DofMap Class Reference

Degree-of-freedom map. More...

#include <DofMap.h>

Public Member Functions
template<typename E , typename U > requires std::is_convertible_v<std::remove_cvref_t<E>, fem::ElementDofLayout> and std::is_convertible_v<std::remove_cvref_t<U>, std::vector<std::int32_t>>
	DofMap (E &&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.
	DofMap (const DofMap &dofmap)=delete
	DofMap (DofMap &&dofmap)=default
	Move constructor.
DofMap &	operator= (const DofMap &dofmap)=delete
DofMap &	operator= (DofMap &&dofmap)=default
	Move assignment.
bool	operator== (const DofMap &map) const
	Equality operator.
std::span< const std::int32_t >	cell_dofs (std::int32_t c) const
	Local-to-global mapping of dofs on a cell.
int	bs () const noexcept
	Return the block size for the dofmap.
DofMap	extract_sub_dofmap (std::span< const int > component) const
	Extract subdofmap component.
std::pair< 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::reorder_gps(g);}) const
	Create a "collapsed" dofmap (collapses a sub-dofmap)
MDSPAN_IMPL_STANDARD_NAMESPACE::mdspan< const std::int32_t, MDSPAN_IMPL_STANDARD_NAMESPACE::dextents< std::size_t, 2 > >	map () const
	Get dofmap data.
const ElementDofLayout &	element_dof_layout () const
	Layout of dofs on an element.
int	index_map_bs () const
	Block size associated with the index_map.

Public Attributes
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 E , typename U >
requires std::is_convertible_v<std::remove_cvref_t<E>, fem::ElementDofLayout> and std::is_convertible_v<std::remove_cvref_t<U>, std::vector<std::int32_t>>

DofMap ( E && 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 with the degrees-of-freedom for each cell.
[in]	bs	The block size of the dofmap.

Member Function Documentation

cell_dofs()

std::span< const std::int32_t > cell_dofs ( std::int32_t c ) const

inline

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

Parameters

[in]

c

The cell index

Returns

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

collapse()

std::pair< 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::reorder_gps(g); } ) const

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

Parameters

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

Returns

The collapsed dofmap

extract_sub_dofmap()

DofMap extract_sub_dofmap

(

std::span< const int >

component

)

const

Extract subdofmap component.

Parameters

[in]

component

The component indices

Returns

The dofmap for the component

map()

MDSPAN_IMPL_STANDARD_NAMESPACE::mdspan< const std::int32_t, MDSPAN_IMPL_STANDARD_NAMESPACE::dextents< std::size_t, 2 > > map

(

)

const

Get dofmap data.

Returns

The adjacency list with dof indices for each cell

operator==()

bool operator==

(

const DofMap &

map

)

const

Equality operator.

Returns

Returns true if the data for the two dofmaps are equal

---

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