InvalidAccessor< structdim, dim, spacedim > Class Template Reference

#include <deal.II/grid/tria_accessor.h>

Inheritance diagram for InvalidAccessor< structdim, dim, spacedim >:

Public Types
using	AccessorData = void

Public Member Functions
	InvalidAccessor (const void *parent=nullptr, const int level=-1, const int index=-1, const AccessorData *local_data=nullptr)
	InvalidAccessor (const InvalidAccessor &)
template<typename OtherAccessor >
	InvalidAccessor (const OtherAccessor &)
void	copy_from (const InvalidAccessor &)
bool	operator== (const InvalidAccessor &) const
bool	operator!= (const InvalidAccessor &) const
void	operator++ () const
void	operator-- () const
bool	used () const
bool	has_children () const
types::manifold_id	manifold_id () const
unsigned int	user_index () const
void	set_user_index (const unsigned int p) const
void	set_manifold_id (const types::manifold_id) const
Point< spacedim > &	vertex (const unsigned int i) const
void *	line (const unsigned int i) const
void *	quad (const unsigned int i) const

Static Public Member Functions
static IteratorState::IteratorStates	state ()
static int	level ()
static int	index ()

Static Public Attributes
static constexpr unsigned int	space_dimension = spacedim
static constexpr unsigned int	dimension = dim
static const unsigned int	structure_dimension = structdim

Detailed Description

template<int structdim, int dim, int spacedim = dim>
class InvalidAccessor< structdim, dim, spacedim >

A class that represents accessor objects to iterators that don't make sense such as quad iterators in on 1d meshes. This class can not be used to create objects (it will in fact throw an exception if this should ever be attempted but it sometimes allows code to be written in a simpler way in a dimension independent way. For example, it allows to write code that works on quad iterators that is dimension independent – i.e., also compiles in 1d – because quad iterators (via the current class) exist and are syntactically correct. You can not expect, however, to ever create an actual object of one of these iterators in 1d, meaning you need to expect to wrap the code block in which you use quad iterators into something like if (dim>1) – which makes eminent sense anyway.

This class provides the minimal interface necessary for Accessor classes to interact with Iterator classes. However, this is only for syntactic correctness, none of the functions do anything but generate errors.

Definition at line 573 of file tria_accessor.h.

Member Typedef Documentation

AccessorData

template<int structdim, int dim, int spacedim = dim>

using InvalidAccessor< structdim, dim, spacedim >::AccessorData = void

Declare the data type that this accessor class expects to get passed from the iterator classes. Since the pure triangulation iterators need no additional data, this data type is void.

Definition at line 603 of file tria_accessor.h.

Constructor & Destructor Documentation

InvalidAccessor() [1/3]

template<int structdim, int dim, int spacedim = dim>

InvalidAccessor< structdim, dim, spacedim >::InvalidAccessor	(	const void *	parent = nullptr,
		const int	level = -1,
		const int	index = -1,
		const AccessorData *	local_data = nullptr
	)

Constructor. This class is used for iterators that do not make sense in a given dimension, for example quads for 1d meshes. Consequently, while the creation of such objects is syntactically valid, they make no semantic sense, and we generate an exception when such an object is actually generated.

InvalidAccessor() [2/3]

template<int structdim, int dim, int spacedim = dim>

InvalidAccessor< structdim, dim, spacedim >::InvalidAccessor

(

const InvalidAccessor< structdim, dim, spacedim > &

)

Copy constructor. This class is used for iterators that do not make sense in a given dimension, for example quads for 1d meshes. Consequently, while the creation of such objects is syntactically valid, they make no semantic sense, and we generate an exception when such an object is actually generated.

InvalidAccessor() [3/3]

template<int structdim, int dim, int spacedim>

template<typename OtherAccessor >

InvalidAccessor< structdim, dim, spacedim >::InvalidAccessor

(

const OtherAccessor &

)

Conversion from other accessors to the current invalid one. This of course also leads to a run-time error.

Definition at line 4241 of file tria_accessor.h.

