automatically. Return the tag of the Bezier curve.
    
    Return an integer.
    
    Types:
     - `pointTags`: vector of integers
     - `tag`: integer
    """
    function addBezier(pointTags, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddBezier, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              convert(Vector{Cint}, pointTags), length(pointTags), tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_bezier = addBezier
    
    """
        gmsh.model.occ.addWire(curveTags, tag = -1, checkClosed = false)
    
    Add a wire (open or closed) in the OpenCASCADE CAD representation, formed by the
    curves `curveTags`. Note that an OpenCASCADE wire can be made of curves that
    share geometrically identical (but topologically different) points. If `tag` is
    positive, set the tag explicitly; otherwise a new tag is selected automatically.
    Return the tag of the wire.
    
    Return an integer.
    
    Types:
     - `curveTags`: vector of integers
     - `tag`: integer
     - `checkClosed`: boolean
    """
    function addWire(curveTags, tag = -1, checkClosed = false)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddWire, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Cint, Ptr{Cint}),
              convert(Vector{Cint}, curveTags), length(curveTags), tag, checkClosed, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_wire = addWire
    
    """
        gmsh.model.occ.addCurveLoop(curveTags, tag = -1)
    
    Add a curve loop (a closed wire) in the OpenCASCADE CAD representation, formed
    by the curves `curveTags`. `curveTags` should contain tags of curves forming a
    closed loop. Negative tags can be specified for compatibility with the built-in
    kernel, but are simply ignored: the wire is oriented according to the
    orientation of its first curve. Note that an OpenCASCADE curve loop can be made
    of curves that share geometrically identical (but topologically different)
    points. If `tag` is positive, set the tag explicitly; otherwise a new tag is
    selected automatically. Return the tag of the curve loop.
    
    Return an integer.
    
    Types:
     - `curveTags`: vector of integers
     - `tag`: integer
    """
    function addCurveLoop(curveTags, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddCurveLoop, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              convert(Vector{Cint}, curveTags), length(curveTags), tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_curve_loop = addCurveLoop
    
    """
        gmsh.model.occ.addRectangle(x, y, z, dx, dy, tag = -1, roundedRadius = 0.)
    
    Add a rectangle in the OpenCASCADE CAD representation, with lower left corner at
    (`x`, `y`, `z`) and upper right corner at (`x` + `dx`, `y` + `dy`, `z`). If
    `tag` is positive, set the tag explicitly; otherwise a new tag is selected
    automatically. Round the corners if `roundedRadius` is nonzero. Return the tag
    of the rectangle.
    
    Return an integer.
    
    Types:
     - `x`: double
     - `y`: double
     - `z`: double
     - `dx`: double
     - `dy`: double
     - `tag`: integer
     - `roundedRadius`: double
    """
    function addRectangle(x, y, z, dx, dy, tag = -1, roundedRadius = 0.)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddRectangle, gmsh.lib), Cint,
              (Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cint, Cdouble, Ptr{Cint}),
              x, y, z, dx, dy, tag, roundedRadius, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_rectangle = addRectangle
    
    """
        gmsh.model.occ.addDisk(xc, yc, zc, rx, ry, tag = -1, zAxis = Cdouble[], xAxis = Cdouble[])
    
    Add a disk in the OpenCASCADE CAD representation, with center (`xc`, `yc`, `zc`)
    and radius `rx` along the x-axis and `ry` along the y-axis (`rx` >= `ry`). If
    `tag` is positive, set the tag explicitly; otherwise a new tag is selected
    automatically. If a vector `zAxis` of size 3 is provided, use it as the normal
    to the disk (z-axis). If a vector `xAxis` of size 3 is provided in addition to
    `zAxis`, use it to define the x-axis. Return the tag of the disk.
    
    Return an integer.
    
    Types:
     - `xc`: double
     - `yc`: double
     - `zc`: double
     - `rx`: double
     - `ry`: double
     - `tag`: integer
     - `zAxis`: vector of doubles
     - `xAxis`: vector of doubles
    """
    function addDisk(xc, yc, zc, rx, ry, tag = -1, zAxis = Cdouble[], xAxis = Cdouble[])
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddDisk, gmsh.lib), Cint,
              (Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cint, Ptr{Cdouble}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              xc, yc, zc, rx, ry, tag, convert(Vector{Cdouble}, zAxis), length(zAxis), convert(Vector{Cdouble}, xAxis), length(xAxis), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_disk = addDisk
    
    """
        gmsh.model.occ.addPlaneSurface(wireTags, tag = -1)
    
    Add a plane surface in the OpenCASCADE CAD representation, defined by one or
    more curve loops (or closed wires) `wireTags`. The first curve loop defines the
    exterior contour; additional curve loop define holes. If `tag` is positive, set
    the tag explicitly; otherwise a new tag is selected automatically. Return the
    tag of the surface.
    
    Return an integer.
    
    Types:
     - `wireTags`: vector of integers
     - `tag`: integer
    """
    function addPlaneSurface(wireTags, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddPlaneSurface, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              convert(Vector{Cint}, wireTags), length(wireTags), tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_plane_surface = addPlaneSurface
    
    """
        gmsh.model.occ.addSurfaceFilling(wireTag, tag = -1, pointTags = Cint[], degree = 3, numPointsOnCurves = 15, numIter = 2, anisotropic = false, tol2d = 0.00001, tol3d = 0.0001, tolAng = 0.01, tolCurv = 0.1, maxDegree = 8, maxSegments = 9)
    
    Add a surface in the OpenCASCADE CAD representation, filling the curve loop
    `wireTag`. If `tag` is positive, set the tag explicitly; otherwise a new tag is
    selected automatically. Return the tag of the surface. If `pointTags` are
    provided, force the surface to pass through the given points. The other optional
    arguments are `degree` (the degree of the energy criterion to minimize for
    computing the deformation of the surface), `numPointsOnCurves` (the average
    number of points for discretisation of the bounding curves), `numIter` (the
    maximum number of iterations of the optimization process), `anisotropic`
    (improve performance when the ratio of the length along the two parametric
    coordinates of the surface is high), `tol2d` (tolerance to the constraints in
    the parametric plane of the surface), `tol3d` (the maximum distance allowed
    between the support surface and the constraints), `tolAng` (the maximum angle
    allowed between the normal of the surface and the constraints), `tolCurv` (the
    maximum difference of curvature allowed between the surface and the constraint),
    `maxDegree` (the highest degree which the polynomial defining the filling
    surface can have) and, `maxSegments` (the largest number of segments which the
    filling surface can have).
    
    Return an integer.
    
    Types:
     - `wireTag`: integer
     - `tag`: integer
     - `pointTags`: vector of integers
     - `degree`: integer
     - `numPointsOnCurves`: integer
     - `numIter`: integer
     - `anisotropic`: boolean
     - `tol2d`: double
     - `tol3d`: double
     - `tolAng`: double
     - `tolCurv`: double
     - `maxDegree`: integer
     - `maxSegments`: integer
    """
    function addSurfaceFilling(wireTag, tag = -1, pointTags = Cint[], degree = 3, numPointsOnCurves = 15, numIter = 2, anisotropic = false, tol2d = 0.00001, tol3d = 0.0001, tolAng = 0.01, tolCurv = 0.1, maxDegree = 8, maxSegments = 9)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddSurfaceFilling, gmsh.lib), Cint,
              (Cint, Cint, Ptr{Cint}, Csize_t, Cint, Cint, Cint, Cint, Cdouble, Cdouble, Cdouble, Cdouble, Cint, Cint, Ptr{Cint}),
              wireTag, tag, convert(Vector{Cint}, pointTags), length(pointTags), degree, numPointsOnCurves, numIter, anisotropic, tol2d, tol3d, tolAng, tolCurv, maxDegree, maxSegments, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_surface_filling = addSurfaceFilling
    
    """
        gmsh.model.occ.addBSplineFilling(wireTag, tag = -1, type = "")
    
    Add a BSpline surface in the OpenCASCADE CAD representation, filling the curve
    loop `wireTag`. The curve loop should be made of 2, 3 or 4 curves. The optional
    `type` argument specifies the type of filling: "Stretch" creates the flattest
    patch, "Curved" (the default) creates the most rounded patch, and "Coons"
    creates a rounded patch with less depth than "Curved". If `tag` is positive, set
    the tag explicitly; otherwise a new tag is selected automatically. Return the
    tag of the surface.
    
    Return an integer.
    
    Types:
     - `wireTag`: integer
     - `tag`: integer
     - `type`: string
    """
    function addBSplineFilling(wireTag, tag = -1, type = "")
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddBSplineFilling, gmsh.lib), Cint,
              (Cint, Cint, Ptr{Cchar}, Ptr{Cint}),
              wireTag, tag, type, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_bspline_filling = addBSplineFilling
    
    """
        gmsh.model.occ.addBezierFilling(wireTag, tag = -1, type = "")
    
    Add a Bezier surface in the OpenCASCADE CAD representation, filling the curve
    loop `wireTag`. The curve loop should be made of 2, 3 or 4 Bezier curves. The
    optional `type` argument specifies the type of filling: "Stretch" creates the
    flattest patch, "Curved" (the default) creates the most rounded patch, and
    "Coons" creates a rounded patch with less depth than "Curved". If `tag` is
    positive, set the tag explicitly; otherwise a new tag is selected automatically.
    Return the tag of the surface.
    
    Return an integer.
    
    Types:
     - `wireTag`: integer
     - `tag`: integer
     - `type`: string
    """
    function addBezierFilling(wireTag, tag = -1, type = "")
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddBezierFilling, gmsh.lib), Cint,
              (Cint, Cint, Ptr{Cchar}, Ptr{Cint}),
              wireTag, tag, type, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_bezier_filling = addBezierFilling
    
    """
        gmsh.model.occ.addBSplineSurface(pointTags, numPointsU, tag = -1, degreeU = 3, degreeV = 3, weights = Cdouble[], knotsU = Cdouble[], knotsV = Cdouble[], multiplicitiesU = Cint[], multiplicitiesV = Cint[], wireTags = Cint[], wire3D = false)
    
    Add a b-spline surface of degree `degreeU` x `degreeV` in the OpenCASCADE CAD
    representation, with `pointTags` control points given as a single vector [Pu1v1,
    ... Pu`numPointsU`v1, Pu1v2, ...]. If `weights`, `knotsU`, `knotsV`,
    `multiplicitiesU` or `multiplicitiesV` are not provided, default parameters are
    computed automatically. If `tag` is positive, set the tag explicitly; otherwise
    a new tag is selected automatically. If `wireTags` is provided, trim the
    b-spline patch using the provided wires: the first wire defines the external
    contour, the others define holes. If `wire3D` is set, consider wire curves as 3D
    curves and project them on the b-spline surface; otherwise consider the wire
    curves as defined in the parametric space of the surface. Return the tag of the
    b-spline surface.
    
    Return an integer.
    
    Types:
     - `pointTags`: vector of integers
     - `numPointsU`: integer
     - `tag`: integer
     - `degreeU`: integer
     - `degreeV`: integer
     - `weights`: vector of doubles
     - `knotsU`: vector of doubles
     - `knotsV`: vector of doubles
     - `multiplicitiesU`: vector of integers
     - `multiplicitiesV`: vector of integers
     - `wireTags`: vector of integers
     - `wire3D`: boolean
    """
    function addBSplineSurface(pointTags, numPointsU, tag = -1, degreeU = 3, degreeV = 3, weights = Cdouble[], knotsU = Cdouble[], knotsV = Cdouble[], multiplicitiesU = Cint[], multiplicitiesV = Cint[], wireTags = Cint[], wire3D = false)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddBSplineSurface, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Cint, Cint, Cint, Ptr{Cdouble}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Cint}, Csize_t, Ptr{Cint}, Csize_t, Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              convert(Vector{Cint}, pointTags), length(pointTags), numPointsU, tag, degreeU, degreeV, convert(Vector{Cdouble}, weights), length(weights), convert(Vector{Cdouble}, knotsU), length(knotsU), convert(Vector{Cdouble}, knotsV), length(knotsV), convert(Vector{Cint}, multiplicitiesU), length(multiplicitiesU), convert(Vector{Cint}, multiplicitiesV), length(multiplicitiesV), convert(Vector{Cint}, wireTags), length(wireTags), wire3D, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_bspline_surface = addBSplineSurface
    
    """
        gmsh.model.occ.addBezierSurface(pointTags, numPointsU, tag = -1, wireTags = Cint[], wire3D = false)
    
    Add a Bezier surface in the OpenCASCADE CAD representation, with `pointTags`
    control points given as a single vector [Pu1v1, ... Pu`numPointsU`v1, Pu1v2,
    ...]. If `tag` is positive, set the tag explicitly; otherwise a new tag is
    selected automatically. If `wireTags` is provided, trim the Bezier patch using
    the provided wires: the first wire defines the external contour, the others
    define holes. If `wire3D` is set, consider wire curves as 3D curves and project
    them on the Bezier surface; otherwise consider the wire curves as defined in the
    parametric space of the surface. Return the tag of the Bezier surface.
    
    Return an integer.
    
    Types:
     - `pointTags`: vector of integers
     - `numPointsU`: integer
     - `tag`: integer
     - `wireTags`: vector of integers
     - `wire3D`: boolean
    """
    function addBezierSurface(pointTags, numPointsU, tag = -1, wireTags = Cint[], wire3D = false)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddBezierSurface, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Cint, Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              convert(Vector{Cint}, pointTags), length(pointTags), numPointsU, tag, convert(Vector{Cint}, wireTags), length(wireTags), wire3D, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_bezier_surface = addBezierSurface
    
    """
        gmsh.model.occ.addTrimmedSurface(surfaceTag, wireTags = Cint[], wire3D = false, tag = -1)
    
    Trim the surface `surfaceTag` with the wires `wireTags`, replacing any existing
    trimming curves. The first wire defines the external contour, the others define
    holes. If `wire3D` is set, consider wire curves as 3D curves and project them on
    the surface; otherwise consider the wire curves as defined in the parametric
    space of the surface. If `tag` is positive, set the tag explicitly; otherwise a
    new tag is selected automatically. Return the tag of the trimmed surface.
    
