Public Member Functions | Static Public Member Functions | Private Member Functions | Private Attributes | Friends

TrilinosWrappers::SparsityPatternIterators::const_iterator::Accessor Class Reference

List of all members.

Public Member Functions

 Accessor (const SparsityPattern *sparsity_pattern, const unsigned int row, const unsigned int index)
unsigned int row () const
unsigned int index () const
unsigned int column () const

Static Public Member Functions

::ExceptionBaseExcBeyondEndOfSparsityPattern ()
::ExceptionBaseExcAccessToNonlocalRow (int arg1, int arg2, int arg3) throw (errortext << "You tried to access row " << arg1 << " of a distributed sparsity pattern, " << " but only rows " << arg2 << " through " << arg3 << " are stored locally and can be accessed." )

Private Member Functions

void visit_present_row ()

Private Attributes

SparsityPatternsparsity_pattern
unsigned int a_row
unsigned int a_index
std_cxx1x::shared_ptr< const
std::vector< unsigned int > > 
colnum_cache

Friends

class const_iterator

Detailed Description

Accessor class for iterators

Definition at line 67 of file trilinos_sparsity_pattern.h.


Constructor & Destructor Documentation

TrilinosWrappers::SparsityPatternIterators::const_iterator::Accessor::Accessor ( const SparsityPattern sparsity_pattern,
const unsigned int  row,
const unsigned int  index 
)

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


Member Function Documentation

unsigned int TrilinosWrappers::SparsityPatternIterators::const_iterator::Accessor::row (  ) const

Row number of the element represented by this object.

unsigned int TrilinosWrappers::SparsityPatternIterators::const_iterator::Accessor::index (  ) const

Index in row of the element represented by this object.

unsigned int TrilinosWrappers::SparsityPatternIterators::const_iterator::Accessor::column (  ) const

Column number of the element represented by this object.

::ExceptionBase& TrilinosWrappers::SparsityPatternIterators::const_iterator::Accessor::ExcBeyondEndOfSparsityPattern (  ) [static]

Exception

::ExceptionBase& TrilinosWrappers::SparsityPatternIterators::const_iterator::Accessor::ExcAccessToNonlocalRow ( int  arg1,
int  arg2,
int  arg3 
) throw (errortext << "You tried to access row " << arg1 << " of a distributed sparsity pattern, " << " but only rows " << arg2 << " through " << arg3 << " are stored locally and can be accessed." ) [static]

Exception

void TrilinosWrappers::SparsityPatternIterators::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.


Friends And Related Function Documentation

friend class const_iterator [friend]

Make enclosing class a friend.

Definition at line 170 of file trilinos_sparsity_pattern.h.


Member Data Documentation

The matrix accessed.

Definition at line 117 of file trilinos_sparsity_pattern.h.

Current row number.

Definition at line 122 of file trilinos_sparsity_pattern.h.

Current index in row.

Definition at line 127 of file trilinos_sparsity_pattern.h.

std_cxx1x::shared_ptr<const std::vector<unsigned int> > TrilinosWrappers::SparsityPatternIterators::const_iterator::Accessor::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 154 of file trilinos_sparsity_pattern.h.


The documentation for this class was generated from the following file:
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Defines

deal.II documentation generated on Fri Feb 3 2012 06:04:18 by doxygen 1.7.2