Reference documentation for deal.II version 9.5.0
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Public Types | Public Member Functions | Static Public Member Functions | Private Member Functions | Private Attributes | Friends | List of all members
PETScWrappers::MatrixIterators::const_iterator::Accessor Class Reference

Public Types

using size_type = types::global_dof_index

Public Member Functions

 Accessor (const MatrixBase *matrix, const size_type row, const size_type index)
size_type row () const
size_type index () const
size_type column () const
PetscScalar value () const

Static Public Member Functions

static ::ExceptionBaseExcBeyondEndOfMatrix ()
static ::ExceptionBaseExcAccessToNonlocalRow (int arg1, int arg2, int arg3)

Private Member Functions

void visit_present_row ()

Private Attributes

size_type a_row
size_type a_index
std::shared_ptr< const std::vector< size_type > > colnum_cache
std::shared_ptr< const std::vector< PetscScalar > > value_cache


class const_iterator

Detailed Description

Accessor class for iterators

Definition at line 73 of file petsc_matrix_base.h.

Member Typedef Documentation

◆ size_type

Declare type for container size.

Definition at line 79 of file petsc_matrix_base.h.

Constructor & Destructor Documentation

◆ Accessor()

PETScWrappers::MatrixIterators::const_iterator::Accessor::Accessor ( const MatrixBase matrix,
const size_type  row,
const size_type  index 

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

Member Function Documentation

◆ row()

size_type PETScWrappers::MatrixIterators::const_iterator::Accessor::row ( ) const

Row number of the element represented by this object.

◆ index()

size_type PETScWrappers::MatrixIterators::const_iterator::Accessor::index ( ) const

Index in row of the element represented by this object.

◆ column()

size_type PETScWrappers::MatrixIterators::const_iterator::Accessor::column ( ) const

Column number of the element represented by this object.

◆ value()

PetscScalar PETScWrappers::MatrixIterators::const_iterator::Accessor::value ( ) const

Value of this matrix entry.

◆ visit_present_row()

void PETScWrappers::MatrixIterators::const_iterator::Accessor::visit_present_row ( )

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.

Friends And Related Symbol Documentation

◆ const_iterator

friend class const_iterator

Definition at line 173 of file petsc_matrix_base.h.

Member Data Documentation

◆ matrix

MatrixBase* PETScWrappers::MatrixIterators::const_iterator::Accessor::matrix

The matrix accessed.

Definition at line 133 of file petsc_matrix_base.h.

◆ a_row

size_type PETScWrappers::MatrixIterators::const_iterator::Accessor::a_row

Current row number.

Definition at line 138 of file petsc_matrix_base.h.

◆ a_index

size_type PETScWrappers::MatrixIterators::const_iterator::Accessor::a_index

Current index in row.

Definition at line 143 of file petsc_matrix_base.h.

◆ colnum_cache

std::shared_ptr<const std::vector<size_type> > PETScWrappers::MatrixIterators::const_iterator::Accessor::colnum_cache

Cache where we store the column indices of the present row. This is necessary, since PETSc 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 PETSc 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 157 of file petsc_matrix_base.h.

◆ value_cache

std::shared_ptr<const std::vector<PetscScalar> > PETScWrappers::MatrixIterators::const_iterator::Accessor::value_cache

Similar cache for the values of this row.

Definition at line 162 of file petsc_matrix_base.h.

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