    Return an integer.
    
    Types:
     - `surfaceTag`: integer
     - `wireTags`: vector of integers
     - `wire3D`: boolean
     - `tag`: integer
    """
    function addTrimmedSurface(surfaceTag, wireTags = Cint[], wire3D = false, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddTrimmedSurface, gmsh.lib), Cint,
              (Cint, Ptr{Cint}, Csize_t, Cint, Cint, Ptr{Cint}),
              surfaceTag, convert(Vector{Cint}, wireTags), length(wireTags), wire3D, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_trimmed_surface = addTrimmedSurface
    
    """
        gmsh.model.occ.addSurfaceLoop(surfaceTags, tag = -1, sewing = false)
    
    Add a surface loop (a closed shell) in the OpenCASCADE CAD representation,
    formed by `surfaceTags`.  If `tag` is positive, set the tag explicitly;
    otherwise a new tag is selected automatically. Return the tag of the surface
    loop. Setting `sewing` allows one to build a shell made of surfaces that share
    geometrically identical (but topologically different) curves.
    
    Return an integer.
    
    Types:
     - `surfaceTags`: vector of integers
     - `tag`: integer
     - `sewing`: boolean
    """
    function addSurfaceLoop(surfaceTags, tag = -1, sewing = false)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddSurfaceLoop, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Cint, Ptr{Cint}),
              convert(Vector{Cint}, surfaceTags), length(surfaceTags), tag, sewing, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_surface_loop = addSurfaceLoop
    
    """
        gmsh.model.occ.addVolume(shellTags, tag = -1)
    
    Add a volume (a region) in the OpenCASCADE CAD representation, defined by one or
    more surface loops `shellTags`. The first surface loop defines the exterior
    boundary; additional surface loop define holes. If `tag` is positive, set the
    tag explicitly; otherwise a new tag is selected automatically. Return the tag of
    the volume.
    
    Return an integer.
    
    Types:
     - `shellTags`: vector of integers
     - `tag`: integer
    """
    function addVolume(shellTags, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddVolume, gmsh.lib), Cint,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              convert(Vector{Cint}, shellTags), length(shellTags), tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_volume = addVolume
    
    """
        gmsh.model.occ.addSphere(xc, yc, zc, radius, tag = -1, angle1 = -pi/2, angle2 = pi/2, angle3 = 2*pi)
    
    Add a sphere of center (`xc`, `yc`, `zc`) and radius `r` in the OpenCASCADE CAD
    representation. The optional `angle1` and `angle2` arguments define the polar
    angle opening (from -Pi/2 to Pi/2). The optional `angle3` argument defines the
    azimuthal opening (from 0 to 2*Pi). If `tag` is positive, set the tag
    explicitly; otherwise a new tag is selected automatically. Return the tag of the
    sphere.
    
    Return an integer.
    
    Types:
     - `xc`: double
     - `yc`: double
     - `zc`: double
     - `radius`: double
     - `tag`: integer
     - `angle1`: double
     - `angle2`: double
     - `angle3`: double
    """
    function addSphere(xc, yc, zc, radius, tag = -1, angle1 = -pi/2, angle2 = pi/2, angle3 = 2*pi)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddSphere, gmsh.lib), Cint,
              (Cdouble, Cdouble, Cdouble, Cdouble, Cint, Cdouble, Cdouble, Cdouble, Ptr{Cint}),
              xc, yc, zc, radius, tag, angle1, angle2, angle3, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_sphere = addSphere
    
    """
        gmsh.model.occ.addBox(x, y, z, dx, dy, dz, tag = -1)
    
    Add a parallelepipedic box in the OpenCASCADE CAD representation, defined by a
    point (`x`, `y`, `z`) and the extents along the x-, y- and z-axes. If `tag` is
    positive, set the tag explicitly; otherwise a new tag is selected automatically.
    Return the tag of the box.
    
    Return an integer.
    
    Types:
     - `x`: double
     - `y`: double
     - `z`: double
     - `dx`: double
     - `dy`: double
     - `dz`: double
     - `tag`: integer
    """
    function addBox(x, y, z, dx, dy, dz, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddBox, gmsh.lib), Cint,
              (Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cint, Ptr{Cint}),
              x, y, z, dx, dy, dz, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_box = addBox
    
    """
        gmsh.model.occ.addCylinder(x, y, z, dx, dy, dz, r, tag = -1, angle = 2*pi)
    
    Add a cylinder in the OpenCASCADE CAD representation, defined by the center
    (`x`, `y`, `z`) of its first circular face, the 3 components (`dx`, `dy`, `dz`)
    of the vector defining its axis and its radius `r`. The optional `angle`
    argument defines the angular opening (from 0 to 2*Pi). If `tag` is positive, set
    the tag explicitly; otherwise a new tag is selected automatically. Return the
    tag of the cylinder.
    
    Return an integer.
    
    Types:
     - `x`: double
     - `y`: double
     - `z`: double
     - `dx`: double
     - `dy`: double
     - `dz`: double
     - `r`: double
     - `tag`: integer
     - `angle`: double
    """
    function addCylinder(x, y, z, dx, dy, dz, r, tag = -1, angle = 2*pi)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddCylinder, gmsh.lib), Cint,
              (Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cint, Cdouble, Ptr{Cint}),
              x, y, z, dx, dy, dz, r, tag, angle, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_cylinder = addCylinder
    
    """
        gmsh.model.occ.addCone(x, y, z, dx, dy, dz, r1, r2, tag = -1, angle = 2*pi)
    
    Add a cone in the OpenCASCADE CAD representation, defined by the center (`x`,
    `y`, `z`) of its first circular face, the 3 components of the vector (`dx`,
    `dy`, `dz`) defining its axis and the two radii `r1` and `r2` of the faces
    (these radii can be zero). If `tag` is positive, set the tag explicitly;
    otherwise a new tag is selected automatically. `angle` defines the optional
    angular opening (from 0 to 2*Pi). Return the tag of the cone.
    
    Return an integer.
    
    Types:
     - `x`: double
     - `y`: double
     - `z`: double
     - `dx`: double
     - `dy`: double
     - `dz`: double
     - `r1`: double
     - `r2`: double
     - `tag`: integer
     - `angle`: double
    """
    function addCone(x, y, z, dx, dy, dz, r1, r2, tag = -1, angle = 2*pi)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddCone, gmsh.lib), Cint,
              (Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cint, Cdouble, Ptr{Cint}),
              x, y, z, dx, dy, dz, r1, r2, tag, angle, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_cone = addCone
    
    """
        gmsh.model.occ.addWedge(x, y, z, dx, dy, dz, tag = -1, ltx = 0., zAxis = Cdouble[])
    
    Add a right angular wedge in the OpenCASCADE CAD representation, defined by the
    right-angle point (`x`, `y`, `z`) and the 3 extends along the x-, y- and z-axes
    (`dx`, `dy`, `dz`). If `tag` is positive, set the tag explicitly; otherwise a
    new tag is selected automatically. The optional argument `ltx` defines the top
    extent along the x-axis. If a vector `zAxis` of size 3 is provided, use it to
    define the z-axis. Return the tag of the wedge.
    
    Return an integer.
    
    Types:
     - `x`: double
     - `y`: double
     - `z`: double
     - `dx`: double
     - `dy`: double
     - `dz`: double
     - `tag`: integer
     - `ltx`: double
     - `zAxis`: vector of doubles
    """
    function addWedge(x, y, z, dx, dy, dz, tag = -1, ltx = 0., zAxis = Cdouble[])
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddWedge, gmsh.lib), Cint,
              (Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cint, Cdouble, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              x, y, z, dx, dy, dz, tag, ltx, convert(Vector{Cdouble}, zAxis), length(zAxis), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_wedge = addWedge
    
    """
        gmsh.model.occ.addTorus(x, y, z, r1, r2, tag = -1, angle = 2*pi, zAxis = Cdouble[])
    
    Add a torus in the OpenCASCADE CAD representation, defined by its center (`x`,
    `y`, `z`) and its 2 radii `r` and `r2`. If `tag` is positive, set the tag
    explicitly; otherwise a new tag is selected automatically. The optional argument
    `angle` defines the angular opening (from 0 to 2*Pi). If a vector `zAxis` of
    size 3 is provided, use it to define the z-axis. Return the tag of the torus.
    
    Return an integer.
    
    Types:
     - `x`: double
     - `y`: double
     - `z`: double
     - `r1`: double
     - `r2`: double
     - `tag`: integer
     - `angle`: double
     - `zAxis`: vector of doubles
    """
    function addTorus(x, y, z, r1, r2, tag = -1, angle = 2*pi, zAxis = Cdouble[])
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccAddTorus, gmsh.lib), Cint,
              (Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cint, Cdouble, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              x, y, z, r1, r2, tag, angle, convert(Vector{Cdouble}, zAxis), length(zAxis), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_torus = addTorus
    
    """
        gmsh.model.occ.addThruSections(wireTags, tag = -1, makeSolid = true, makeRuled = false, maxDegree = -1, continuity = "", parametrization = "", smoothing = false)
    
    Add a volume (if the optional argument `makeSolid` is set) or surfaces in the
    OpenCASCADE CAD representation, defined through the open or closed wires
    `wireTags`. If `tag` is positive, set the tag explicitly; otherwise a new tag is
    selected automatically. The new entities are returned in `outDimTags` as a
    vector of (dim, tag) pairs. If the optional argument `makeRuled` is set, the
    surfaces created on the boundary are forced to be ruled surfaces. If `maxDegree`
    is positive, set the maximal degree of resulting surface. The optional argument
    `continuity` allows to specify the continuity of the resulting shape ("C0",
    "G1", "C1", "G2", "C2", "C3", "CN"). The optional argument `parametrization`
    sets the parametrization type ("ChordLength", "Centripetal", "IsoParametric").
    The optional argument `smoothing` determines if smoothing is applied.
    
    Return `outDimTags`.
    
    Types:
     - `wireTags`: vector of integers
     - `outDimTags`: vector of pairs of integers
     - `tag`: integer
     - `makeSolid`: boolean
     - `makeRuled`: boolean
     - `maxDegree`: integer
     - `continuity`: string
     - `parametrization`: string
     - `smoothing`: boolean
    """
    function addThruSections(wireTags, tag = -1, makeSolid = true, makeRuled = false, maxDegree = -1, continuity = "", parametrization = "", smoothing = false)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccAddThruSections, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Cint, Cint, Cint, Cint, Ptr{Cchar}, Ptr{Cchar}, Cint, Ptr{Cint}),
              convert(Vector{Cint}, wireTags), length(wireTags), api_outDimTags_, api_outDimTags_n_, tag, makeSolid, makeRuled, maxDegree, continuity, parametrization, smoothing, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    const add_thru_sections = addThruSections
    
    """
        gmsh.model.occ.addThickSolid(volumeTag, excludeSurfaceTags, offset, tag = -1)
    
    Add a hollowed volume in the OpenCASCADE CAD representation, built from an
    initial volume `volumeTag` and a set of faces from this volume
    `excludeSurfaceTags`, which are to be removed. The remaining faces of the volume
    become the walls of the hollowed solid, with thickness `offset`. If `tag` is
    positive, set the tag explicitly; otherwise a new tag is selected automatically.
    
    Return `outDimTags`.
    
    Types:
     - `volumeTag`: integer
     - `excludeSurfaceTags`: vector of integers
     - `offset`: double
     - `outDimTags`: vector of pairs of integers
     - `tag`: integer
    """
    function addThickSolid(volumeTag, excludeSurfaceTags, offset, tag = -1)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccAddThickSolid, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}, Csize_t, Cdouble, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Cint, Ptr{Cint}),
              volumeTag, convert(Vector{Cint}, excludeSurfaceTags), length(excludeSurfaceTags), offset, api_outDimTags_, api_outDimTags_n_, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    const add_thick_solid = addThickSolid
    
    """
        gmsh.model.occ.extrude(dimTags, dx, dy, dz, numElements = Cint[], heights = Cdouble[], recombine = false)
    
    Extrude the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    OpenCASCADE CAD representation, using a translation along (`dx`, `dy`, `dz`).
    Return extruded entities in `outDimTags`. If the `numElements` vector is not
    empty, also extrude the mesh: the entries in `numElements` give the number of
    elements in each layer. If the `height` vector is not empty, it provides the
    (cumulative) height of the different layers, normalized to 1. If `recombine` is
    set, recombine the mesh in the layers.
    
    Return `outDimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `dx`: double
     - `dy`: double
     - `dz`: double
     - `outDimTags`: vector of pairs of integers
     - `numElements`: vector of integers
     - `heights`: vector of doubles
     - `recombine`: boolean
    """
    function extrude(dimTags, dx, dy, dz, numElements = Cint[], heights = Cdouble[], recombine = false)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccExtrude, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cdouble, Cdouble, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}, Csize_t, Ptr{Cdouble}, Csize_t, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, dx, dy, dz, api_outDimTags_, api_outDimTags_n_, convert(Vector{Cint}, numElements), length(numElements), convert(Vector{Cdouble}, heights), length(heights), recombine, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    
    """
        gmsh.model.occ.revolve(dimTags, x, y, z, ax, ay, az, angle, numElements = Cint[], heights = Cdouble[], recombine = false)
    
    Extrude the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    OpenCASCADE CAD representation, using a rotation of `angle` radians around the
    axis of revolution defined by the point (`x`, `y`, `z`) and the direction (`ax`,
    `ay`, `az`). Return extruded entities in `outDimTags`. If the `numElements`
    vector is not empty, also extrude the mesh: the entries in `numElements` give
    the number of elements in each layer. If the `height` vector is not empty, it
    provides the (cumulative) height of the different layers, normalized to 1. When
    the mesh is extruded the angle should be strictly smaller than 2*Pi. If
    `recombine` is set, recombine the mesh in the layers.
    
