Unique label for each type of entities that can occur in DUNE grids. More...

#include <dune/geometry/type.hh>

Public Types
enum	BasicType { simplex , cube , pyramid , prism , extended , none }
	Each entity can be tagged by one of these basic types plus its space dimension. More...

using	Id = IdType
	An integral id representing a GeometryType. More...

Public Member Functions
constexpr	operator Id () const
	Construct an Id representing this GeometryType. More...

constexpr Id	toId () const
	Create an Id representation of this GeometryType. More...

constexpr	GeometryType (Id id)
	Reconstruct a Geometry type from a GeometryType::Id. More...

Constructors
constexpr	GeometryType ()
	Default constructor, not initializing anything.

constexpr	GeometryType (unsigned int topologyId, unsigned int dim, bool isNone)
	Constructor, using the topologyId (integer), the dimension and a flag for type none. More...

constexpr	GeometryType (unsigned int topologyId, unsigned int dim)
	Constructor, using the topologyId (integer) and the dimension. More...

template<class TopologyType , class = std::void_t<decltype(TopologyType::dimension), decltype(TopologyType::id)>>
	GeometryType (TopologyType t)
	Constructor from static TopologyType class. More...

Query Methods
constexpr bool	isVertex () const
	Return true if entity is a vertex.

constexpr bool	isLine () const
	Return true if entity is a line segment.

constexpr bool	isTriangle () const
	Return true if entity is a triangle.

constexpr bool	isQuadrilateral () const
	Return true if entity is a quadrilateral.

constexpr bool	isTetrahedron () const
	Return true if entity is a tetrahedron.

constexpr bool	isPyramid () const
	Return true if entity is a pyramid.

constexpr bool	isPrism () const
	Return true if entity is a prism.

constexpr bool	isHexahedron () const
	Return true if entity is a hexahedron.

constexpr bool	isSimplex () const
	Return true if entity is a simplex of any dimension.

constexpr bool	isCube () const
	Return true if entity is a cube of any dimension.

constexpr bool	isConical () const
	Return true if entity was constructed with a conical product in the last step.

constexpr bool	isConical (const int &step) const
	Return true if entity was constructed with a conical product in the chosen step. More...

constexpr bool	isPrismatic () const
	Return true if entity was constructed with a prismatic product in the last step.

constexpr bool	isPrismatic (const int &step) const
	Return true if entity was constructed with a prismatic product in the chosen step. More...

constexpr bool	isNone () const
	Return true if entity is a singular of any dimension.

constexpr unsigned int	dim () const
	Return dimension of the type.

constexpr unsigned int	id () const
	Return the topology id of the type.

Comparison operators
constexpr bool	operator== (const GeometryType &other) const
	Check for equality. This method knows that in dimension 0 and 1 all BasicTypes are equal.

constexpr bool	operator!= (const GeometryType &other) const
	Check for inequality.

constexpr bool	operator< (const GeometryType &other) const
	less-than operation for use with maps

Detailed Description

Unique label for each type of entities that can occur in DUNE grids.

This class has to be extended if a grid implementation with new entity types is added to DUNE.

GeometryType is a C++ "literal type" and can be used in constexpr context if created with a constexpr constructor.

If you want to use a GeometryType as a template parameter, see GeometryType::Id.

Member Typedef Documentation

◆ Id

using Dune::GeometryType::Id = IdType

An integral id representing a GeometryType.

Id is an unspecified built-in integral type that uniquely represents a GeometryType. It mostly exists to be able to use a geometry type as a template parameter, as C++ does not let us use GeometryType directly for this purpose.

GeometryType and GeometryType::Id are implicitly convertible to each other, while the Id does not implicitly convert into other integral types. They should be used as follows:

// define a template with a GeometryType::Id parameter
template<GeometryType::Id gtid>
class Foo
{
  // reconstruct a full-blown constexpr GeometryType as needed to access
  // information like the dimension etc.
  static constexpr GeometryType gt = gtid;
};
 
// Instantiate a Foo template
Foo<GeometryTypes::triangle> foo;

As you can see, the conversion between GeometryType and the id is completely transparent to the user (apart from the slightly different template parameter type).

