SparseMatrixIterators::Accessor< number, true > Class Template Reference

#include <deal.II/lac/sparse_matrix.h>

Inheritance diagram for SparseMatrixIterators::Accessor< number, true >:

Public Types
using	MatrixType = const SparseMatrix< number >
using	size_type = SparsityPatternIterators::size_type

Public Member Functions
	Accessor (MatrixType *matrix, const std::size_t index_within_matrix)
	Accessor (MatrixType *matrix)
	Accessor (const SparseMatrixIterators::Accessor< number, false > &a)
number	value () const
const MatrixType &	get_matrix () const
size_type	row () const
size_type	index () const
size_type	global_index () const
size_type	column () const
bool	is_valid_entry () const
bool	operator== (const Accessor &) const
bool	operator< (const Accessor &) const

Protected Member Functions
void	advance ()

Static Protected Member Functions
static ::ExceptionBase &	DummyAccessor ()

Protected Attributes
const SparsityPatternBase *	container
std::size_t	linear_index

Private Attributes
MatrixType *	matrix

Friends
template<typename , bool >
class	Iterator

Detailed Description

template<typename number>
class SparseMatrixIterators::Accessor< number, true >

Accessor class for constant matrices, used in the const_iterators. This class builds on the accessor classes used for sparsity patterns to loop over all nonzero entries, and only adds the accessor functions to gain access to the actual value stored at a certain location.

Definition at line 132 of file sparse_matrix.h.

Member Typedef Documentation

MatrixType

template<typename number >

using SparseMatrixIterators::Accessor< number, true >::MatrixType = const SparseMatrix<number>

Typedef for the type (including constness) of the matrix to be used here.

Definition at line 139 of file sparse_matrix.h.

size_type

using SparsityPatternIterators::Accessor::size_type = SparsityPatternIterators::size_type

inherited

Size type of SparsityPattern.

Definition at line 137 of file sparsity_pattern.h.

Constructor & Destructor Documentation

Accessor() [1/3]

template<typename number >

SparseMatrixIterators::Accessor< number, true >::Accessor	(	MatrixType *	matrix,
		const std::size_t	index_within_matrix
	)

Constructor.

Accessor() [2/3]

template<typename number >

SparseMatrixIterators::Accessor< number, true >::Accessor

(

MatrixType *

matrix

)

Constructor. Construct the end accessor for the given matrix.

Accessor() [3/3]

template<typename number >

SparseMatrixIterators::Accessor< number, true >::Accessor

(

const SparseMatrixIterators::Accessor< number, false > &

a

)

Copy constructor to get from a non-const accessor to a const accessor.

Member Function Documentation

value()

template<typename number >

number SparseMatrixIterators::Accessor< number, true >::value

(

)

const

Value of this matrix entry.

get_matrix()

template<typename number >

const MatrixType & SparseMatrixIterators::Accessor< number, true >::get_matrix

(

)

const

Return a reference to the matrix into which this accessor points. Note that in the present case, this is a constant reference.

row()

size_type SparsityPatternIterators::Accessor::row ( ) const

inherited

Row number of the element represented by this object. This function can only be called for entries for which is_valid_entry() is true.

index()

size_type SparsityPatternIterators::Accessor::index ( ) const

inherited

Index within the current row of the element represented by this object. This function can only be called for entries for which is_valid_entry() is true.

global_index()

size_type SparsityPatternIterators::Accessor::global_index ( ) const

inherited

This function returns the how-many'th entry within the entire sparsity pattern the current iterator points to. While the order of entries in a sparsity pattern is generally not important, this function allows indexing entries of the sparsity pattern using a linear index.

This function can only be called for entries for which is_valid_entry() is true.

column()

size_type SparsityPatternIterators::Accessor::column ( ) const

inherited

Column number of the element represented by this object. This function can only be called for entries for which is_valid_entry() is true.

is_valid_entry()

bool SparsityPatternIterators::Accessor::is_valid_entry ( ) const

inherited

Return whether the sparsity pattern entry pointed to by this iterator is valid or not. Note that after compressing the sparsity pattern, all entries are valid. However, before compression, the sparsity pattern allocated some memory to be used while still adding new nonzero entries; if you create iterators in this phase of the sparsity pattern's lifetime, you will iterate over elements that are not valid. If this is so, then this function will return false.

operator==()

bool SparsityPatternIterators::Accessor::operator== ( const Accessor &  ) const

inherited

Comparison. True, if both iterators point to the same matrix position.

operator<()

bool SparsityPatternIterators::Accessor::operator< ( const Accessor &  ) const

inherited

Comparison operator. Result is true if either the first row number is smaller or if the row numbers are equal and the first index is smaller.

This function is only valid if both iterators point into the same sparsity pattern.

advance()

void SparsityPatternIterators::Accessor::advance ( )

protectedinherited

Move the accessor to the next nonzero entry in the matrix.

Friends And Related Function Documentation

Iterator

template<typename number >

template<typename , bool >

friend class Iterator

friend

Definition at line 182 of file sparse_matrix.h.

Member Data Documentation

matrix

template<typename number >

MatrixType* SparseMatrixIterators::Accessor< number, true >::matrix

private

Pointer to the matrix we use.

Definition at line 173 of file sparse_matrix.h.

container

const SparsityPatternBase* SparsityPatternIterators::Accessor::container

protectedinherited

The sparsity pattern we operate on accessed.

Definition at line 228 of file sparsity_pattern.h.

linear_index

std::size_t SparsityPatternIterators::Accessor::linear_index

protectedinherited

Index in global sparsity pattern. This index represents the location the iterator/accessor points to within the array of the SparsityPattern class that stores the column numbers. It is also the index within the values array of a sparse matrix that stores the corresponding value of this site.

Definition at line 237 of file sparsity_pattern.h.

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

• include/deal.II/lac/sparse_matrix.h