    Return `outDimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `x`: double
     - `y`: double
     - `z`: double
     - `ax`: double
     - `ay`: double
     - `az`: double
     - `angle`: double
     - `outDimTags`: vector of pairs of integers
     - `numElements`: vector of integers
     - `heights`: vector of doubles
     - `recombine`: boolean
    """
    function revolve(dimTags, x, y, z, ax, ay, az, angle, numElements = Cint[], heights = Cdouble[], recombine = false)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccRevolve, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}, Csize_t, Ptr{Cdouble}, Csize_t, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, x, y, z, ax, ay, az, angle, api_outDimTags_, api_outDimTags_n_, convert(Vector{Cint}, numElements), length(numElements), convert(Vector{Cdouble}, heights), length(heights), recombine, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    
    """
        gmsh.model.occ.addPipe(dimTags, wireTag, trihedron = "")
    
    Add a pipe in the OpenCASCADE CAD representation, by extruding the entities
    `dimTags` (given as a vector of (dim, tag) pairs) along the wire `wireTag`. The
    type of sweep can be specified with `trihedron` (possible values:
    "DiscreteTrihedron", "CorrectedFrenet", "Fixed", "Frenet", "ConstantNormal",
    "Darboux", "GuideAC", "GuidePlan", "GuideACWithContact",
    "GuidePlanWithContact"). If `trihedron` is not provided, "DiscreteTrihedron" is
    assumed. Return the pipe in `outDimTags`.
    
    Return `outDimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `wireTag`: integer
     - `outDimTags`: vector of pairs of integers
     - `trihedron`: string
    """
    function addPipe(dimTags, wireTag, trihedron = "")
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccAddPipe, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cchar}, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, wireTag, api_outDimTags_, api_outDimTags_n_, trihedron, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    const add_pipe = addPipe
    
    """
        gmsh.model.occ.fillet(volumeTags, curveTags, radii, removeVolume = true)
    
    Fillet the volumes `volumeTags` on the curves `curveTags` with radii `radii`.
    The `radii` vector can either contain a single radius, as many radii as
    `curveTags`, or twice as many as `curveTags` (in which case different radii are
    provided for the begin and end points of the curves). Return the filleted
    entities in `outDimTags` as a vector of (dim, tag) pairs. Remove the original
    volume if `removeVolume` is set.
    
    Return `outDimTags`.
    
    Types:
     - `volumeTags`: vector of integers
     - `curveTags`: vector of integers
     - `radii`: vector of doubles
     - `outDimTags`: vector of pairs of integers
     - `removeVolume`: boolean
    """
    function fillet(volumeTags, curveTags, radii, removeVolume = true)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccFillet, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Cint, Ptr{Cint}),
              convert(Vector{Cint}, volumeTags), length(volumeTags), convert(Vector{Cint}, curveTags), length(curveTags), convert(Vector{Cdouble}, radii), length(radii), api_outDimTags_, api_outDimTags_n_, removeVolume, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    
    """
        gmsh.model.occ.chamfer(volumeTags, curveTags, surfaceTags, distances, removeVolume = true)
    
    Chamfer the volumes `volumeTags` on the curves `curveTags` with distances
    `distances` measured on surfaces `surfaceTags`. The `distances` vector can
    either contain a single distance, as many distances as `curveTags` and
    `surfaceTags`, or twice as many as `curveTags` and `surfaceTags` (in which case
    the first in each pair is measured on the corresponding surface in
    `surfaceTags`, the other on the other adjacent surface). Return the chamfered
    entities in `outDimTags`. Remove the original volume if `removeVolume` is set.
    
    Return `outDimTags`.
    
    Types:
     - `volumeTags`: vector of integers
     - `curveTags`: vector of integers
     - `surfaceTags`: vector of integers
     - `distances`: vector of doubles
     - `outDimTags`: vector of pairs of integers
     - `removeVolume`: boolean
    """
    function chamfer(volumeTags, curveTags, surfaceTags, distances, removeVolume = true)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccChamfer, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}, Csize_t, Ptr{Cint}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Cint, Ptr{Cint}),
              convert(Vector{Cint}, volumeTags), length(volumeTags), convert(Vector{Cint}, curveTags), length(curveTags), convert(Vector{Cint}, surfaceTags), length(surfaceTags), convert(Vector{Cdouble}, distances), length(distances), api_outDimTags_, api_outDimTags_n_, removeVolume, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    
    """
        gmsh.model.occ.fuse(objectDimTags, toolDimTags, tag = -1, removeObject = true, removeTool = true)
    
    Compute the boolean union (the fusion) of the entities `objectDimTags` and
    `toolDimTags` (vectors of (dim, tag) pairs) in the OpenCASCADE CAD
    representation. Return the resulting entities in `outDimTags`. If `tag` is
    positive, try to set the tag explicitly (only valid if the boolean operation
    results in a single entity). Remove the object if `removeObject` is set. Remove
    the tool if `removeTool` is set.
    
    Return `outDimTags`, `outDimTagsMap`.
    
    Types:
     - `objectDimTags`: vector of pairs of integers
     - `toolDimTags`: vector of pairs of integers
     - `outDimTags`: vector of pairs of integers
     - `outDimTagsMap`: vector of vectors of pairs of integers
     - `tag`: integer
     - `removeObject`: boolean
     - `removeTool`: boolean
    """
    function fuse(objectDimTags, toolDimTags, tag = -1, removeObject = true, removeTool = true)
        api_objectDimTags_ = collect(Cint, Iterators.flatten(objectDimTags))
        api_objectDimTags_n_ = length(api_objectDimTags_)
        api_toolDimTags_ = collect(Cint, Iterators.flatten(toolDimTags))
        api_toolDimTags_n_ = length(api_toolDimTags_)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        api_outDimTagsMap_ = Ref{Ptr{Ptr{Cint}}}()
        api_outDimTagsMap_n_ = Ref{Ptr{Csize_t}}()
        api_outDimTagsMap_nn_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccFuse, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}, Csize_t, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Ptr{Ptr{Cint}}}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Cint, Cint, Cint, Ptr{Cint}),
              api_objectDimTags_, api_objectDimTags_n_, api_toolDimTags_, api_toolDimTags_n_, api_outDimTags_, api_outDimTags_n_, api_outDimTagsMap_, api_outDimTagsMap_n_, api_outDimTagsMap_nn_, tag, removeObject, removeTool, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        tmp_api_outDimTagsMap_ = unsafe_wrap(Array, api_outDimTagsMap_[], api_outDimTagsMap_nn_[], own = true)
        tmp_api_outDimTagsMap_n_ = unsafe_wrap(Array, api_outDimTagsMap_n_[], api_outDimTagsMap_nn_[], own = true)
        outDimTagsMap = Vector{Tuple{Cint,Cint}}[]
        resize!(outDimTagsMap, api_outDimTagsMap_nn_[])
        for i in 1:api_outDimTagsMap_nn_[]
            tmp = unsafe_wrap(Array, tmp_api_outDimTagsMap_[i], tmp_api_outDimTagsMap_n_[i], own = true)
            outDimTagsMap[i] = [(tmp[i], tmp[i+1]) for i in 1:2:length(tmp)]
        end
        return outDimTags, outDimTagsMap
    end
    
    """
        gmsh.model.occ.intersect(objectDimTags, toolDimTags, tag = -1, removeObject = true, removeTool = true)
    
    Compute the boolean intersection (the common parts) of the entities
    `objectDimTags` and `toolDimTags` (vectors of (dim, tag) pairs) in the
    OpenCASCADE CAD representation. Return the resulting entities in `outDimTags`.
    If `tag` is positive, try to set the tag explicitly (only valid if the boolean
    operation results in a single entity). Remove the object if `removeObject` is
    set. Remove the tool if `removeTool` is set.
    
    Return `outDimTags`, `outDimTagsMap`.
    
    Types:
     - `objectDimTags`: vector of pairs of integers
     - `toolDimTags`: vector of pairs of integers
     - `outDimTags`: vector of pairs of integers
     - `outDimTagsMap`: vector of vectors of pairs of integers
     - `tag`: integer
     - `removeObject`: boolean
     - `removeTool`: boolean
    """
    function intersect(objectDimTags, toolDimTags, tag = -1, removeObject = true, removeTool = true)
        api_objectDimTags_ = collect(Cint, Iterators.flatten(objectDimTags))
        api_objectDimTags_n_ = length(api_objectDimTags_)
        api_toolDimTags_ = collect(Cint, Iterators.flatten(toolDimTags))
        api_toolDimTags_n_ = length(api_toolDimTags_)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        api_outDimTagsMap_ = Ref{Ptr{Ptr{Cint}}}()
        api_outDimTagsMap_n_ = Ref{Ptr{Csize_t}}()
        api_outDimTagsMap_nn_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccIntersect, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}, Csize_t, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Ptr{Ptr{Cint}}}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Cint, Cint, Cint, Ptr{Cint}),
              api_objectDimTags_, api_objectDimTags_n_, api_toolDimTags_, api_toolDimTags_n_, api_outDimTags_, api_outDimTags_n_, api_outDimTagsMap_, api_outDimTagsMap_n_, api_outDimTagsMap_nn_, tag, removeObject, removeTool, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        tmp_api_outDimTagsMap_ = unsafe_wrap(Array, api_outDimTagsMap_[], api_outDimTagsMap_nn_[], own = true)
        tmp_api_outDimTagsMap_n_ = unsafe_wrap(Array, api_outDimTagsMap_n_[], api_outDimTagsMap_nn_[], own = true)
        outDimTagsMap = Vector{Tuple{Cint,Cint}}[]
        resize!(outDimTagsMap, api_outDimTagsMap_nn_[])
        for i in 1:api_outDimTagsMap_nn_[]
            tmp = unsafe_wrap(Array, tmp_api_outDimTagsMap_[i], tmp_api_outDimTagsMap_n_[i], own = true)
            outDimTagsMap[i] = [(tmp[i], tmp[i+1]) for i in 1:2:length(tmp)]
        end
        return outDimTags, outDimTagsMap
    end
    
    """
        gmsh.model.occ.cut(objectDimTags, toolDimTags, tag = -1, removeObject = true, removeTool = true)
    
    Compute the boolean difference between the entities `objectDimTags` and
    `toolDimTags` (given as vectors of (dim, tag) pairs) in the OpenCASCADE CAD
    representation. Return the resulting entities in `outDimTags`. If `tag` is
    positive, try to set the tag explicitly (only valid if the boolean operation
    results in a single entity). Remove the object if `removeObject` is set. Remove
    the tool if `removeTool` is set.
    
    Return `outDimTags`, `outDimTagsMap`.
    
    Types:
     - `objectDimTags`: vector of pairs of integers
     - `toolDimTags`: vector of pairs of integers
     - `outDimTags`: vector of pairs of integers
     - `outDimTagsMap`: vector of vectors of pairs of integers
     - `tag`: integer
     - `removeObject`: boolean
     - `removeTool`: boolean
    """
    function cut(objectDimTags, toolDimTags, tag = -1, removeObject = true, removeTool = true)
        api_objectDimTags_ = collect(Cint, Iterators.flatten(objectDimTags))
        api_objectDimTags_n_ = length(api_objectDimTags_)
        api_toolDimTags_ = collect(Cint, Iterators.flatten(toolDimTags))
        api_toolDimTags_n_ = length(api_toolDimTags_)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        api_outDimTagsMap_ = Ref{Ptr{Ptr{Cint}}}()
        api_outDimTagsMap_n_ = Ref{Ptr{Csize_t}}()
        api_outDimTagsMap_nn_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccCut, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}, Csize_t, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Ptr{Ptr{Cint}}}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Cint, Cint, Cint, Ptr{Cint}),
              api_objectDimTags_, api_objectDimTags_n_, api_toolDimTags_, api_toolDimTags_n_, api_outDimTags_, api_outDimTags_n_, api_outDimTagsMap_, api_outDimTagsMap_n_, api_outDimTagsMap_nn_, tag, removeObject, removeTool, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        tmp_api_outDimTagsMap_ = unsafe_wrap(Array, api_outDimTagsMap_[], api_outDimTagsMap_nn_[], own = true)
        tmp_api_outDimTagsMap_n_ = unsafe_wrap(Array, api_outDimTagsMap_n_[], api_outDimTagsMap_nn_[], own = true)
        outDimTagsMap = Vector{Tuple{Cint,Cint}}[]
        resize!(outDimTagsMap, api_outDimTagsMap_nn_[])
        for i in 1:api_outDimTagsMap_nn_[]
            tmp = unsafe_wrap(Array, tmp_api_outDimTagsMap_[i], tmp_api_outDimTagsMap_n_[i], own = true)
            outDimTagsMap[i] = [(tmp[i], tmp[i+1]) for i in 1:2:length(tmp)]
        end
        return outDimTags, outDimTagsMap
    end
    
    """
        gmsh.model.occ.fragment(objectDimTags, toolDimTags, tag = -1, removeObject = true, removeTool = true)
    
    Compute the boolean fragments (general fuse) resulting from the intersection of
    the entities `objectDimTags` and `toolDimTags` (given as vectors of (dim, tag)
    pairs) in the OpenCASCADE CAD representation, making all iterfaces conformal.
    When applied to entities of different dimensions, the lower dimensional entities
    will be automatically embedded in the higher dimensional entities if they are
    not on their boundary. Return the resulting entities in `outDimTags`. If `tag`
    is positive, try to set the tag explicitly (only valid if the boolean operation
    results in a single entity). Remove the object if `removeObject` is set. Remove
    the tool if `removeTool` is set.
    
    Return `outDimTags`, `outDimTagsMap`.
    