Note: The Id really only exists for this template parameter workaround. Do not use it to store a more compact version of the GeometryType - GeometryType and GeometryType::Id use the same amount of storage (64 bits).

Member Enumeration Documentation

◆ BasicType

enum Dune::GeometryType::BasicType

Each entity can be tagged by one of these basic types plus its space dimension.

Enumerator
simplex	Simplicial element in any nonnegative dimension.
cube	Cube element in any nonnegative dimension.
pyramid	Four sided pyramid in three dimensions.
prism	Prism element in three dimensions.
extended	Other, more general topology, representable as topologyId.
none	Even more general topology, cannot be specified by a topologyId. Two GeometryTypes with 'none' type are equal if and only if they have the same dimension.

Constructor & Destructor Documentation

◆ GeometryType() [1/4]

constexpr Dune::GeometryType::GeometryType ( Id id )

inlineconstexpr

Reconstruct a Geometry type from a GeometryType::Id.

This constructor exists mostly to transparently support using a GeometryType as a template parameter.

See also: Id

◆ GeometryType() [2/4]

constexpr Dune::GeometryType::GeometryType	(	unsigned int	topologyId,
		unsigned int	dim,
		bool	isNone
	)

inlineconstexpr

Constructor, using the topologyId (integer), the dimension and a flag for type none.

Note: With this constructor, you can easily create an invalid GeometryType, it is mostly here for internal use! the TypologyType, users are encouraged to use the GeometryType(TopologyType t) constructor.

◆ GeometryType() [3/4]

constexpr Dune::GeometryType::GeometryType	(	unsigned int	topologyId,
		unsigned int	dim
	)

inlineconstexpr

Constructor, using the topologyId (integer) and the dimension.

Note: the topologyId is a binary encoded representation of the TypologyType, users are encouraged to use the GeometryType(TopologyType t) constructor.

◆ GeometryType() [4/4]

template<class TopologyType , class = std::void_t<decltype(TopologyType::dimension), decltype(TopologyType::id)>>

Dune::GeometryType::GeometryType ( TopologyType t )

inlineexplicit

Constructor from static TopologyType class.

Constructs the GeometryType object from a static topology representation.

Template Parameters

TopologyType A class providing public static unsigned int members TopologyType::dimension and TopologyType::id. You can e.g. use the Point, Prism and Pyramid structs from the Impl namespace.

Parameters

t	Any object of type TopologyType. The object t itself is ignored.

References DUNE_UNUSED_PARAMETER.

Member Function Documentation

◆ isConical()

constexpr bool Dune::GeometryType::isConical ( const int & step ) const

inlineconstexpr

Return true if entity was constructed with a conical product in the chosen step.

Parameters

step	0 <= step <= dim-1

◆ isPrismatic()

constexpr bool Dune::GeometryType::isPrismatic ( const int & step ) const

inlineconstexpr

Return true if entity was constructed with a prismatic product in the chosen step.

Parameters

step	0 <= step <= dim-1

◆ operator Id()

constexpr Dune::GeometryType::operator Id ( ) const

inlineconstexpr

Construct an Id representing this GeometryType.

This constructor exists mostly to transparently support using a GeometryType as a template parameter.

See also: Id

References id().

◆ toId()

constexpr Id Dune::GeometryType::toId ( ) const

inlineconstexpr

Create an Id representation of this GeometryType.

The returned Id encapsulates the whole information of this GeometryType into an enum suitable for being used as template parameter. The GeometryType can be reconstructed from the Id using GeometryType{id}.

This function was mainly introduced to support older GCC versions (<10.2). There the implicit conversion from GeometryType to Id failed if a pure r-value template argument based on a static class member was used. (See dune/geometry/test/test-geometrytype-id.cc)

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

dune/geometry/type.hh

DUNE Distributed and Unified Numerics Environment

DUNE PDELab (git)

Public Types

Public Member Functions

Detailed Description

Member Typedef Documentation

◆ Id

Member Enumeration Documentation

◆ BasicType

Constructor & Destructor Documentation

◆ GeometryType() [1/4]

◆ GeometryType() [2/4]

◆ GeometryType() [3/4]

◆ GeometryType() [4/4]

Member Function Documentation

◆ isConical()

◆ isPrismatic()

◆ operator Id()

◆ toId()