Dune::Entity< cd, dim, GridImp, EntityImp > Class Template Reference

Wrapper class for entities. More...

#include <dune/grid/common/entity.hh>

Public Types
typedef EntityImp< cd, dim, GridImp >	Implementation
	type of underlying implementation More...

Public Member Functions
Implementation &	impl ()
	access to the underlying implementation More...
const Implementation &	impl () const
	access to the underlying implementation More...

Related Functions
(Note that these are not member functions.)
template<int cd, int dim, class GridImp , template< int, int, class > class EntityImp>
auto	referenceElement (const Entity< cd, dim, GridImp, EntityImp > &entity) -> decltype(referenceElement< typename GridImp::ctype, GridImp::template Codim< cd >::Geometry::mydimension >(entity.type()))
	Second-level dispatch to select the correct reference element for a grid entity. More...

Exported types and constants
typedef GridImp::template Codim< cd >::Geometry	Geometry
	The corresponding geometry type.
typedef GridImp::template Codim< cd >::EntitySeed	EntitySeed
	The corresponding entity seed (for storage of entities)
static constexpr int	codimension = cd
	Know your own codimension.
static constexpr int	dimension = dim
	Know the grid dimension.
static constexpr int	mydimension = dim - cd
	Dimensionality of the reference element of the entity.

Methods shared by entities of all codimensions
int	level () const
	The level of this entity.
PartitionType	partitionType () const
	Partition type of this entity.
Geometry	geometry () const
	obtain geometric realization of the entity More...
GeometryType	type () const
	Return the name of the reference element. The type can be used to access the Dune::ReferenceElement.
unsigned int	subEntities (unsigned int codim) const
	Number of subentities for a given codimension. More...
EntitySeed	seed () const
	Return the entity seed which contains sufficient information to generate the entity again and uses as little memory as possible.
bool	operator== (const Entity &other) const
	Compares two entities for equality.
bool	operator!= (const Entity &other) const
	Compares two entities for inequality.
	Entity ()
	Entity (const Entity &other)
	Copy constructor from an existing entity.
	Entity (Entity &&other)
	Move constructor from an existing entity.
Entity &	operator= (const Entity &other)
	Copy assignment operator from an existing entity.
Entity &	operator= (Entity &&other)
	Move assignment operator from an existing entity.

Interface for the implementor
	Entity (const EntityImp< cd, dim, GridImp > &e)
	Copy constructor from EntityImp.
	Entity (EntityImp< cd, dim, GridImp > &&e)
	Move constructor from EntityImp.

Intersection Range
Iterator range for intersections .
template<typename GV , typename Entity >
IteratorRange<... >	intersections (const GV &gv, const Entity &e)
	Iterates over all Intersections of an Entity with respect to the given GridView. More...

Hierarchic Entity range
Iterator range for hierarchic access to the more-refined entities that result from the subdivision of a given element.
template<typename Entity >
IteratorRange<... >	descendantElements (const Entity &e, int maxLevel)
	Iterates over all descendant elements of the given element up to a maximum level. More...

Generic entity ranges for non-standard parallel partitions
These Entity ranges allow for the maximum flexibility; they are parameterized on both the co(cimension) and the parallel PartitionSet.
template<typename E , int codim>
IteratorRange<... >	subEntities (const E &e, Codim< codim > c)
	Iterates over all sub-entities of an entity given the codimension of the sub-entities. More...

Detailed Description

template<int cd, int dim, class GridImp, template< int, int, class > class EntityImp>
class Dune::Entity< cd, dim, GridImp, EntityImp >

Wrapper class for entities.

Template Parameters

cd	Codimension of the entity
dim	Dimension of the grid
GridImp	Type that is a model of Dune::Grid
EntityImp	Class template that is a model of Dune::Entity

Engine Concept

This class wraps a object of type EntityImp and forwards all member function calls to corresponding members of this class. In that sense Entity defines the interface and EntityImp supplies the implementation. For various reasons we do not use an inheritance hierarchy and the Barton-Nackman trick here.