    Types:
     - `objectDimTags`: vector of pairs of integers
     - `toolDimTags`: vector of pairs of integers
     - `outDimTags`: vector of pairs of integers
     - `outDimTagsMap`: vector of vectors of pairs of integers
     - `tag`: integer
     - `removeObject`: boolean
     - `removeTool`: boolean
    """
    function fragment(objectDimTags, toolDimTags, tag = -1, removeObject = true, removeTool = true)
        api_objectDimTags_ = collect(Cint, Iterators.flatten(objectDimTags))
        api_objectDimTags_n_ = length(api_objectDimTags_)
        api_toolDimTags_ = collect(Cint, Iterators.flatten(toolDimTags))
        api_toolDimTags_n_ = length(api_toolDimTags_)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        api_outDimTagsMap_ = Ref{Ptr{Ptr{Cint}}}()
        api_outDimTagsMap_n_ = Ref{Ptr{Csize_t}}()
        api_outDimTagsMap_nn_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccFragment, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}, Csize_t, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Ptr{Ptr{Cint}}}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Cint, Cint, Cint, Ptr{Cint}),
              api_objectDimTags_, api_objectDimTags_n_, api_toolDimTags_, api_toolDimTags_n_, api_outDimTags_, api_outDimTags_n_, api_outDimTagsMap_, api_outDimTagsMap_n_, api_outDimTagsMap_nn_, tag, removeObject, removeTool, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        tmp_api_outDimTagsMap_ = unsafe_wrap(Array, api_outDimTagsMap_[], api_outDimTagsMap_nn_[], own = true)
        tmp_api_outDimTagsMap_n_ = unsafe_wrap(Array, api_outDimTagsMap_n_[], api_outDimTagsMap_nn_[], own = true)
        outDimTagsMap = Vector{Tuple{Cint,Cint}}[]
        resize!(outDimTagsMap, api_outDimTagsMap_nn_[])
        for i in 1:api_outDimTagsMap_nn_[]
            tmp = unsafe_wrap(Array, tmp_api_outDimTagsMap_[i], tmp_api_outDimTagsMap_n_[i], own = true)
            outDimTagsMap[i] = [(tmp[i], tmp[i+1]) for i in 1:2:length(tmp)]
        end
        return outDimTags, outDimTagsMap
    end
    
    """
        gmsh.model.occ.translate(dimTags, dx, dy, dz)
    
    Translate the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    OpenCASCADE CAD representation along (`dx`, `dy`, `dz`).
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `dx`: double
     - `dy`: double
     - `dz`: double
    """
    function translate(dimTags, dx, dy, dz)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelOccTranslate, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cdouble, Cdouble, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, dx, dy, dz, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.occ.rotate(dimTags, x, y, z, ax, ay, az, angle)
    
    Rotate the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    OpenCASCADE CAD representation by `angle` radians around the axis of revolution
    defined by the point (`x`, `y`, `z`) and the direction (`ax`, `ay`, `az`).
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `x`: double
     - `y`: double
     - `z`: double
     - `ax`: double
     - `ay`: double
     - `az`: double
     - `angle`: double
    """
    function rotate(dimTags, x, y, z, ax, ay, az, angle)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelOccRotate, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, x, y, z, ax, ay, az, angle, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.occ.dilate(dimTags, x, y, z, a, b, c)
    
    Scale the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    OpenCASCADE CAD representation by factors `a`, `b` and `c` along the three
    coordinate axes; use (`x`, `y`, `z`) as the center of the homothetic
    transformation.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `x`: double
     - `y`: double
     - `z`: double
     - `a`: double
     - `b`: double
     - `c`: double
    """
    function dilate(dimTags, x, y, z, a, b, c)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelOccDilate, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, x, y, z, a, b, c, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.occ.mirror(dimTags, a, b, c, d)
    
    Mirror the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    OpenCASCADE CAD representation, with respect to the plane of equation `a` * x +
    `b` * y + `c` * z + `d` = 0.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `a`: double
     - `b`: double
     - `c`: double
     - `d`: double
    """
    function mirror(dimTags, a, b, c, d)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelOccMirror, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cdouble, Cdouble, Cdouble, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, a, b, c, d, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.occ.symmetrize(dimTags, a, b, c, d)
    
    Mirror the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    OpenCASCADE CAD representation, with respect to the plane of equation `a` * x +
    `b` * y + `c` * z + `d` = 0. (This is a deprecated synonym for `mirror`.)
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `a`: double
     - `b`: double
     - `c`: double
     - `d`: double
    """
    function symmetrize(dimTags, a, b, c, d)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelOccSymmetrize, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Cdouble, Cdouble, Cdouble, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, a, b, c, d, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.occ.affineTransform(dimTags, affineTransform)
    
    Apply a general affine transformation matrix `affineTransform` (16 entries of a
    4x4 matrix, by row; only the 12 first can be provided for convenience) to the
    entities `dimTags` (given as a vector of (dim, tag) pairs) in the OpenCASCADE
    CAD representation.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `affineTransform`: vector of doubles
    """
    function affineTransform(dimTags, affineTransform)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelOccAffineTransform, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, convert(Vector{Cdouble}, affineTransform), length(affineTransform), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const affine_transform = affineTransform
    
    """
        gmsh.model.occ.copy(dimTags)
    
    Copy the entities `dimTags` in the OpenCASCADE CAD representation; the new
    entities are returned in `outDimTags`.
    
    Return `outDimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `outDimTags`: vector of pairs of integers
    """
    function copy(dimTags)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccCopy, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, api_outDimTags_, api_outDimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    
    """
        gmsh.model.occ.remove(dimTags, recursive = false)
    
    Remove the entities `dimTags` (given as a vector of (dim, tag) pairs) in the
    OpenCASCADE CAD representation, provided that they are not on the boundary of
    higher-dimensional entities. If `recursive` is true, remove all the entities on
    their boundaries, down to dimension 0.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `recursive`: boolean
    """
    function remove(dimTags, recursive = false)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelOccRemove, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, recursive, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.model.occ.removeAllDuplicates()
    
    Remove all duplicate entities in the OpenCASCADE CAD representation (different
    entities at the same geometrical location) after intersecting (using boolean
    fragments) all highest dimensional entities.
    """
    function removeAllDuplicates()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccRemoveAllDuplicates, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const remove_all_duplicates = removeAllDuplicates
    
    """
        gmsh.model.occ.healShapes(dimTags = Tuple{Cint,Cint}[], tolerance = 1e-8, fixDegenerated = true, fixSmallEdges = true, fixSmallFaces = true, sewFaces = true, makeSolids = true)
    
    Apply various healing procedures to the entities `dimTags` (given as a vector of
    (dim, tag) pairs), or to all the entities in the model if `dimTags` is empty, in
    the OpenCASCADE CAD representation. Return the healed entities in `outDimTags`.
    
    Return `outDimTags`.
    
    Types:
     - `outDimTags`: vector of pairs of integers
     - `dimTags`: vector of pairs of integers
     - `tolerance`: double
     - `fixDegenerated`: boolean
     - `fixSmallEdges`: boolean
     - `fixSmallFaces`: boolean
     - `sewFaces`: boolean
     - `makeSolids`: boolean
    """
    function healShapes(dimTags = Tuple{Cint,Cint}[], tolerance = 1e-8, fixDegenerated = true, fixSmallEdges = true, fixSmallFaces = true, sewFaces = true, makeSolids = true)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelOccHealShapes, gmsh.lib), Cvoid,
              (Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}, Csize_t, Cdouble, Cint, Cint, Cint, Cint, Cint, Ptr{Cint}),
              api_outDimTags_, api_outDimTags_n_, api_dimTags_, api_dimTags_n_, tolerance, fixDegenerated, fixSmallEdges, fixSmallFaces, sewFaces, makeSolids, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    const heal_shapes = healShapes
    
    """
        gmsh.model.occ.convertToNURBS(dimTags)
    
    Convert the entities `dimTags` to NURBS.
    
    Types:
     - `dimTags`: vector of pairs of integers
    """
    function convertToNURBS(dimTags)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelOccConvertToNURBS, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const convert_to_nurbs = convertToNURBS
    
    """
        gmsh.model.occ.importShapes(fileName, highestDimOnly = true, format = "")
    
    Import BREP, STEP or IGES shapes from the file `fileName` in the OpenCASCADE CAD
    representation. The imported entities are returned in `outDimTags`, as a vector
    of (dim, tag) pairs. If the optional argument `highestDimOnly` is set, only
    import the highest dimensional entities in the file. The optional argument
    `format` can be used to force the format of the file (currently "brep", "step"
    or "iges").
    
    Return `outDimTags`.
    
    Types:
     - `fileName`: string
     - `outDimTags`: vector of pairs of integers
     - `highestDimOnly`: boolean
     - `format`: string
    """
    function importShapes(fileName, highestDimOnly = true, format = "")
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccImportShapes, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Cint, Ptr{Cchar}, Ptr{Cint}),
              fileName, api_outDimTags_, api_outDimTags_n_, highestDimOnly, format, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    const import_shapes = importShapes
    
    """
        gmsh.model.occ.importShapesNativePointer(shape, highestDimOnly = true)
    
    Imports an OpenCASCADE `shape` by providing a pointer to a native OpenCASCADE
    `TopoDS_Shape` object (passed as a pointer to void). The imported entities are
    returned in `outDimTags` as a vector of (dim, tag) pairs. If the optional
    argument `highestDimOnly` is set, only import the highest dimensional entities
    in `shape`. In Python, this function can be used for integration with PythonOCC,
    in which the SwigPyObject pointer of `TopoDS_Shape` must be passed as an int to
    `shape`, i.e., `shape = int(pythonocc_shape.this)`. Warning: this function is
    unsafe, as providing an invalid pointer will lead to undefined behavior.
    
    Return `outDimTags`.
    
    Types:
     - `shape`: pointer
     - `outDimTags`: vector of pairs of integers
     - `highestDimOnly`: boolean
    """
    function importShapesNativePointer(shape, highestDimOnly = true)
        api_outDimTags_ = Ref{Ptr{Cint}}()
        api_outDimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccImportShapesNativePointer, gmsh.lib), Cvoid,
              (Ptr{Cvoid}, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Cint, Ptr{Cint}),
              shape, api_outDimTags_, api_outDimTags_n_, highestDimOnly, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_outDimTags_ = unsafe_wrap(Array, api_outDimTags_[], api_outDimTags_n_[], own = true)
        outDimTags = [ (tmp_api_outDimTags_[i], tmp_api_outDimTags_[i+1]) for i in 1:2:length(tmp_api_outDimTags_) ]
        return outDimTags
    end
    const import_shapes_native_pointer = importShapesNativePointer
    
    """
        gmsh.model.occ.getEntities(dim = -1)
    
    Get all the OpenCASCADE entities. If `dim` is >= 0, return only the entities of
    the specified dimension (e.g. points if `dim` == 0). The entities are returned
    as a vector of (dim, tag) pairs.
    
    Return `dimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `dim`: integer
    """
    function getEntities(dim = -1)
        api_dimTags_ = Ref{Ptr{Cint}}()
        api_dimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccGetEntities, gmsh.lib), Cvoid,
              (Ptr{Ptr{Cint}}, Ptr{Csize_t}, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, dim, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_dimTags_ = unsafe_wrap(Array, api_dimTags_[], api_dimTags_n_[], own = true)
        dimTags = [ (tmp_api_dimTags_[i], tmp_api_dimTags_[i+1]) for i in 1:2:length(tmp_api_dimTags_) ]
        return dimTags
    end
    const get_entities = getEntities
    
    """
        gmsh.model.occ.getEntitiesInBoundingBox(xmin, ymin, zmin, xmax, ymax, zmax, dim = -1)
    
    Get the OpenCASCADE entities in the bounding box defined by the two points
    (`xmin`, `ymin`, `zmin`) and (`xmax`, `ymax`, `zmax`). If `dim` is >= 0, return
    only the entities of the specified dimension (e.g. points if `dim` == 0).
    
    Return `dimTags`.
    
    Types:
     - `xmin`: double
     - `ymin`: double
     - `zmin`: double
     - `xmax`: double
     - `ymax`: double
     - `zmax`: double
     - `dimTags`: vector of pairs of integers
     - `dim`: integer
    """
    function getEntitiesInBoundingBox(xmin, ymin, zmin, xmax, ymax, zmax, dim = -1)
        api_dimTags_ = Ref{Ptr{Cint}}()
        api_dimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccGetEntitiesInBoundingBox, gmsh.lib), Cvoid,
              (Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Cdouble, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Cint, Ptr{Cint}),
              xmin, ymin, zmin, xmax, ymax, zmax, api_dimTags_, api_dimTags_n_, dim, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_dimTags_ = unsafe_wrap(Array, api_dimTags_[], api_dimTags_n_[], own = true)
        dimTags = [ (tmp_api_dimTags_[i], tmp_api_dimTags_[i+1]) for i in 1:2:length(tmp_api_dimTags_) ]
        return dimTags
    end
    const get_entities_in_bounding_box = getEntitiesInBoundingBox
    
    """
        gmsh.model.occ.getBoundingBox(dim, tag)
    
    Get the bounding box (`xmin`, `ymin`, `zmin`), (`xmax`, `ymax`, `zmax`) of the
    OpenCASCADE entity of dimension `dim` and tag `tag`.
    
    Return `xmin`, `ymin`, `zmin`, `xmax`, `ymax`, `zmax`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `xmin`: double
     - `ymin`: double
     - `zmin`: double
     - `xmax`: double
     - `ymax`: double
     - `zmax`: double
    """
    function getBoundingBox(dim, tag)
        api_xmin_ = Ref{Cdouble}()
        api_ymin_ = Ref{Cdouble}()
        api_zmin_ = Ref{Cdouble}()
        api_xmax_ = Ref{Cdouble}()
        api_ymax_ = Ref{Cdouble}()
        api_zmax_ = Ref{Cdouble}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccGetBoundingBox, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cdouble}, Ptr{Cdouble}, Ptr{Cdouble}, Ptr{Cdouble}, Ptr{Cdouble}, Ptr{Cdouble}, Ptr{Cint}),
              dim, tag, api_xmin_, api_ymin_, api_zmin_, api_xmax_, api_ymax_, api_zmax_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_xmin_[], api_ymin_[], api_zmin_[], api_xmax_[], api_ymax_[], api_zmax_[]
    end
    const get_bounding_box = getBoundingBox
    
    """
        gmsh.model.occ.getCurveLoops(surfaceTag)
    
    Get the tags `curveLoopTags` of the curve loops making up the surface of tag
    `surfaceTag`, as well as the tags `curveTags` of the curves making up each curve
    loop.
    
    Return `curveLoopTags`, `curveTags`.
    
