LinearAlgebra::TpetraWrappers::SparsityPatternIterators::Accessor< MemorySpace > Class Template Reference

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

Inheritance diagram for LinearAlgebra::TpetraWrappers::SparsityPatternIterators::Accessor< MemorySpace >:

Public Types
using	size_type = ::types::global_dof_index

Public Member Functions
	Accessor (const SparsityPattern< MemorySpace > *sparsity_pattern, const size_type row, const size_type index)
size_type	row () const
size_type	index () const
size_type	column () const

Static Public Member Functions
static ::ExceptionBase &	ExcBeyondEndOfSparsityPattern ()
static ::ExceptionBase &	ExcAccessToNonlocalRow (size_type arg1, size_type arg2, size_type arg3)

Private Member Functions
void	visit_present_row ()

Private Attributes
SparsityPattern< MemorySpace > *	sparsity_pattern
size_type	a_row
size_type	a_index
std::shared_ptr< std::vector<::types::signed_global_dof_index > >	colnum_cache

Friends
class	Iterator< MemorySpace >

Detailed Description

template<typename MemorySpace = ::MemorySpace::Host>
class LinearAlgebra::TpetraWrappers::SparsityPatternIterators::Accessor< MemorySpace >

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. It does not allow modifying the sparsity pattern itself.

Definition at line 84 of file trilinos_tpetra_sparsity_pattern.h.

Member Typedef Documentation

size_type

template<typename MemorySpace = ::MemorySpace::Host>

using LinearAlgebra::TpetraWrappers::SparsityPatternIterators::Accessor< MemorySpace >::size_type = ::types::global_dof_index

Declare type for container size.

Definition at line 90 of file trilinos_tpetra_sparsity_pattern.h.

Constructor & Destructor Documentation

Accessor()

template<typename MemorySpace = ::MemorySpace::Host>

LinearAlgebra::TpetraWrappers::SparsityPatternIterators::Accessor< MemorySpace >::Accessor	(	const SparsityPattern< MemorySpace > *	sparsity_pattern,
		const size_type	row,
		const size_type	index )

Constructor.

Member Function Documentation

row()

template<typename MemorySpace = ::MemorySpace::Host>

size_type LinearAlgebra::TpetraWrappers::SparsityPatternIterators::Accessor< MemorySpace >::row

(

)

const

Row number of the element represented by this object.

index()

template<typename MemorySpace = ::MemorySpace::Host>

size_type LinearAlgebra::TpetraWrappers::SparsityPatternIterators::Accessor< MemorySpace >::index

(

)

const

Index in row of the element represented by this object.

column()

template<typename MemorySpace = ::MemorySpace::Host>

size_type LinearAlgebra::TpetraWrappers::SparsityPatternIterators::Accessor< MemorySpace >::column

(

)

const

Column number of the element represented by this object.

visit_present_row()

template<typename MemorySpace >

void LinearAlgebra::TpetraWrappers::SparsityPatternIterators::Accessor< MemorySpace >::visit_present_row ( )

private

Discard the old row caches (they may still be used by other accessors) and generate new ones for the row pointed to presently by this accessor.

Definition at line 40 of file trilinos_tpetra_sparsity_pattern.cc.

Friends And Related Symbol Documentation

Iterator< MemorySpace >

template<typename MemorySpace = ::MemorySpace::Host>

friend class Iterator< MemorySpace >

friend

Definition at line 171 of file trilinos_tpetra_sparsity_pattern.h.

Member Data Documentation

sparsity_pattern

template<typename MemorySpace = ::MemorySpace::Host>

SparsityPattern<MemorySpace>* LinearAlgebra::TpetraWrappers::SparsityPatternIterators::Accessor< MemorySpace >::sparsity_pattern

private

The matrix accessed.

Definition at line 138 of file trilinos_tpetra_sparsity_pattern.h.

a_row

template<typename MemorySpace = ::MemorySpace::Host>

size_type LinearAlgebra::TpetraWrappers::SparsityPatternIterators::Accessor< MemorySpace >::a_row

private

Current row number.

Definition at line 143 of file trilinos_tpetra_sparsity_pattern.h.

a_index

template<typename MemorySpace = ::MemorySpace::Host>

size_type LinearAlgebra::TpetraWrappers::SparsityPatternIterators::Accessor< MemorySpace >::a_index

private

Current index in row.

Definition at line 148 of file trilinos_tpetra_sparsity_pattern.h.

colnum_cache

template<typename MemorySpace = ::MemorySpace::Host>

std::shared_ptr<std::vector<::types::signed_global_dof_index> > LinearAlgebra::TpetraWrappers::SparsityPatternIterators::Accessor< MemorySpace >::colnum_cache

private

Cache where we store the column indices of the present row. This is necessary, since Trilinos makes access to the elements of its matrices rather hard, and it is much more efficient to copy all column entries of a row once when we enter it than repeatedly asking Trilinos for individual ones. This also makes some sense since it is likely that we will access them sequentially anyway.

In order to make copying of iterators/accessor of acceptable performance, we keep a shared pointer to these entries so that more than one accessor can access this data if necessary.

Definition at line 163 of file trilinos_tpetra_sparsity_pattern.h.

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

• include/deal.II/lac/trilinos_tpetra_sparsity_pattern.h
• source/lac/trilinos_tpetra_sparsity_pattern.cc