Reference documentation for deal.II version 9.6.2
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LinearAlgebra::TpetraWrappers::SparseMatrixIterators::Accessor< Number, MemorySpace, false > Class Template Reference

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

Inheritance diagram for LinearAlgebra::TpetraWrappers::SparseMatrixIterators::Accessor< Number, MemorySpace, false >:

Classes

class  Reference

Public Types

using MatrixType = SparseMatrix<Number, MemorySpace>
using size_type = typename AccessorBase<Number, MemorySpace>::size_type
using size_type

Public Member Functions

 Accessor (MatrixType *matrix, const size_type row, const size_type index)
Reference value () const
size_type row () const
size_type index () const
size_type column () const

Protected Member Functions

void visit_present_row ()

Protected Attributes

SparseMatrix< Number, MemorySpace > * matrix
size_type a_row
size_type a_index
std::shared_ptr< std::vector<::types::signed_global_dof_index > > colnum_cache
std::shared_ptr< std::vector< Number > > value_cache

Friends

class Reference

Detailed Description

template<typename Number, typename MemorySpace>
class LinearAlgebra::TpetraWrappers::SparseMatrixIterators::Accessor< Number, MemorySpace, false >

The specialization for a mutable Accessor.

Definition at line 1453 of file trilinos_tpetra_sparse_matrix.h.

Member Typedef Documentation

◆ MatrixType

template<typename Number, typename MemorySpace>
using LinearAlgebra::TpetraWrappers::SparseMatrixIterators::Accessor< Number, MemorySpace, false >::MatrixType = SparseMatrix<Number, MemorySpace>

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

Definition at line 1512 of file trilinos_tpetra_sparse_matrix.h.

◆ size_type [1/2]

template<typename Number, typename MemorySpace>
using LinearAlgebra::TpetraWrappers::SparseMatrixIterators::Accessor< Number, MemorySpace, false >::size_type = typename AccessorBase<Number, MemorySpace>::size_type

Typedef for the size type of the matrix to be used here.

Definition at line 1517 of file trilinos_tpetra_sparse_matrix.h.

◆ size_type [2/2]

Declare the type for container size.

Definition at line 1304 of file trilinos_tpetra_sparse_matrix.h.

Constructor & Destructor Documentation

◆ Accessor()

template<typename Number, typename MemorySpace>
LinearAlgebra::TpetraWrappers::SparseMatrixIterators::Accessor< Number, MemorySpace, false >::Accessor ( MatrixType * matrix,
const size_type row,
const size_type index )
inline

Constructor. Since we use accessors only for read access, a const matrix pointer is sufficient.

Definition at line 2196 of file trilinos_tpetra_sparse_matrix.h.

Member Function Documentation

◆ value()

template<typename Number, typename MemorySpace>
Accessor< Number, MemorySpace, false >::Reference LinearAlgebra::TpetraWrappers::SparseMatrixIterators::Accessor< Number, MemorySpace, false >::value ( ) const
inline

Value of this matrix entry.

Definition at line 2206 of file trilinos_tpetra_sparse_matrix.h.

◆ row()

AccessorBase< Number, MemorySpace >::size_type LinearAlgebra::TpetraWrappers::SparseMatrixIterators::AccessorBase< Number, MemorySpace >::row ( ) const
inline

Row number of the element represented by this object.

Definition at line 1317 of file trilinos_tpetra_sparse_matrix.h.

◆ index()

AccessorBase< Number, MemorySpace >::size_type LinearAlgebra::TpetraWrappers::SparseMatrixIterators::AccessorBase< Number, MemorySpace >::index ( ) const
inline

Index in row of the element represented by this object.

Definition at line 1323 of file trilinos_tpetra_sparse_matrix.h.

◆ column()

AccessorBase< Number, MemorySpace >::size_type LinearAlgebra::TpetraWrappers::SparseMatrixIterators::AccessorBase< Number, MemorySpace >::column ( ) const
inline

Column number of the element represented by this object.

Definition at line 1329 of file trilinos_tpetra_sparse_matrix.h.

◆ visit_present_row()

void LinearAlgebra::TpetraWrappers::SparseMatrixIterators::AccessorBase< Number, MemorySpace >::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 1355 of file trilinos_tpetra_sparse_matrix.h.

◆ Reference

template<typename Number, typename MemorySpace>
friend class Reference
friend

Definition at line 1535 of file trilinos_tpetra_sparse_matrix.h.

Member Data Documentation

◆ matrix

SparseMatrix<Number, MemorySpace>* LinearAlgebra::TpetraWrappers::SparseMatrixIterators::AccessorBase< Number, MemorySpace >::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 1338 of file trilinos_tpetra_sparse_matrix.h.

◆ a_row

Current row number.

Definition at line 1342 of file trilinos_tpetra_sparse_matrix.h.

◆ a_index

Current index in row.

Definition at line 1347 of file trilinos_tpetra_sparse_matrix.h.

◆ colnum_cache

std::shared_ptr<std::vector<::types::signed_global_dof_index> > LinearAlgebra::TpetraWrappers::SparseMatrixIterators::AccessorBase< Number, MemorySpace >::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 1370 of file trilinos_tpetra_sparse_matrix.h.

◆ value_cache

std::shared_ptr<std::vector<Number> > LinearAlgebra::TpetraWrappers::SparseMatrixIterators::AccessorBase< Number, MemorySpace >::value_cache
protected

Cache for the values of this row.

Definition at line 1375 of file trilinos_tpetra_sparse_matrix.h.


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