    Types:
     - `surfaceTag`: integer
     - `curveLoopTags`: vector of integers
     - `curveTags`: vector of vectors of integers
    """
    function getCurveLoops(surfaceTag)
        api_curveLoopTags_ = Ref{Ptr{Cint}}()
        api_curveLoopTags_n_ = Ref{Csize_t}()
        api_curveTags_ = Ref{Ptr{Ptr{Cint}}}()
        api_curveTags_n_ = Ref{Ptr{Csize_t}}()
        api_curveTags_nn_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccGetCurveLoops, gmsh.lib), Cvoid,
              (Cint, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Ptr{Ptr{Cint}}}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Cint}),
              surfaceTag, api_curveLoopTags_, api_curveLoopTags_n_, api_curveTags_, api_curveTags_n_, api_curveTags_nn_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        curveLoopTags = unsafe_wrap(Array, api_curveLoopTags_[], api_curveLoopTags_n_[], own = true)
        tmp_api_curveTags_ = unsafe_wrap(Array, api_curveTags_[], api_curveTags_nn_[], own = true)
        tmp_api_curveTags_n_ = unsafe_wrap(Array, api_curveTags_n_[], api_curveTags_nn_[], own = true)
        curveTags = [ unsafe_wrap(Array, tmp_api_curveTags_[i], tmp_api_curveTags_n_[i], own = true) for i in 1:api_curveTags_nn_[] ]
        return curveLoopTags, curveTags
    end
    const get_curve_loops = getCurveLoops
    
    """
        gmsh.model.occ.getSurfaceLoops(volumeTag)
    
    Get the tags `surfaceLoopTags` of the surface loops making up the volume of tag
    `volumeTag`, as well as the tags `surfaceTags` of the surfaces making up each
    surface loop.
    
    Return `surfaceLoopTags`, `surfaceTags`.
    
    Types:
     - `volumeTag`: integer
     - `surfaceLoopTags`: vector of integers
     - `surfaceTags`: vector of vectors of integers
    """
    function getSurfaceLoops(volumeTag)
        api_surfaceLoopTags_ = Ref{Ptr{Cint}}()
        api_surfaceLoopTags_n_ = Ref{Csize_t}()
        api_surfaceTags_ = Ref{Ptr{Ptr{Cint}}}()
        api_surfaceTags_n_ = Ref{Ptr{Csize_t}}()
        api_surfaceTags_nn_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccGetSurfaceLoops, gmsh.lib), Cvoid,
              (Cint, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Ptr{Ptr{Cint}}}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Cint}),
              volumeTag, api_surfaceLoopTags_, api_surfaceLoopTags_n_, api_surfaceTags_, api_surfaceTags_n_, api_surfaceTags_nn_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        surfaceLoopTags = unsafe_wrap(Array, api_surfaceLoopTags_[], api_surfaceLoopTags_n_[], own = true)
        tmp_api_surfaceTags_ = unsafe_wrap(Array, api_surfaceTags_[], api_surfaceTags_nn_[], own = true)
        tmp_api_surfaceTags_n_ = unsafe_wrap(Array, api_surfaceTags_n_[], api_surfaceTags_nn_[], own = true)
        surfaceTags = [ unsafe_wrap(Array, tmp_api_surfaceTags_[i], tmp_api_surfaceTags_n_[i], own = true) for i in 1:api_surfaceTags_nn_[] ]
        return surfaceLoopTags, surfaceTags
    end
    const get_surface_loops = getSurfaceLoops
    
    """
        gmsh.model.occ.getMass(dim, tag)
    
    Get the mass of the OpenCASCADE entity of dimension `dim` and tag `tag`.
    
    Return `mass`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `mass`: double
    """
    function getMass(dim, tag)
        api_mass_ = Ref{Cdouble}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccGetMass, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cdouble}, Ptr{Cint}),
              dim, tag, api_mass_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_mass_[]
    end
    const get_mass = getMass
    
    """
        gmsh.model.occ.getCenterOfMass(dim, tag)
    
    Get the center of mass of the OpenCASCADE entity of dimension `dim` and tag
    `tag`.
    
    Return `x`, `y`, `z`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `x`: double
     - `y`: double
     - `z`: double
    """
    function getCenterOfMass(dim, tag)
        api_x_ = Ref{Cdouble}()
        api_y_ = Ref{Cdouble}()
        api_z_ = Ref{Cdouble}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccGetCenterOfMass, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cdouble}, Ptr{Cdouble}, Ptr{Cdouble}, Ptr{Cint}),
              dim, tag, api_x_, api_y_, api_z_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_x_[], api_y_[], api_z_[]
    end
    const get_center_of_mass = getCenterOfMass
    
    """
        gmsh.model.occ.getMatrixOfInertia(dim, tag)
    
    Get the matrix of inertia (by row) of the OpenCASCADE entity of dimension `dim`
    and tag `tag`.
    
    Return `mat`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
     - `mat`: vector of doubles
    """
    function getMatrixOfInertia(dim, tag)
        api_mat_ = Ref{Ptr{Cdouble}}()
        api_mat_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccGetMatrixOfInertia, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              dim, tag, api_mat_, api_mat_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        mat = unsafe_wrap(Array, api_mat_[], api_mat_n_[], own = true)
        return mat
    end
    const get_matrix_of_inertia = getMatrixOfInertia
    
    """
        gmsh.model.occ.getMaxTag(dim)
    
    Get the maximum tag of entities of dimension `dim` in the OpenCASCADE CAD
    representation.
    
    Return an integer.
    
    Types:
     - `dim`: integer
    """
    function getMaxTag(dim)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshModelOccGetMaxTag, gmsh.lib), Cint,
              (Cint, Ptr{Cint}),
              dim, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const get_max_tag = getMaxTag
    
    """
        gmsh.model.occ.setMaxTag(dim, maxTag)
    
    Set the maximum tag `maxTag` for entities of dimension `dim` in the OpenCASCADE
    CAD representation.
    
    Types:
     - `dim`: integer
     - `maxTag`: integer
    """
    function setMaxTag(dim, maxTag)
        ierr = Ref{Cint}()
        ccall((:gmshModelOccSetMaxTag, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cint}),
              dim, maxTag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_max_tag = setMaxTag
    
    """
        gmsh.model.occ.synchronize()
    
    Synchronize the OpenCASCADE CAD representation with the current Gmsh model. This
    can be called at any time, but since it involves a non trivial amount of
    processing, the number of synchronization points should normally be minimized.
    Without synchronization the entities in the OpenCASCADE CAD representation are
    not available to any function outside of the OpenCASCADE CAD kernel functions.
    """
    function synchronize()
        ierr = Ref{Cint}()
        ccall((:gmshModelOccSynchronize, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        module gmsh.model.occ.mesh
    
    OpenCASCADE CAD kernel meshing constraints
    """
    module mesh
    
    import ....gmsh
    
    """
        gmsh.model.occ.mesh.setSize(dimTags, size)
    
    Set a mesh size constraint on the entities `dimTags` (given as a vector of (dim,
    tag) pairs) in the OpenCASCADE CAD representation. Currently only entities of
    dimension 0 (points) are handled.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `size`: double
    """
    function setSize(dimTags, size)
        api_dimTags_ = collect(Cint, Iterators.flatten(dimTags))
        api_dimTags_n_ = length(api_dimTags_)
        ierr = Ref{Cint}()
        ccall((:gmshModelOccMeshSetSize, gmsh.lib), Cvoid,
              (Ptr{Cint}, Csize_t, Cdouble, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, size, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_size = setSize
    
    end # end of module mesh
    
    end # end of module occ
    
    end # end of module model
    
    """
        module gmsh.view
    
    Post-processing view functions
    """
    module view
    
    import ..gmsh
    
    """
        gmsh.view.add(name, tag = -1)
    
    Add a new post-processing view, with name `name`. If `tag` is positive use it
    (and remove the view with that tag if it already exists), otherwise associate a
    new tag. Return the view tag.
    
    Return an integer.
    
    Types:
     - `name`: string
     - `tag`: integer
    """
    function add(name, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshViewAdd, gmsh.lib), Cint,
              (Ptr{Cchar}, Cint, Ptr{Cint}),
              name, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    
    """
        gmsh.view.remove(tag)
    
    Remove the view with tag `tag`.
    
    Types:
     - `tag`: integer
    """
    function remove(tag)
        ierr = Ref{Cint}()
        ccall((:gmshViewRemove, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}),
              tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.view.getIndex(tag)
    
    Get the index of the view with tag `tag` in the list of currently loaded views.
    This dynamic index (it can change when views are removed) is used to access view
    options.
    
    Return an integer.
    
    Types:
     - `tag`: integer
    """
    function getIndex(tag)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshViewGetIndex, gmsh.lib), Cint,
              (Cint, Ptr{Cint}),
              tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const get_index = getIndex
    
    """
        gmsh.view.getTags()
    
    Get the tags of all views.
    
    Return `tags`.
    
    Types:
     - `tags`: vector of integers
    """
    function getTags()
        api_tags_ = Ref{Ptr{Cint}}()
        api_tags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshViewGetTags, gmsh.lib), Cvoid,
              (Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              api_tags_, api_tags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tags = unsafe_wrap(Array, api_tags_[], api_tags_n_[], own = true)
        return tags
    end
    const get_tags = getTags
    
    """
        gmsh.view.addModelData(tag, step, modelName, dataType, tags, data, time = 0., numComponents = -1, partition = 0)
    
    Add model-based post-processing data to the view with tag `tag`. `modelName`
    identifies the model the data is attached to. `dataType` specifies the type of
    data, currently either "NodeData", "ElementData" or "ElementNodeData". `step`
    specifies the identifier (>= 0) of the data in a sequence. `tags` gives the tags
    of the nodes or elements in the mesh to which the data is associated. `data` is
    a vector of the same length as `tags`: each entry is the vector of double
    precision numbers representing the data associated with the corresponding tag.
    The optional `time` argument associate a time value with the data.
    `numComponents` gives the number of data components (1 for scalar data, 3 for
    vector data, etc.) per entity; if negative, it is automatically inferred (when
    possible) from the input data. `partition` allows one to specify data in several
    sub-sets.
    
    Types:
     - `tag`: integer
     - `step`: integer
     - `modelName`: string
     - `dataType`: string
     - `tags`: vector of sizes
     - `data`: vector of vectors of doubles
     - `time`: double
     - `numComponents`: integer
     - `partition`: integer
    """
    function addModelData(tag, step, modelName, dataType, tags, data, time = 0., numComponents = -1, partition = 0)
        api_data_n_ = [ length(data[i]) for i in 1:length(data) ]
        ierr = Ref{Cint}()
        ccall((:gmshViewAddModelData, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cchar}, Ptr{Cchar}, Ptr{Csize_t}, Csize_t, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Csize_t, Cdouble, Cint, Cint, Ptr{Cint}),
              tag, step, modelName, dataType, convert(Vector{Csize_t}, tags), length(tags), convert(Vector{Vector{Cdouble}},data), api_data_n_, length(data), time, numComponents, partition, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const add_model_data = addModelData
    
    """
        gmsh.view.addHomogeneousModelData(tag, step, modelName, dataType, tags, data, time = 0., numComponents = -1, partition = 0)
    
    Add homogeneous model-based post-processing data to the view with tag `tag`. The
    arguments have the same meaning as in `addModelData`, except that `data` is
    supposed to be homogeneous and is thus flattened in a single vector. For data
    types that can lead to different data sizes per tag (like "ElementNodeData"),
    the data should be padded.
    
    Types:
     - `tag`: integer
     - `step`: integer
     - `modelName`: string
     - `dataType`: string
     - `tags`: vector of sizes
     - `data`: vector of doubles
     - `time`: double
     - `numComponents`: integer
     - `partition`: integer
    """
    function addHomogeneousModelData(tag, step, modelName, dataType, tags, data, time = 0., numComponents = -1, partition = 0)
        ierr = Ref{Cint}()
        ccall((:gmshViewAddHomogeneousModelData, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cchar}, Ptr{Cchar}, Ptr{Csize_t}, Csize_t, Ptr{Cdouble}, Csize_t, Cdouble, Cint, Cint, Ptr{Cint}),
              tag, step, modelName, dataType, convert(Vector{Csize_t}, tags), length(tags), convert(Vector{Cdouble}, data), length(data), time, numComponents, partition, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const add_homogeneous_model_data = addHomogeneousModelData
    
    """
        gmsh.view.getModelData(tag, step)
    
    Get model-based post-processing data from the view with tag `tag` at step
    `step`. Return the `data` associated to the nodes or the elements with tags
    `tags`, as well as the `dataType` and the number of components `numComponents`.
    
    Return `dataType`, `tags`, `data`, `time`, `numComponents`.
    
    Types:
     - `tag`: integer
     - `step`: integer
     - `dataType`: string
     - `tags`: vector of sizes
     - `data`: vector of vectors of doubles
     - `time`: double
     - `numComponents`: integer
    """
    function getModelData(tag, step)
        api_dataType_ = Ref{Ptr{Cchar}}()
        api_tags_ = Ref{Ptr{Csize_t}}()
        api_tags_n_ = Ref{Csize_t}()
        api_data_ = Ref{Ptr{Ptr{Cdouble}}}()
        api_data_n_ = Ref{Ptr{Csize_t}}()
        api_data_nn_ = Ref{Csize_t}()
        api_time_ = Ref{Cdouble}()
        api_numComponents_ = Ref{Cint}()
        ierr = Ref{Cint}()
        ccall((:gmshViewGetModelData, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Cchar}}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Ptr{Cdouble}}}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Cdouble}, Ptr{Cint}, Ptr{Cint}),
              tag, step, api_dataType_, api_tags_, api_tags_n_, api_data_, api_data_n_, api_data_nn_, api_time_, api_numComponents_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        dataType = unsafe_string(api_dataType_[])
        tags = unsafe_wrap(Array, api_tags_[], api_tags_n_[], own = true)
        tmp_api_data_ = unsafe_wrap(Array, api_data_[], api_data_nn_[], own = true)
        tmp_api_data_n_ = unsafe_wrap(Array, api_data_n_[], api_data_nn_[], own = true)
        data = [ unsafe_wrap(Array, tmp_api_data_[i], tmp_api_data_n_[i], own = true) for i in 1:api_data_nn_[] ]
        return dataType, tags, data, api_time_[], api_numComponents_[]
    end
    const get_model_data = getModelData
    
    """
        gmsh.view.getHomogeneousModelData(tag, step)
    
    Get homogeneous model-based post-processing data from the view with tag `tag` at
    step `step`. The arguments have the same meaning as in `getModelData`, except
    that `data` is returned flattened in a single vector, with the appropriate
    padding if necessary.
    
