SparsityPatternIterators::Accessor Class Reference

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

Inheritance diagram for SparsityPatternIterators::Accessor:

Public Types
using	size_type = SparsityPatternIterators::size_type

Public Member Functions
	Accessor (const SparsityPatternBase *matrix, const std::size_t linear_index)
	Accessor (const SparsityPatternBase *matrix)
	Accessor ()
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

Friends
class	LinearIndexIterator< Iterator, Accessor >
class	ChunkSparsityPatternIterators::Accessor

Detailed Description

Accessor class for iterators into sparsity patterns. This class is also the base class for both const and non-const accessor classes into sparse matrices.

Note that this class only allows read access to elements, providing their row and column number (or alternatively the index within the complete sparsity pattern). It does not allow modifying the sparsity pattern itself.

Author

Wolfgang Bangerth

Date

2004

Definition at line 132 of file sparsity_pattern.h.

Member Typedef Documentation

size_type

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

Size type of SparsityPattern.

Definition at line 138 of file sparsity_pattern.h.

Constructor & Destructor Documentation

Accessor() [1/3]

SparsityPatternIterators::Accessor::Accessor	(	const SparsityPatternBase *	matrix,
		const std::size_t	linear_index
	)

Constructor.

Accessor() [2/3]

SparsityPatternIterators::Accessor::Accessor

(

const SparsityPatternBase *

matrix

)

Constructor. Construct the end accessor for the given sparsity pattern.

Accessor() [3/3]

SparsityPatternIterators::Accessor::Accessor

(

)

Default constructor creating a dummy accessor. This constructor is here only to be able to store accessors in STL containers such as std::vector.

Member Function Documentation

row()

size_type SparsityPatternIterators::Accessor::row

(

)

const

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

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

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

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

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

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

operator<()

bool SparsityPatternIterators::Accessor::operator<

(

const Accessor &

)

const

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 ( )

protected

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

Friends And Related Function Documentation

LinearIndexIterator< Iterator, Accessor >

friend class LinearIndexIterator< Iterator, Accessor >

friend

Grant access to iterator class.

Definition at line 249 of file sparsity_pattern.h.

ChunkSparsityPatternIterators::Accessor

friend class ChunkSparsityPatternIterators::Accessor

friend

Grant access to accessor class of ChunkSparsityPattern.

Definition at line 254 of file sparsity_pattern.h.

Member Data Documentation

container

const SparsityPatternBase* SparsityPatternIterators::Accessor::container

protected

The sparsity pattern we operate on accessed.

Definition at line 229 of file sparsity_pattern.h.

linear_index

std::size_t SparsityPatternIterators::Accessor::linear_index

protected

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 238 of file sparsity_pattern.h.

---

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

• deal.II/lac/sparsity_pattern.h