TrilinosWrappers::SparseMatrixIterators::AccessorBase Class Reference

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

Inheritance diagram for TrilinosWrappers::SparseMatrixIterators::AccessorBase:

Public Types
using	size_type = ::types::global_dof_index

Public Member Functions
	AccessorBase (SparseMatrix *matrix, const size_type row, const size_type index)
size_type	row () const
size_type	index () const
size_type	column () const

Protected Member Functions
void	visit_present_row ()

Protected Attributes
SparseMatrix *	matrix
size_type	a_row
size_type	a_index
std::shared_ptr< std::vector< size_type > >	colnum_cache
std::shared_ptr< std::vector< TrilinosScalar > >	value_cache

Detailed Description

Handling of indices for both constant and non constant Accessor objects

For a regular SparseMatrix, we would use an accessor for the sparsity pattern. For Trilinos matrices, this does not seem so simple, therefore, we write a little base class here.

Author

Guido Kanschat

Date

2012

Definition at line 109 of file trilinos_sparse_matrix.h.

Member Typedef Documentation

size_type

using TrilinosWrappers::SparseMatrixIterators::AccessorBase::size_type = ::types::global_dof_index

Declare the type for container size.

Definition at line 115 of file trilinos_sparse_matrix.h.

Constructor & Destructor Documentation

AccessorBase()

TrilinosWrappers::SparseMatrixIterators::AccessorBase::AccessorBase	(	SparseMatrix *	matrix,
		const size_type	row,
		const size_type	index
	)

Constructor.

Member Function Documentation

row()

size_type TrilinosWrappers::SparseMatrixIterators::AccessorBase::row

(

)

const

Row number of the element represented by this object.

index()

size_type TrilinosWrappers::SparseMatrixIterators::AccessorBase::index

(

)

const

Index in row of the element represented by this object.

column()

size_type TrilinosWrappers::SparseMatrixIterators::AccessorBase::column

(

)

const

Column number of the element represented by this object.

visit_present_row()

void TrilinosWrappers::SparseMatrixIterators::AccessorBase::visit_present_row ( )

protected

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 145 of file trilinos_sparse_matrix.cc.

Member Data Documentation

matrix

SparseMatrix* TrilinosWrappers::SparseMatrixIterators::AccessorBase::matrix

mutableprotected

Pointer to the matrix object. This object should be handled as a const pointer or non-const by the appropriate derived classes. In order to be able to implement both, it is not const here, so handle with care!

Definition at line 149 of file trilinos_sparse_matrix.h.

a_row

size_type TrilinosWrappers::SparseMatrixIterators::AccessorBase::a_row

protected

Current row number.

Definition at line 153 of file trilinos_sparse_matrix.h.

a_index

size_type TrilinosWrappers::SparseMatrixIterators::AccessorBase::a_index

protected

Current index in row.

Definition at line 158 of file trilinos_sparse_matrix.h.

colnum_cache

std::shared_ptr<std::vector<size_type> > TrilinosWrappers::SparseMatrixIterators::AccessorBase::colnum_cache

protected

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 180 of file trilinos_sparse_matrix.h.

value_cache

std::shared_ptr<std::vector<TrilinosScalar> > TrilinosWrappers::SparseMatrixIterators::AccessorBase::value_cache

protected

Cache for the values of this row.

Definition at line 185 of file trilinos_sparse_matrix.h.

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

• deal.II/lac/trilinos_sparse_matrix.h
• source/lac/trilinos_sparse_matrix.cc