    Return `dataType`, `tags`, `data`, `time`, `numComponents`.
    
    Types:
     - `tag`: integer
     - `step`: integer
     - `dataType`: string
     - `tags`: vector of sizes
     - `data`: vector of doubles
     - `time`: double
     - `numComponents`: integer
    """
    function getHomogeneousModelData(tag, step)
        api_dataType_ = Ref{Ptr{Cchar}}()
        api_tags_ = Ref{Ptr{Csize_t}}()
        api_tags_n_ = Ref{Csize_t}()
        api_data_ = Ref{Ptr{Cdouble}}()
        api_data_n_ = Ref{Csize_t}()
        api_time_ = Ref{Cdouble}()
        api_numComponents_ = Ref{Cint}()
        ierr = Ref{Cint}()
        ccall((:gmshViewGetHomogeneousModelData, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Cchar}}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cdouble}, Ptr{Cint}, Ptr{Cint}),
              tag, step, api_dataType_, api_tags_, api_tags_n_, api_data_, api_data_n_, api_time_, api_numComponents_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        dataType = unsafe_string(api_dataType_[])
        tags = unsafe_wrap(Array, api_tags_[], api_tags_n_[], own = true)
        data = unsafe_wrap(Array, api_data_[], api_data_n_[], own = true)
        return dataType, tags, data, api_time_[], api_numComponents_[]
    end
    const get_homogeneous_model_data = getHomogeneousModelData
    
    """
        gmsh.view.addListData(tag, dataType, numEle, data)
    
    Add list-based post-processing data to the view with tag `tag`. List-based
    datasets are independent from any model and any mesh. `dataType` identifies the
    data by concatenating the field type ("S" for scalar, "V" for vector, "T" for
    tensor) and the element type ("P" for point, "L" for line, "T" for triangle, "S"
    for tetrahedron, "I" for prism, "H" for hexaHedron, "Y" for pyramid). For
    example `dataType` should be "ST" for a scalar field on triangles. `numEle`
    gives the number of elements in the data. `data` contains the data for the
    `numEle` elements, concatenated, with node coordinates followed by values per
    node, repeated for each step: [e1x1, ..., e1xn, e1y1, ..., e1yn, e1z1, ...,
    e1zn, e1v1..., e1vN, e2x1, ...].
    
    Types:
     - `tag`: integer
     - `dataType`: string
     - `numEle`: integer
     - `data`: vector of doubles
    """
    function addListData(tag, dataType, numEle, data)
        ierr = Ref{Cint}()
        ccall((:gmshViewAddListData, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Cint, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              tag, dataType, numEle, convert(Vector{Cdouble}, data), length(data), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const add_list_data = addListData
    
    """
        gmsh.view.getListData(tag)
    
    Get list-based post-processing data from the view with tag `tag`. Return the
    types `dataTypes`, the number of elements `numElements` for each data type and
    the `data` for each data type.
    
    Return `dataType`, `numElements`, `data`.
    
    Types:
     - `tag`: integer
     - `dataType`: vector of strings
     - `numElements`: vector of integers
     - `data`: vector of vectors of doubles
    """
    function getListData(tag)
        api_dataType_ = Ref{Ptr{Ptr{Cchar}}}()
        api_dataType_n_ = Ref{Csize_t}()
        api_numElements_ = Ref{Ptr{Cint}}()
        api_numElements_n_ = Ref{Csize_t}()
        api_data_ = Ref{Ptr{Ptr{Cdouble}}}()
        api_data_n_ = Ref{Ptr{Csize_t}}()
        api_data_nn_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshViewGetListData, gmsh.lib), Cvoid,
              (Cint, Ptr{Ptr{Ptr{Cchar}}}, Ptr{Csize_t}, Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Ptr{Ptr{Cdouble}}}, Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Cint}),
              tag, api_dataType_, api_dataType_n_, api_numElements_, api_numElements_n_, api_data_, api_data_n_, api_data_nn_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_dataType_ = unsafe_wrap(Array, api_dataType_[], api_dataType_n_[], own = true)
        dataType = [unsafe_string(tmp_api_dataType_[i]) for i in 1:length(tmp_api_dataType_) ]
        numElements = unsafe_wrap(Array, api_numElements_[], api_numElements_n_[], own = true)
        tmp_api_data_ = unsafe_wrap(Array, api_data_[], api_data_nn_[], own = true)
        tmp_api_data_n_ = unsafe_wrap(Array, api_data_n_[], api_data_nn_[], own = true)
        data = [ unsafe_wrap(Array, tmp_api_data_[i], tmp_api_data_n_[i], own = true) for i in 1:api_data_nn_[] ]
        return dataType, numElements, data
    end
    const get_list_data = getListData
    
    """
        gmsh.view.addListDataString(tag, coord, data, style = [])
    
    Add a string to a list-based post-processing view with tag `tag`. If `coord`
    contains 3 coordinates the string is positioned in the 3D model space ("3D
    string"); if it contains 2 coordinates it is positioned in the 2D graphics
    viewport ("2D string"). `data` contains one or more (for multistep views)
    strings. `style` contains key-value pairs of styling parameters, concatenated.
    Available keys are "Font" (possible values: "Times-Roman", "Times-Bold", "Times-
    Italic", "Times-BoldItalic", "Helvetica", "Helvetica-Bold", "Helvetica-Oblique",
    "Helvetica-BoldOblique", "Courier", "Courier-Bold", "Courier-Oblique", "Courier-
    BoldOblique", "Symbol", "ZapfDingbats", "Screen"), "FontSize" and "Align"
    (possible values: "Left" or "BottomLeft", "Center" or "BottomCenter", "Right" or
    "BottomRight", "TopLeft", "TopCenter", "TopRight", "CenterLeft", "CenterCenter",
    "CenterRight").
    
    Types:
     - `tag`: integer
     - `coord`: vector of doubles
     - `data`: vector of strings
     - `style`: vector of strings
    """
    function addListDataString(tag, coord, data, style = [])
        ierr = Ref{Cint}()
        ccall((:gmshViewAddListDataString, gmsh.lib), Cvoid,
              (Cint, Ptr{Cdouble}, Csize_t, Ptr{Ptr{Cchar}}, Csize_t, Ptr{Ptr{Cchar}}, Csize_t, Ptr{Cint}),
              tag, convert(Vector{Cdouble}, coord), length(coord), data, length(data), style, length(style), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const add_list_data_string = addListDataString
    
    """
        gmsh.view.getListDataStrings(tag, dim)
    
    Get list-based post-processing data strings (2D strings if `dim` = 2, 3D strings
    if `dim` = 3) from the view with tag `tag`. Return the coordinates in `coord`,
    the strings in `data` and the styles in `style`.
    
    Return `coord`, `data`, `style`.
    
    Types:
     - `tag`: integer
     - `dim`: integer
     - `coord`: vector of doubles
     - `data`: vector of strings
     - `style`: vector of strings
    """
    function getListDataStrings(tag, dim)
        api_coord_ = Ref{Ptr{Cdouble}}()
        api_coord_n_ = Ref{Csize_t}()
        api_data_ = Ref{Ptr{Ptr{Cchar}}}()
        api_data_n_ = Ref{Csize_t}()
        api_style_ = Ref{Ptr{Ptr{Cchar}}}()
        api_style_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshViewGetListDataStrings, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Ptr{Ptr{Cchar}}}, Ptr{Csize_t}, Ptr{Ptr{Ptr{Cchar}}}, Ptr{Csize_t}, Ptr{Cint}),
              tag, dim, api_coord_, api_coord_n_, api_data_, api_data_n_, api_style_, api_style_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        coord = unsafe_wrap(Array, api_coord_[], api_coord_n_[], own = true)
        tmp_api_data_ = unsafe_wrap(Array, api_data_[], api_data_n_[], own = true)
        data = [unsafe_string(tmp_api_data_[i]) for i in 1:length(tmp_api_data_) ]
        tmp_api_style_ = unsafe_wrap(Array, api_style_[], api_style_n_[], own = true)
        style = [unsafe_string(tmp_api_style_[i]) for i in 1:length(tmp_api_style_) ]
        return coord, data, style
    end
    const get_list_data_strings = getListDataStrings
    
    """
        gmsh.view.setInterpolationMatrices(tag, type, d, coef, exp, dGeo = 0, coefGeo = Cdouble[], expGeo = Cdouble[])
    
    Set interpolation matrices for the element family `type` ("Line", "Triangle",
    "Quadrangle", "Tetrahedron", "Hexahedron", "Prism", "Pyramid") in the view
    `tag`. The approximation of the values over an element is written as a linear
    combination of `d` basis functions f_i(u, v, w) = sum_(j = 0, ..., `d` - 1)
    `coef`[i][j] u^`exp`[j][0] v^`exp`[j][1] w^`exp`[j][2], i = 0, ..., `d`-1, with
    u, v, w the coordinates in the reference element. The `coef` matrix (of size `d`
    x `d`) and the `exp` matrix (of size `d` x 3) are stored as vectors, by row. If
    `dGeo` is positive, use `coefGeo` and `expGeo` to define the interpolation of
    the x, y, z coordinates of the element in terms of the u, v, w coordinates, in
    exactly the same way. If `d` < 0, remove the interpolation matrices.
    
    Types:
     - `tag`: integer
     - `type`: string
     - `d`: integer
     - `coef`: vector of doubles
     - `exp`: vector of doubles
     - `dGeo`: integer
     - `coefGeo`: vector of doubles
     - `expGeo`: vector of doubles
    """
    function setInterpolationMatrices(tag, type, d, coef, exp, dGeo = 0, coefGeo = Cdouble[], expGeo = Cdouble[])
        ierr = Ref{Cint}()
        ccall((:gmshViewSetInterpolationMatrices, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Cint, Ptr{Cdouble}, Csize_t, Ptr{Cdouble}, Csize_t, Cint, Ptr{Cdouble}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              tag, type, d, convert(Vector{Cdouble}, coef), length(coef), convert(Vector{Cdouble}, exp), length(exp), dGeo, convert(Vector{Cdouble}, coefGeo), length(coefGeo), convert(Vector{Cdouble}, expGeo), length(expGeo), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_interpolation_matrices = setInterpolationMatrices
    
    """
        gmsh.view.addAlias(refTag, copyOptions = false, tag = -1)
    
    Add a post-processing view as an `alias` of the reference view with tag
    `refTag`. If `copyOptions` is set, copy the options of the reference view. If
    `tag` is positive use it (and remove the view with that tag if it already
    exists), otherwise associate a new tag. Return the view tag.
    
    Return an integer.
    
    Types:
     - `refTag`: integer
     - `copyOptions`: boolean
     - `tag`: integer
    """
    function addAlias(refTag, copyOptions = false, tag = -1)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshViewAddAlias, gmsh.lib), Cint,
              (Cint, Cint, Cint, Ptr{Cint}),
              refTag, copyOptions, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const add_alias = addAlias
    
    """
        gmsh.view.combine(what, how, remove = true, copyOptions = true)
    
    Combine elements (if `what` == "elements") or steps (if `what` == "steps") of
    all views (`how` == "all"), all visible views (`how` == "visible") or all views
    having the same name (`how` == "name"). Remove original views if `remove` is
    set.
    
    Types:
     - `what`: string
     - `how`: string
     - `remove`: boolean
     - `copyOptions`: boolean
    """
    function combine(what, how, remove = true, copyOptions = true)
        ierr = Ref{Cint}()
        ccall((:gmshViewCombine, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cchar}, Cint, Cint, Ptr{Cint}),
              what, how, remove, copyOptions, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.view.probe(tag, x, y, z, step = -1, numComp = -1, gradient = false, distanceMax = 0., xElemCoord = Cdouble[], yElemCoord = Cdouble[], zElemCoord = Cdouble[], dim = -1)
    
    Probe the view `tag` for its `values` at point (`x`, `y`, `z`). If no match is
    found, `value` is returned empty. Return only the value at step `step` is `step`
    is positive. Return only values with `numComp` if `numComp` is positive. Return
    the gradient of the `values` if `gradient` is set. If `distanceMax` is zero,
    only return a result if an exact match inside an element in the view is found;
    if `distanceMax` is positive and an exact match is not found, return the value
    at the closest node if it is closer than `distanceMax`; if `distanceMax` is
    negative and an exact match is not found, always return the value at the closest
    node. The distance to the match is returned in `distance`. Return the result
    from the element described by its coordinates if `xElementCoord`,
    `yElementCoord` and `zElementCoord` are provided. If `dim` is >= 0, return only
    matches from elements of the specified dimension.
    
    Return `values`, `distance`.
    