Specialization

The Entity class template is specialized for cd=0 (elements, Dune::Entity<0,dim,GridImp,EntityImp>). This case has an extended interface. The methods defined in the general template are provided by the specialization as well. We did not use inheritance because different implementations for different codimensions may be required and virtual functions had to be avoided.

View concept

Entities can not be created, assigned or otherwise modified outside the interface in the user code. They are only accessible by immutable iterators provided on the corresponding grid class.

The only way to modify the entities of a grid is through grid adaptation which consists of tagging entities (of codimension 0) for refinement and then calling the adapt() method on the grid.

Member Typedef Documentation

Implementation

template<int cd, int dim, class GridImp , template< int, int, class > class EntityImp>

typedef EntityImp< cd, dim, GridImp > Dune::Entity< cd, dim, GridImp, EntityImp >::Implementation

type of underlying implementation

Warning

Implementation details may change without prior notification.

Member Function Documentation

geometry()

template<int cd, int dim, class GridImp , template< int, int, class > class EntityImp>

Geometry Dune::Entity< cd, dim, GridImp, EntityImp >::geometry ( ) const

inline

obtain geometric realization of the entity

Each entity provides an object of type Dune::Geometry< dimension-codimension, dimensionworld, ... > that represents the map from a reference element to world coordinates.

Note

Previously, the geometry was encapsulated in the entity object and a const reference was returned.

The returned geometry object is guaranteed to remain valid until the grid is modified (or deleted).

impl() [1/2]

template<int cd, int dim, class GridImp , template< int, int, class > class EntityImp>

Implementation & Dune::Entity< cd, dim, GridImp, EntityImp >::impl ( )

inline

access to the underlying implementation

Warning

Implementation details may change without prior notification.

Referenced by Dune::IdentityGrid< HostGrid >::getHostEntity(), Dune::GridDefaultImplementation< dim, dimworld, ct, GridFamily >::ileafbegin(), Dune::GridDefaultImplementation< dim, dimworld, ct, GridFamily >::ileafend(), Dune::GridDefaultImplementation< dim, dimworld, ct, GridFamily >::ilevelbegin(), and Dune::GridDefaultImplementation< dim, dimworld, ct, GridFamily >::ilevelend().

impl() [2/2]

template<int cd, int dim, class GridImp , template< int, int, class > class EntityImp>

const Implementation & Dune::Entity< cd, dim, GridImp, EntityImp >::impl ( ) const

inline

access to the underlying implementation

Warning

Implementation details may change without prior notification.

subEntities()

template<int cd, int dim, class GridImp , template< int, int, class > class EntityImp>

unsigned int Dune::Entity< cd, dim, GridImp, EntityImp >::subEntities ( unsigned int  codim ) const

inline

Number of subentities for a given codimension.

Parameters

codim

codimension to obtain number of subentities for

Note

The codimension is specified with respect to the grid dimension.

Unless the geometry type is None, this method is redundant and the same information can be obtained from the corresponding reference element.

Friends And Related Function Documentation

referenceElement()

template<int cd, int dim, class GridImp , template< int, int, class > class EntityImp>

auto referenceElement ( const Entity< cd, dim, GridImp, EntityImp > &  entity ) -> decltype(referenceElement<typename GridImp::ctype,GridImp::template Codim<cd>::Geometry::mydimension>(entity.type()))

related

Second-level dispatch to select the correct reference element for a grid entity.

This function is the default implementation of the second-level reference element dispatch performed by Entity.

When referenceElement() is called with an Entity, it will forward the call to referenceElement<ctype, mydim>(const GeometryType&). This default implementation will do the right thing as long as your geometry is based on a standard Dune ReferenceElement. If it is not and you want to supply your own reference element implementation, provide an override of this function for your specific geometry implementation.

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

• dune/grid/common/entity.hh
• dune/grid/common/rangegenerators.hh