MeshTags< T > Class Template Reference

MeshTags associate values with mesh topology entities. More...

#include <MeshTags.h>

Public Member Functions
template<typename U , typename V > requires std::is_convertible_v<std::remove_cvref_t<U>, std::vector<std::int32_t>> and std::is_convertible_v<std::remove_cvref_t<V>, std::vector<T>>
	MeshTags (std::shared_ptr< const Topology > topology, int dim, U &&indices, V &&values)
	Create a MeshTag from entities of given dimension on a mesh.
	MeshTags (const MeshTags &tags)=default
	Copy constructor.
	MeshTags (MeshTags &&tags)=default
	Move constructor.
	~MeshTags ()=default
	Destructor.
MeshTags &	operator= (const MeshTags &tags)=default
	Move assignment.
MeshTags &	operator= (MeshTags &&tags)=default
	Move assignment.
std::vector< std::int32_t >	find (const T value) const
	Find all entities with a given tag value.
std::span< const std::int32_t >	indices () const
std::span< const T >	values () const
	Values attached to topology entities.
int	dim () const
	Return topological dimension of tagged entities.
std::shared_ptr< const Topology >	topology () const
	Return topology.

Public Attributes
std::string	name = "mesh_tags"
	Name.

Detailed Description

template<typename T>
class dolfinx::mesh::MeshTags< T >

MeshTags associate values with mesh topology entities.

The entity index (local to process) identifies the entity. MeshTags is a sparse data storage class; it allows tags to be associated with an arbitrary subset of mesh entities. An entity can have only one associated tag.

Template Parameters

Type

Constructor & Destructor Documentation

MeshTags()

template<typename T >

template<typename U , typename V >
requires std::is_convertible_v<std::remove_cvref_t<U>, std::vector<std::int32_t>> and std::is_convertible_v<std::remove_cvref_t<V>, std::vector<T>>

MeshTags ( std::shared_ptr< const Topology > topology, int dim, U && indices, V && values )

inline

Create a MeshTag from entities of given dimension on a mesh.

Parameters

[in]	topology	Mesh topology on which the tags are associated.
[in]	dim	Topological dimension of mesh entities to tag.
[in]	indices	List of entity indices (indices local to the process).
[in]	values	List of values for each index in indices. The size must be equal to the size of indices.

Precondition

indices must be sorted and unique.

Member Function Documentation

find()

template<typename T >

std::vector< std::int32_t > find ( const T value ) const

inline

Find all entities with a given tag value.

Parameters

[in]

value

The value

Returns

Indices of tagged entities. The indices are sorted.

indices()

template<typename T >

std::span< const std::int32_t > indices ( ) const

inline

Indices of tagged topology entities (local-to-process). The indices are sorted.

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

• /__w/dolfinx/dolfinx/cpp/dolfinx/io/XDMFFile.h
• /__w/dolfinx/dolfinx/cpp/dolfinx/mesh/MeshTags.h