    Types:
     - `tag`: integer
     - `x`: double
     - `y`: double
     - `z`: double
     - `values`: vector of doubles
     - `distance`: double
     - `step`: integer
     - `numComp`: integer
     - `gradient`: boolean
     - `distanceMax`: double
     - `xElemCoord`: vector of doubles
     - `yElemCoord`: vector of doubles
     - `zElemCoord`: vector of doubles
     - `dim`: integer
    """
    function probe(tag, x, y, z, step = -1, numComp = -1, gradient = false, distanceMax = 0., xElemCoord = Cdouble[], yElemCoord = Cdouble[], zElemCoord = Cdouble[], dim = -1)
        api_values_ = Ref{Ptr{Cdouble}}()
        api_values_n_ = Ref{Csize_t}()
        api_distance_ = Ref{Cdouble}()
        ierr = Ref{Cint}()
        ccall((:gmshViewProbe, gmsh.lib), Cvoid,
              (Cint, Cdouble, Cdouble, Cdouble, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cdouble}, Cint, Cint, Cint, Cdouble, Ptr{Cdouble}, Csize_t, Ptr{Cdouble}, Csize_t, Ptr{Cdouble}, Csize_t, Cint, Ptr{Cint}),
              tag, x, y, z, api_values_, api_values_n_, api_distance_, step, numComp, gradient, distanceMax, convert(Vector{Cdouble}, xElemCoord), length(xElemCoord), convert(Vector{Cdouble}, yElemCoord), length(yElemCoord), convert(Vector{Cdouble}, zElemCoord), length(zElemCoord), dim, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        values = unsafe_wrap(Array, api_values_[], api_values_n_[], own = true)
        return values, api_distance_[]
    end
    
    """
        gmsh.view.write(tag, fileName, append = false)
    
    Write the view to a file `fileName`. The export format is determined by the file
    extension. Append to the file if `append` is set.
    
    Types:
     - `tag`: integer
     - `fileName`: string
     - `append`: boolean
    """
    function write(tag, fileName, append = false)
        ierr = Ref{Cint}()
        ccall((:gmshViewWrite, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Cint, Ptr{Cint}),
              tag, fileName, append, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.view.setVisibilityPerWindow(tag, value, windowIndex = 0)
    
    Set the global visibility of the view `tag` per window to `value`, where
    `windowIndex` identifies the window in the window list.
    
    Types:
     - `tag`: integer
     - `value`: integer
     - `windowIndex`: integer
    """
    function setVisibilityPerWindow(tag, value, windowIndex = 0)
        ierr = Ref{Cint}()
        ccall((:gmshViewSetVisibilityPerWindow, gmsh.lib), Cvoid,
              (Cint, Cint, Cint, Ptr{Cint}),
              tag, value, windowIndex, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_visibility_per_window = setVisibilityPerWindow
    
    """
        module gmsh.view.option
    
    View option handling functions
    """
    module option
    
    import ...gmsh
    
    """
        gmsh.view.option.setNumber(tag, name, value)
    
    Set the numerical option `name` to value `value` for the view with tag `tag`.
    
    Types:
     - `tag`: integer
     - `name`: string
     - `value`: double
    """
    function setNumber(tag, name, value)
        ierr = Ref{Cint}()
        ccall((:gmshViewOptionSetNumber, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Cdouble, Ptr{Cint}),
              tag, name, value, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_number = setNumber
    
    """
        gmsh.view.option.getNumber(tag, name)
    
    Get the `value` of the numerical option `name` for the view with tag `tag`.
    
    Return `value`.
    
    Types:
     - `tag`: integer
     - `name`: string
     - `value`: double
    """
    function getNumber(tag, name)
        api_value_ = Ref{Cdouble}()
        ierr = Ref{Cint}()
        ccall((:gmshViewOptionGetNumber, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Ptr{Cdouble}, Ptr{Cint}),
              tag, name, api_value_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_value_[]
    end
    const get_number = getNumber
    
    """
        gmsh.view.option.setString(tag, name, value)
    
    Set the string option `name` to value `value` for the view with tag `tag`.
    
    Types:
     - `tag`: integer
     - `name`: string
     - `value`: string
    """
    function setString(tag, name, value)
        ierr = Ref{Cint}()
        ccall((:gmshViewOptionSetString, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Ptr{Cchar}, Ptr{Cint}),
              tag, name, value, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_string = setString
    
    """
        gmsh.view.option.getString(tag, name)
    
    Get the `value` of the string option `name` for the view with tag `tag`.
    
    Return `value`.
    
    Types:
     - `tag`: integer
     - `name`: string
     - `value`: string
    """
    function getString(tag, name)
        api_value_ = Ref{Ptr{Cchar}}()
        ierr = Ref{Cint}()
        ccall((:gmshViewOptionGetString, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Ptr{Ptr{Cchar}}, Ptr{Cint}),
              tag, name, api_value_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        value = unsafe_string(api_value_[])
        return value
    end
    const get_string = getString
    
    """
        gmsh.view.option.setColor(tag, name, r, g, b, a = 255)
    
    Set the color option `name` to the RGBA value (`r`, `g`, `b`, `a`) for the view
    with tag `tag`, where where `r`, `g`, `b` and `a` should be integers between 0
    and 255.
    
    Types:
     - `tag`: integer
     - `name`: string
     - `r`: integer
     - `g`: integer
     - `b`: integer
     - `a`: integer
    """
    function setColor(tag, name, r, g, b, a = 255)
        ierr = Ref{Cint}()
        ccall((:gmshViewOptionSetColor, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Cint, Cint, Cint, Cint, Ptr{Cint}),
              tag, name, r, g, b, a, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_color = setColor
    
    """
        gmsh.view.option.getColor(tag, name)
    
    Get the `r`, `g`, `b`, `a` value of the color option `name` for the view with
    tag `tag`.
    
    Return `r`, `g`, `b`, `a`.
    
    Types:
     - `tag`: integer
     - `name`: string
     - `r`: integer
     - `g`: integer
     - `b`: integer
     - `a`: integer
    """
    function getColor(tag, name)
        api_r_ = Ref{Cint}()
        api_g_ = Ref{Cint}()
        api_b_ = Ref{Cint}()
        api_a_ = Ref{Cint}()
        ierr = Ref{Cint}()
        ccall((:gmshViewOptionGetColor, gmsh.lib), Cvoid,
              (Cint, Ptr{Cchar}, Ptr{Cint}, Ptr{Cint}, Ptr{Cint}, Ptr{Cint}, Ptr{Cint}),
              tag, name, api_r_, api_g_, api_b_, api_a_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_r_[], api_g_[], api_b_[], api_a_[]
    end
    const get_color = getColor
    
    """
        gmsh.view.option.copy(refTag, tag)
    
    Copy the options from the view with tag `refTag` to the view with tag `tag`.
    
    Types:
     - `refTag`: integer
     - `tag`: integer
    """
    function copy(refTag, tag)
        ierr = Ref{Cint}()
        ccall((:gmshViewOptionCopy, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cint}),
              refTag, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    end # end of module option
    
    end # end of module view
    
    """
        module gmsh.plugin
    
    Plugin functions
    """
    module plugin
    
    import ..gmsh
    
    """
        gmsh.plugin.setNumber(name, option, value)
    
    Set the numerical option `option` to the value `value` for plugin `name`.
    
    Types:
     - `name`: string
     - `option`: string
     - `value`: double
    """
    function setNumber(name, option, value)
        ierr = Ref{Cint}()
        ccall((:gmshPluginSetNumber, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cchar}, Cdouble, Ptr{Cint}),
              name, option, value, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_number = setNumber
    
    """
        gmsh.plugin.setString(name, option, value)
    
    Set the string option `option` to the value `value` for plugin `name`.
    
    Types:
     - `name`: string
     - `option`: string
     - `value`: string
    """
    function setString(name, option, value)
        ierr = Ref{Cint}()
        ccall((:gmshPluginSetString, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cchar}, Ptr{Cchar}, Ptr{Cint}),
              name, option, value, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_string = setString
    
    """
        gmsh.plugin.run(name)
    
    Run the plugin `name`. Return the tag of the created view (if any).
    
    Return an integer.
    
    Types:
     - `name`: string
    """
    function run(name)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshPluginRun, gmsh.lib), Cint,
              (Ptr{Cchar}, Ptr{Cint}),
              name, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    
    end # end of module plugin
    
    """
        module gmsh.graphics
    
    Graphics functions
    """
    module graphics
    
    import ..gmsh
    
    """
        gmsh.graphics.draw()
    
    Draw all the OpenGL scenes.
    """
    function draw()
        ierr = Ref{Cint}()
        ccall((:gmshGraphicsDraw, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    end # end of module graphics
    
    """
        module gmsh.fltk
    
    FLTK graphical user interface functions
    """
    module fltk
    
    import ..gmsh
    
    """
        gmsh.fltk.initialize()
    
    Create the FLTK graphical user interface. Can only be called in the main thread.
    """
    function initialize()
        ierr = Ref{Cint}()
        ccall((:gmshFltkInitialize, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.fltk.finalize()
    
    Close the FLTK graphical user interface. Can only be called in the main thread.
    """
    function finalize()
        ierr = Ref{Cint}()
        ccall((:gmshFltkFinalize, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.fltk.wait(time = -1.)
    
    Wait at most `time` seconds for user interface events and return. If `time` < 0,
    wait indefinitely. First automatically create the user interface if it has not
    yet been initialized. Can only be called in the main thread.
    
    Types:
     - `time`: double
    """
    function wait(time = -1.)
        ierr = Ref{Cint}()
        ccall((:gmshFltkWait, gmsh.lib), Cvoid,
              (Cdouble, Ptr{Cint}),
              time, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.fltk.update()
    
    Update the user interface (potentially creating new widgets and windows). First
    automatically create the user interface if it has not yet been initialized. Can
    only be called in the main thread: use `awake("update")` to trigger an update of
    the user interface from another thread.
    """
    function update()
        ierr = Ref{Cint}()
        ccall((:gmshFltkUpdate, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.fltk.awake(action = "")
    
    Awake the main user interface thread and process pending events, and optionally
    perform an action (currently the only `action` allowed is "update").
    
    Types:
     - `action`: string
    """
    function awake(action = "")
        ierr = Ref{Cint}()
        ccall((:gmshFltkAwake, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}),
              action, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.fltk.lock()
    
    Block the current thread until it can safely modify the user interface.
    """
    function lock()
        ierr = Ref{Cint}()
        ccall((:gmshFltkLock, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.fltk.unlock()
    
    Release the lock that was set using lock.
    """
    function unlock()
        ierr = Ref{Cint}()
        ccall((:gmshFltkUnlock, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.fltk.run()
    
    Run the event loop of the graphical user interface, i.e. repeatedly call
    `wait()`. First automatically create the user interface if it has not yet been
    initialized. Can only be called in the main thread.
    """
    function run()
        ierr = Ref{Cint}()
        ccall((:gmshFltkRun, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.fltk.isAvailable()
    
    Check if the user interface is available (e.g. to detect if it has been closed).
    
    Return an integer.
    """
    function isAvailable()
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshFltkIsAvailable, gmsh.lib), Cint,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const is_available = isAvailable
    
    """
        gmsh.fltk.selectEntities(dim = -1)
    
    Select entities in the user interface. Return the selected entities as a vector
    of (dim, tag) pairs. If `dim` is >= 0, return only the entities of the specified
    dimension (e.g. points if `dim` == 0).
    
    Return an integer, `dimTags`.
    
    Types:
     - `dimTags`: vector of pairs of integers
     - `dim`: integer
    """
    function selectEntities(dim = -1)
        api_dimTags_ = Ref{Ptr{Cint}}()
        api_dimTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshFltkSelectEntities, gmsh.lib), Cint,
              (Ptr{Ptr{Cint}}, Ptr{Csize_t}, Cint, Ptr{Cint}),
              api_dimTags_, api_dimTags_n_, dim, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_dimTags_ = unsafe_wrap(Array, api_dimTags_[], api_dimTags_n_[], own = true)
        dimTags = [ (tmp_api_dimTags_[i], tmp_api_dimTags_[i+1]) for i in 1:2:length(tmp_api_dimTags_) ]
        return api_result_, dimTags
    end
    const select_entities = selectEntities
    
    """
        gmsh.fltk.selectElements()
    
    Select elements in the user interface.
    
    Return an integer, `elementTags`.
    
    Types:
     - `elementTags`: vector of sizes
    """
    function selectElements()
        api_elementTags_ = Ref{Ptr{Csize_t}}()
        api_elementTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshFltkSelectElements, gmsh.lib), Cint,
              (Ptr{Ptr{Csize_t}}, Ptr{Csize_t}, Ptr{Cint}),
              api_elementTags_, api_elementTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        elementTags = unsafe_wrap(Array, api_elementTags_[], api_elementTags_n_[], own = true)
        return api_result_, elementTags
    end
    const select_elements = selectElements
    
    """
        gmsh.fltk.selectViews()
    
    Select views in the user interface.
    
    Return an integer, `viewTags`.
    
    Types:
     - `viewTags`: vector of integers
    """
    function selectViews()
        api_viewTags_ = Ref{Ptr{Cint}}()
        api_viewTags_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshFltkSelectViews, gmsh.lib), Cint,
              (Ptr{Ptr{Cint}}, Ptr{Csize_t}, Ptr{Cint}),
              api_viewTags_, api_viewTags_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        viewTags = unsafe_wrap(Array, api_viewTags_[], api_viewTags_n_[], own = true)
        return api_result_, viewTags
    end
    const select_views = selectViews
    
    """
        gmsh.fltk.splitCurrentWindow(how = "v", ratio = 0.5)
    
    Split the current window horizontally (if `how` = "h") or vertically (if `how` =
    "v"), using ratio `ratio`. If `how` = "u", restore a single window.
    
    Types:
     - `how`: string
     - `ratio`: double
    """
    function splitCurrentWindow(how = "v", ratio = 0.5)
        ierr = Ref{Cint}()
        ccall((:gmshFltkSplitCurrentWindow, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Cdouble, Ptr{Cint}),
              how, ratio, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const split_current_window = splitCurrentWindow
    
    """
        gmsh.fltk.setCurrentWindow(windowIndex = 0)
    
    Set the current window by speficying its index (starting at 0) in the list of
    all windows. When new windows are created by splits, new windows are appended at
    the end of the list.
    
    Types:
     - `windowIndex`: integer
    """
    function setCurrentWindow(windowIndex = 0)
        ierr = Ref{Cint}()
        ccall((:gmshFltkSetCurrentWindow, gmsh.lib), Cvoid,
              (Cint, Ptr{Cint}),
              windowIndex, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_current_window = setCurrentWindow
    
    """
        gmsh.fltk.setStatusMessage(message, graphics = false)
    
    Set a status message in the current window. If `graphics` is set, display the
    message inside the graphic window instead of the status bar.
    