Member Function Documentation

copy_from()

template<int structdim, int dim, int spacedim = dim>

void InvalidAccessor< structdim, dim, spacedim >::copy_from

(

const InvalidAccessor< structdim, dim, spacedim > &

)

Dummy copy operation.

operator==()

template<int structdim, int dim, int spacedim = dim>

bool InvalidAccessor< structdim, dim, spacedim >::operator==

(

const InvalidAccessor< structdim, dim, spacedim > &

)

const

Dummy comparison operators.

operator!=()

template<int structdim, int dim, int spacedim = dim>

bool InvalidAccessor< structdim, dim, spacedim >::operator!=

(

const InvalidAccessor< structdim, dim, spacedim > &

)

const

operator++()

template<int structdim, int dim, int spacedim = dim>

void InvalidAccessor< structdim, dim, spacedim >::operator++

(

)

const

Dummy operators to make things compile. Does nothing.

operator--()

template<int structdim, int dim, int spacedim = dim>

void InvalidAccessor< structdim, dim, spacedim >::operator--

(

)

const

state()

template<int structdim, int dim, int spacedim>

IteratorState::IteratorStates InvalidAccessor< structdim, dim, spacedim >::state ( )

static

Return the state of the iterator. For the different states an accessor can be in, refer to the TriaRawIterator documentation.

Definition at line 3478 of file tria_accessor.cc.

level()

template<int structdim, int dim, int spacedim>

int InvalidAccessor< structdim, dim, spacedim >::level ( )

static

Level of this object. Vertices have no level, so this function always returns zero.

Definition at line 3487 of file tria_accessor.cc.

index()

template<int structdim, int dim, int spacedim>

int InvalidAccessor< structdim, dim, spacedim >::index ( )

static

Index of this object. Returns the global index of the vertex this object points to.

Definition at line 3496 of file tria_accessor.cc.

used()

template<int structdim, int dim, int spacedim = dim>

bool InvalidAccessor< structdim, dim, spacedim >::used

(

)

const

Dummy function representing whether the accessor points to a used or an unused object.

has_children()

template<int structdim, int dim, int spacedim = dim>

bool InvalidAccessor< structdim, dim, spacedim >::has_children

(

)

const

Dummy function representing whether the accessor points to an object that has children.

manifold_id()

template<int structdim, int dim, int spacedim = dim>

types::manifold_id InvalidAccessor< structdim, dim, spacedim >::manifold_id

(

)

const

Dummy function that always returns numbers::flat_manifold_id.

user_index()

template<int structdim, int dim, int spacedim = dim>

unsigned int InvalidAccessor< structdim, dim, spacedim >::user_index

(

)

const

Dummy function that always returns numbers::invalid_unsigned_int.

set_user_index()

template<int structdim, int dim, int spacedim = dim>

void InvalidAccessor< structdim, dim, spacedim >::set_user_index

(

const unsigned int

p

)

const

Dummy function that always throws.

set_manifold_id()

template<int structdim, int dim, int spacedim = dim>

void InvalidAccessor< structdim, dim, spacedim >::set_manifold_id

(

const types::manifold_id

)

const

Dummy function that always throws.

vertex()

template<int structdim, int dim, int spacedim = dim>

Point< spacedim > & InvalidAccessor< structdim, dim, spacedim >::vertex

(

const unsigned int

i

)

const

Dummy function to extract vertices. Returns the origin.

line()

template<int structdim, int dim, int spacedim = dim>

void * InvalidAccessor< structdim, dim, spacedim >::line

(

const unsigned int

i

)

const

Dummy function to extract lines. Returns a default-constructed line iterator.

quad()

template<int structdim, int dim, int spacedim = dim>

void * InvalidAccessor< structdim, dim, spacedim >::quad

(

const unsigned int

i

)

const

Dummy function to extract quads. Returns a default-constructed quad iterator.

Member Data Documentation

space_dimension

template<int structdim, int dim, int spacedim = dim>

constexpr unsigned int InvalidAccessor< structdim, dim, spacedim >::space_dimension = spacedim

staticconstexpr

Dimension of the space the object represented by this accessor lives in. For example, if this accessor represents a quadrilateral that is part of a two-dimensional surface in four-dimensional space, then this value is four.

Definition at line 582 of file tria_accessor.h.

dimension

template<int structdim, int dim, int spacedim = dim>

constexpr unsigned int InvalidAccessor< structdim, dim, spacedim >::dimension = dim

staticconstexpr

Dimensionality of the object that the thing represented by this accessor is part of. For example, if this accessor represents a line that is part of a hexahedron, then this value will be three.

Definition at line 589 of file tria_accessor.h.

structure_dimension

template<int structdim, int dim, int spacedim = dim>

const unsigned int InvalidAccessor< structdim, dim, spacedim >::structure_dimension = structdim

static

Dimensionality of the current object represented by this accessor. For example, if it is line (irrespective of whether it is part of a 2d or 3d subobject), then this value equals 1.

Definition at line 596 of file tria_accessor.h.

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

• include/deal.II/grid/tria_accessor.h
• source/grid/tria_accessor.cc