dolfinx::fem::DofMap Class Reference

Degree-of-freedom map. More...

#include <DofMap.h>

Public Member Functions
template<typename U , typename = std::enable_if_t<std::is_same< graph::AdjacencyList<std::int32_t>, std::decay_t<U>>::value>>
	DofMap (std::shared_ptr< const ElementDofLayout > element, std::shared_ptr< const common::IndexMap > index_map, int index_map_bs, U &&dofmap, int bs)
	Create a DofMap from the layout of dofs on a reference element, an IndexMap defining the distribution of dofs across processes and a vector of indices. More...
	DofMap (const DofMap &dofmap)=delete
	DofMap (DofMap &&dofmap)=default
	Move constructor.
virtual	~DofMap ()=default
	Destructor.
DofMap &	operator= (const DofMap &dofmap)=delete
DofMap &	operator= (DofMap &&dofmap)=default
	Move assignment.
xtl::span< const std::int32_t >	cell_dofs (int cell) const
	Local-to-global mapping of dofs on a cell. More...
int	bs () const noexcept
	Return the block size for the dofmap.
DofMap	extract_sub_dofmap (const std::vector< int > &component) const
	Extract subdofmap component. More...
std::pair< std::unique_ptr< DofMap >, std::vector< std::int32_t > >	collapse (MPI_Comm comm, const mesh::Topology &topology, const std::function< std::vector< int >(const graph::AdjacencyList< std::int32_t > &)> &reorder_fn=[](const graph::AdjacencyList< std::int32_t > &g) { return graph::scotch::compute_gps(g, 2).first;}) const
	Create a "collapsed" dofmap (collapses a sub-dofmap) More...
const graph::AdjacencyList< std::int32_t > &	list () const
	Get dofmap data. More...
int	index_map_bs () const
	Block size associated with the index_map.

Public Attributes
std::shared_ptr< const ElementDofLayout >	element_dof_layout
	Layout of dofs on an element.
std::shared_ptr< const common::IndexMap >	index_map
	Index map that describes the parallel distribution of the dofmap.

Detailed Description

Degree-of-freedom map.

This class handles the mapping of degrees of freedom. It builds a dof map based on an ElementDofLayout on a specific mesh topology. It will reorder the dofs when running in parallel. Sub-dofmaps, both views and copies, are supported.

Constructor & Destructor Documentation

DofMap()

template<typename U , typename = std::enable_if_t<std::is_same< graph::AdjacencyList<std::int32_t>, std::decay_t<U>>::value>>

dolfinx::fem::DofMap::DofMap ( std::shared_ptr< const ElementDofLayout >  element, std::shared_ptr< const common::IndexMap >  index_map, int  index_map_bs, U &&  dofmap, int  bs  )

inline

Create a DofMap from the layout of dofs on a reference element, an IndexMap defining the distribution of dofs across processes and a vector of indices.

Parameters

[in]	element	The layout of the degrees of freedom on an element
[in]	index_map	The map describing the parallel distribution of the degrees of freedom
[in]	index_map_bs	The block size associated with the index_map
[in]	dofmap	Adjacency list (graph::AdjacencyList<std::int32_t>) with the degrees-of-freedom for each cell
[in]	bs	The block size of the dofmap

Member Function Documentation

cell_dofs()

xtl::span<const std::int32_t> dolfinx::fem::DofMap::cell_dofs ( int  cell ) const

inline

Local-to-global mapping of dofs on a cell.

Parameters

[in]

cell

The cell index

Returns

Local-global dof map for the cell (using process-local indices)

collapse()

std::pair< std::unique_ptr< DofMap >, std::vector< std::int32_t > > DofMap::collapse	(	MPI_Comm	comm,
		const mesh::Topology &	topology,
		const std::function< std::vector< int >(const graph::AdjacencyList< std::int32_t > &)> &	reorder_fn = [](const graph::AdjacencyList<std::int32_t>& g) { return graph::scotch::compute_gps(g, 2).first; }
	)		const

Create a "collapsed" dofmap (collapses a sub-dofmap)

Parameters

[in]	comm	MPI Communicator
[in]	topology	The mesh topology that the dofmap is defined on
[in]	reorder_fn	The graph re-ordering function to apply to the dof data

Returns

The collapsed dofmap

extract_sub_dofmap()

DofMap DofMap::extract_sub_dofmap

(

const std::vector< int > &

component

)

const

Extract subdofmap component.

Parameters

[in]

component

The component indices

Returns

The dofmap for the component

list()

const graph::AdjacencyList< std::int32_t > & DofMap::list

(

)

const

Get dofmap data.

Returns

The adjacency list with dof indices for each cell

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The documentation for this class was generated from the following files:

• /__w/dolfinx/dolfinx/cpp/dolfinx/fem/DofMap.h
• /__w/dolfinx/dolfinx/cpp/dolfinx/fem/DofMap.cpp