Public Member Functions | |
| Accessor (const MatrixBase *matrix, const unsigned int row, const unsigned int index) | |
| unsigned int | row () const |
| unsigned int | index () const |
| unsigned int | column () const |
| PetscScalar | value () const |
Static Public Member Functions | |
| ::ExceptionBase & | ExcBeyondEndOfMatrix () |
| ::ExceptionBase & | ExcAccessToNonlocalRow (int arg1, int arg2, int arg3) throw (errortext << "You tried to access row " << arg1 << " of a distributed matrix, but only rows " << arg2 << " through " << arg3 << " are stored locally and can be accessed." ) |
Private Member Functions | |
| void | visit_present_row () |
Private Attributes | |
| MatrixBase * | matrix |
| unsigned int | a_row |
| unsigned int | a_index |
| std_cxx1x::shared_ptr< const std::vector< unsigned int > > | colnum_cache |
| std_cxx1x::shared_ptr< const std::vector< PetscScalar > > | value_cache |
Friends | |
| class | const_iterator |
Accessor class for iterators
Definition at line 63 of file petsc_matrix_base.h.
| PETScWrappers::MatrixIterators::const_iterator::Accessor::Accessor | ( | const MatrixBase * | matrix, |
| const unsigned int | row, | ||
| const unsigned int | index | ||
| ) |
Constructor. Since we use accessors only for read access, a const matrix pointer is sufficient.
| unsigned int PETScWrappers::MatrixIterators::const_iterator::Accessor::row | ( | ) | const |
Row number of the element represented by this object.
| unsigned int PETScWrappers::MatrixIterators::const_iterator::Accessor::index | ( | ) | const |
Index in row of the element represented by this object.
| unsigned int PETScWrappers::MatrixIterators::const_iterator::Accessor::column | ( | ) | const |
Column number of the element represented by this object.
| PetscScalar PETScWrappers::MatrixIterators::const_iterator::Accessor::value | ( | ) | const |
Value of this matrix entry.
| ::ExceptionBase& PETScWrappers::MatrixIterators::const_iterator::Accessor::ExcBeyondEndOfMatrix | ( | ) | [static] |
Exception
| ::ExceptionBase& PETScWrappers::MatrixIterators::const_iterator::Accessor::ExcAccessToNonlocalRow | ( | int | arg1, |
| int | arg2, | ||
| int | arg3 | ||
| ) | throw (errortext << "You tried to access row " << arg1 << " of a distributed matrix, but only rows " << arg2 << " through " << arg3 << " are stored locally and can be accessed." ) [static] |
Exception
| void PETScWrappers::MatrixIterators::const_iterator::Accessor::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.
friend class const_iterator [friend] |
Make enclosing class a friend.
Definition at line 177 of file petsc_matrix_base.h.
MatrixBase* PETScWrappers::MatrixIterators::const_iterator::Accessor::matrix [mutable, private] |
The matrix accessed.
Definition at line 120 of file petsc_matrix_base.h.
Current row number.
Definition at line 125 of file petsc_matrix_base.h.
Current index in row.
Definition at line 130 of file petsc_matrix_base.h.
std_cxx1x::shared_ptr<const std::vector<unsigned int> > PETScWrappers::MatrixIterators::const_iterator::Accessor::colnum_cache [private] |
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 156 of file petsc_matrix_base.h.
std_cxx1x::shared_ptr<const std::vector<PetscScalar> > PETScWrappers::MatrixIterators::const_iterator::Accessor::value_cache [private] |
Similar cache for the values of this row.
Definition at line 162 of file petsc_matrix_base.h.
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