    Types:
     - `message`: string
     - `graphics`: boolean
    """
    function setStatusMessage(message, graphics = false)
        ierr = Ref{Cint}()
        ccall((:gmshFltkSetStatusMessage, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Cint, Ptr{Cint}),
              message, graphics, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_status_message = setStatusMessage
    
    """
        gmsh.fltk.showContextWindow(dim, tag)
    
    Show context window for the entity of dimension `dim` and tag `tag`.
    
    Types:
     - `dim`: integer
     - `tag`: integer
    """
    function showContextWindow(dim, tag)
        ierr = Ref{Cint}()
        ccall((:gmshFltkShowContextWindow, gmsh.lib), Cvoid,
              (Cint, Cint, Ptr{Cint}),
              dim, tag, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const show_context_window = showContextWindow
    
    """
        gmsh.fltk.openTreeItem(name)
    
    Open the `name` item in the menu tree.
    
    Types:
     - `name`: string
    """
    function openTreeItem(name)
        ierr = Ref{Cint}()
        ccall((:gmshFltkOpenTreeItem, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}),
              name, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const open_tree_item = openTreeItem
    
    """
        gmsh.fltk.closeTreeItem(name)
    
    Close the `name` item in the menu tree.
    
    Types:
     - `name`: string
    """
    function closeTreeItem(name)
        ierr = Ref{Cint}()
        ccall((:gmshFltkCloseTreeItem, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}),
              name, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const close_tree_item = closeTreeItem
    
    end # end of module fltk
    
    """
        module gmsh.parser
    
    Parser functions
    """
    module parser
    
    import ..gmsh
    
    """
        gmsh.parser.getNames(search = "")
    
    Get the names of the variables in the Gmsh parser matching the `search` regular
    expression. If `search` is empty, return all the names.
    
    Return `names`.
    
    Types:
     - `names`: vector of strings
     - `search`: string
    """
    function getNames(search = "")
        api_names_ = Ref{Ptr{Ptr{Cchar}}}()
        api_names_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshParserGetNames, gmsh.lib), Cvoid,
              (Ptr{Ptr{Ptr{Cchar}}}, Ptr{Csize_t}, Ptr{Cchar}, Ptr{Cint}),
              api_names_, api_names_n_, search, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_names_ = unsafe_wrap(Array, api_names_[], api_names_n_[], own = true)
        names = [unsafe_string(tmp_api_names_[i]) for i in 1:length(tmp_api_names_) ]
        return names
    end
    const get_names = getNames
    
    """
        gmsh.parser.setNumber(name, value)
    
    Set the value of the number variable `name` in the Gmsh parser. Create the
    variable if it does not exist; update the value if the variable exists.
    
    Types:
     - `name`: string
     - `value`: vector of doubles
    """
    function setNumber(name, value)
        ierr = Ref{Cint}()
        ccall((:gmshParserSetNumber, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              name, convert(Vector{Cdouble}, value), length(value), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_number = setNumber
    
    """
        gmsh.parser.setString(name, value)
    
    Set the value of the string variable `name` in the Gmsh parser. Create the
    variable if it does not exist; update the value if the variable exists.
    
    Types:
     - `name`: string
     - `value`: vector of strings
    """
    function setString(name, value)
        ierr = Ref{Cint}()
        ccall((:gmshParserSetString, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Ptr{Cchar}}, Csize_t, Ptr{Cint}),
              name, value, length(value), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_string = setString
    
    """
        gmsh.parser.getNumber(name)
    
    Get the value of the number variable `name` from the Gmsh parser. Return an
    empty vector if the variable does not exist.
    
    Return `value`.
    
    Types:
     - `name`: string
     - `value`: vector of doubles
    """
    function getNumber(name)
        api_value_ = Ref{Ptr{Cdouble}}()
        api_value_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshParserGetNumber, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              name, api_value_, api_value_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        value = unsafe_wrap(Array, api_value_[], api_value_n_[], own = true)
        return value
    end
    const get_number = getNumber
    
    """
        gmsh.parser.getString(name)
    
    Get the value of the string variable `name` from the Gmsh parser. Return an
    empty vector if the variable does not exist.
    
    Return `value`.
    
    Types:
     - `name`: string
     - `value`: vector of strings
    """
    function getString(name)
        api_value_ = Ref{Ptr{Ptr{Cchar}}}()
        api_value_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshParserGetString, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Ptr{Ptr{Cchar}}}, Ptr{Csize_t}, Ptr{Cint}),
              name, api_value_, api_value_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_value_ = unsafe_wrap(Array, api_value_[], api_value_n_[], own = true)
        value = [unsafe_string(tmp_api_value_[i]) for i in 1:length(tmp_api_value_) ]
        return value
    end
    const get_string = getString
    
    """
        gmsh.parser.clear(name = "")
    
    Clear all the Gmsh parser variables, or remove a single variable if `name` is
    given.
    
    Types:
     - `name`: string
    """
    function clear(name = "")
        ierr = Ref{Cint}()
        ccall((:gmshParserClear, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}),
              name, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.parser.parse(fileName)
    
    Parse the file `fileName` with the Gmsh parser.
    
    Types:
     - `fileName`: string
    """
    function parse(fileName)
        ierr = Ref{Cint}()
        ccall((:gmshParserParse, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}),
              fileName, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    end # end of module parser
    
    """
        module gmsh.onelab
    
    ONELAB server functions
    """
    module onelab
    
    import ..gmsh
    
    """
        gmsh.onelab.set(data, format = "json")
    
    Set one or more parameters in the ONELAB database, encoded in `format`.
    
    Types:
     - `data`: string
     - `format`: string
    """
    function set(data, format = "json")
        ierr = Ref{Cint}()
        ccall((:gmshOnelabSet, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cchar}, Ptr{Cint}),
              data, format, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.onelab.get(name = "", format = "json")
    
    Get all the parameters (or a single one if `name` is specified) from the ONELAB
    database, encoded in `format`.
    
    Return `data`.
    
    Types:
     - `data`: string
     - `name`: string
     - `format`: string
    """
    function get(name = "", format = "json")
        api_data_ = Ref{Ptr{Cchar}}()
        ierr = Ref{Cint}()
        ccall((:gmshOnelabGet, gmsh.lib), Cvoid,
              (Ptr{Ptr{Cchar}}, Ptr{Cchar}, Ptr{Cchar}, Ptr{Cint}),
              api_data_, name, format, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        data = unsafe_string(api_data_[])
        return data
    end
    
    """
        gmsh.onelab.getNames(search = "")
    
    Get the names of the parameters in the ONELAB database matching the `search`
    regular expression. If `search` is empty, return all the names.
    
    Return `names`.
    
    Types:
     - `names`: vector of strings
     - `search`: string
    """
    function getNames(search = "")
        api_names_ = Ref{Ptr{Ptr{Cchar}}}()
        api_names_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshOnelabGetNames, gmsh.lib), Cvoid,
              (Ptr{Ptr{Ptr{Cchar}}}, Ptr{Csize_t}, Ptr{Cchar}, Ptr{Cint}),
              api_names_, api_names_n_, search, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_names_ = unsafe_wrap(Array, api_names_[], api_names_n_[], own = true)
        names = [unsafe_string(tmp_api_names_[i]) for i in 1:length(tmp_api_names_) ]
        return names
    end
    const get_names = getNames
    
    """
        gmsh.onelab.setNumber(name, value)
    
    Set the value of the number parameter `name` in the ONELAB database. Create the
    parameter if it does not exist; update the value if the parameter exists.
    
    Types:
     - `name`: string
     - `value`: vector of doubles
    """
    function setNumber(name, value)
        ierr = Ref{Cint}()
        ccall((:gmshOnelabSetNumber, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cdouble}, Csize_t, Ptr{Cint}),
              name, convert(Vector{Cdouble}, value), length(value), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_number = setNumber
    
    """
        gmsh.onelab.setString(name, value)
    
    Set the value of the string parameter `name` in the ONELAB database. Create the
    parameter if it does not exist; update the value if the parameter exists.
    
    Types:
     - `name`: string
     - `value`: vector of strings
    """
    function setString(name, value)
        ierr = Ref{Cint}()
        ccall((:gmshOnelabSetString, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Ptr{Cchar}}, Csize_t, Ptr{Cint}),
              name, value, length(value), ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_string = setString
    
    """
        gmsh.onelab.getNumber(name)
    
    Get the value of the number parameter `name` from the ONELAB database. Return an
    empty vector if the parameter does not exist.
    
    Return `value`.
    
    Types:
     - `name`: string
     - `value`: vector of doubles
    """
    function getNumber(name)
        api_value_ = Ref{Ptr{Cdouble}}()
        api_value_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshOnelabGetNumber, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Ptr{Cdouble}}, Ptr{Csize_t}, Ptr{Cint}),
              name, api_value_, api_value_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        value = unsafe_wrap(Array, api_value_[], api_value_n_[], own = true)
        return value
    end
    const get_number = getNumber
    
    """
        gmsh.onelab.getString(name)
    
    Get the value of the string parameter `name` from the ONELAB database. Return an
    empty vector if the parameter does not exist.
    
    Return `value`.
    
    Types:
     - `name`: string
     - `value`: vector of strings
    """
    function getString(name)
        api_value_ = Ref{Ptr{Ptr{Cchar}}}()
        api_value_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshOnelabGetString, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Ptr{Ptr{Cchar}}}, Ptr{Csize_t}, Ptr{Cint}),
              name, api_value_, api_value_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_value_ = unsafe_wrap(Array, api_value_[], api_value_n_[], own = true)
        value = [unsafe_string(tmp_api_value_[i]) for i in 1:length(tmp_api_value_) ]
        return value
    end
    const get_string = getString
    
    """
        gmsh.onelab.getChanged(name)
    
    Check if any parameters in the ONELAB database used by the client `name` have
    been changed.
    
    Return an integer.
    
    Types:
     - `name`: string
    """
    function getChanged(name)
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshOnelabGetChanged, gmsh.lib), Cint,
              (Ptr{Cchar}, Ptr{Cint}),
              name, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const get_changed = getChanged
    
    """
        gmsh.onelab.setChanged(name, value)
    
    Set the changed flag to value `value` for all the parameters in the ONELAB
    database used by the client `name`.
    
    Types:
     - `name`: string
     - `value`: integer
    """
    function setChanged(name, value)
        ierr = Ref{Cint}()
        ccall((:gmshOnelabSetChanged, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Cint, Ptr{Cint}),
              name, value, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    const set_changed = setChanged
    
    """
        gmsh.onelab.clear(name = "")
    
    Clear the ONELAB database, or remove a single parameter if `name` is given.
    
    Types:
     - `name`: string
    """
    function clear(name = "")
        ierr = Ref{Cint}()
        ccall((:gmshOnelabClear, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cint}),
              name, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.onelab.run(name = "", command = "")
    
    Run a ONELAB client. If `name` is provided, create a new ONELAB client with name
    `name` and executes `command`. If not, try to run a client that might be linked
    to the processed input files.
    
    Types:
     - `name`: string
     - `command`: string
    """
    function run(name = "", command = "")
        ierr = Ref{Cint}()
        ccall((:gmshOnelabRun, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cchar}, Ptr{Cint}),
              name, command, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    end # end of module onelab
    
    """
        module gmsh.logger
    
    Information logging functions
    """
    module logger
    
    import ..gmsh
    
    """
        gmsh.logger.write(message, level = "info")
    
    Write a `message`. `level` can be "info", "warning" or "error".
    
    Types:
     - `message`: string
     - `level`: string
    """
    function write(message, level = "info")
        ierr = Ref{Cint}()
        ccall((:gmshLoggerWrite, gmsh.lib), Cvoid,
              (Ptr{Cchar}, Ptr{Cchar}, Ptr{Cint}),
              message, level, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.logger.start()
    
    Start logging messages.
    """
    function start()
        ierr = Ref{Cint}()
        ccall((:gmshLoggerStart, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.logger.get()
    
    Get logged messages.
    
    Return `log`.
    
    Types:
     - `log`: vector of strings
    """
    function get()
        api_log_ = Ref{Ptr{Ptr{Cchar}}}()
        api_log_n_ = Ref{Csize_t}()
        ierr = Ref{Cint}()
        ccall((:gmshLoggerGet, gmsh.lib), Cvoid,
              (Ptr{Ptr{Ptr{Cchar}}}, Ptr{Csize_t}, Ptr{Cint}),
              api_log_, api_log_n_, ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        tmp_api_log_ = unsafe_wrap(Array, api_log_[], api_log_n_[], own = true)
        log = [unsafe_string(tmp_api_log_[i]) for i in 1:length(tmp_api_log_) ]
        return log
    end
    
    """
        gmsh.logger.stop()
    
    Stop logging messages.
    """
    function stop()
        ierr = Ref{Cint}()
        ccall((:gmshLoggerStop, gmsh.lib), Cvoid,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return nothing
    end
    
    """
        gmsh.logger.getWallTime()
    
    Return wall clock time.
    
    Return a double.
    """
    function getWallTime()
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshLoggerGetWallTime, gmsh.lib), Cdouble,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const get_wall_time = getWallTime
    
    """
        gmsh.logger.getCpuTime()
    
    Return CPU time.
    
    Return a double.
    """
    function getCpuTime()
        ierr = Ref{Cint}()
        api_result_ = ccall((:gmshLoggerGetCpuTime, gmsh.lib), Cdouble,
              (Ptr{Cint},),
              ierr)
        ierr[] != 0 && error(gmsh.logger.getLastError())
        return api_result_
    end
    const get_cpu_time = getCpuTime
    
    """
        gmsh.logger.getLastError()
    
    Return last error message, if any.
    
    Return `error`.
    
    Types:
     - `error`: string
    """
    function getLastError()
        api_error_ = Ref{Ptr{Cchar}}()
        ierr = Ref{Cint}()
        ccall((:gmshLoggerGetLastError, gmsh.lib), Cvoid,
              (Ptr{Ptr{Cchar}}, Ptr{Cint}),
              api_error_, ierr)
        ierr[] != 0 && error("Could not get last error")
        error = unsafe_string(api_error_[])
        return error
    end
    const get_last_error = getLastError
    
    end # end of module logger
    
    end # end of module gmsh