Reference documentation for deal.II version 9.5.0
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Public Member Functions | Static Public Member Functions | Private Types | Private Member Functions | Private Attributes | Static Private Attributes | List of all members
MGMatrixSelect< MatrixType, number > Class Template Referenceabstract
Multilevel support

#include <deal.II/multigrid/mg_matrix.h>

Inheritance diagram for MGMatrixSelect< MatrixType, number >:
[legend]

Public Member Functions

 MGMatrixSelect (const unsigned int row=0, const unsigned int col=0, MGLevelObject< MatrixType > *matrix=0)
 
void set_matrix (MGLevelObject< MatrixType > *M)
 
void select_block (const unsigned int row, const unsigned int col)
 
virtual void vmult (const unsigned int level, Vector< number > &dst, const Vector< number > &src) const
 
virtual void vmult_add (const unsigned int level, Vector< number > &dst, const Vector< number > &src) const
 
virtual void Tvmult (const unsigned int level, Vector< number > &dst, const Vector< number > &src) const
 
virtual void Tvmult_add (const unsigned int level, Vector< number > &dst, const Vector< number > &src) const
 
virtual unsigned int get_minlevel () const=0
 
virtual unsigned int get_maxlevel () const=0
 
template<class Archive >
void serialize (Archive &ar, const unsigned int version)
 
Subscriptor functionality

Classes derived from Subscriptor provide a facility to subscribe to this object. This is mostly used by the SmartPointer class.

void subscribe (std::atomic< bool > *const validity, const std::string &identifier="") const
 
void unsubscribe (std::atomic< bool > *const validity, const std::string &identifier="") const
 
unsigned int n_subscriptions () const
 
template<typename StreamType >
void list_subscribers (StreamType &stream) const
 
void list_subscribers () const
 

Static Public Member Functions

static ::ExceptionBase & ExcInUse (int arg1, std::string arg2, std::string arg3)
 
static ::ExceptionBase & ExcNoSubscriber (std::string arg1, std::string arg2)
 

Private Types

using map_value_type = decltype(counter_map)::value_type
 
using map_iterator = decltype(counter_map)::iterator
 

Private Member Functions

void check_no_subscribers () const noexcept
 

Private Attributes

SmartPointer< MGLevelObject< MatrixType >, MGMatrixSelect< MatrixType, number > > matrix
 
unsigned int row
 
unsigned int col
 
std::atomic< unsigned int > counter
 
std::map< std::string, unsigned int > counter_map
 
std::vector< std::atomic< bool > * > validity_pointers
 
const std::type_info * object_info
 

Static Private Attributes

static std::mutex mutex
 

Detailed Description

template<typename MatrixType, typename number>
class MGMatrixSelect< MatrixType, number >

Multilevel matrix selecting from block matrices. This class implements the interface defined by MGMatrixBase. The template parameter MatrixType should be a block matrix class like BlockSparseMatrix or BlockSparseMatrixEZ. Then, this class stores a pointer to a MGLevelObject of this matrix class. In each vmult, the block selected on initialization will be multiplied with the vector provided.

Definition at line 124 of file mg_matrix.h.

Member Typedef Documentation

◆ map_value_type

using Subscriptor::map_value_type = decltype(counter_map)::value_type
privateinherited

The data type used in counter_map.

Definition at line 230 of file subscriptor.h.

◆ map_iterator

using Subscriptor::map_iterator = decltype(counter_map)::iterator
privateinherited

The iterator type used in counter_map.

Definition at line 235 of file subscriptor.h.

Constructor & Destructor Documentation

◆ MGMatrixSelect()

template<typename MatrixType , typename number >
MGMatrixSelect< MatrixType, number >::MGMatrixSelect ( const unsigned int  row = 0,
const unsigned int  col = 0,
MGLevelObject< MatrixType > *  matrix = 0 
)

Constructor. row and col are the coordinate of the selected block. The other argument is handed over to the SmartPointer constructor.

Definition at line 323 of file mg_matrix.h.

Member Function Documentation

◆ set_matrix()

template<typename MatrixType , typename number >
void MGMatrixSelect< MatrixType, number >::set_matrix ( MGLevelObject< MatrixType > *  M)

Set the matrix object to be used. The matrix object must exist longer as the MGMatrixSelect object, since only a pointer is stored.

Definition at line 335 of file mg_matrix.h.

◆ select_block()

template<typename MatrixType , typename number >
void MGMatrixSelect< MatrixType, number >::select_block ( const unsigned int  row,
const unsigned int  col 
)

Select the block for multiplication.

Definition at line 344 of file mg_matrix.h.

◆ vmult()

template<typename MatrixType , typename number >
void MGMatrixSelect< MatrixType, number >::vmult ( const unsigned int  level,
Vector< number > &  dst,
const Vector< number > &  src 
) const
virtual

Matrix-vector-multiplication on a certain level.

Implements MGMatrixBase< Vector< number > >.

Definition at line 355 of file mg_matrix.h.

◆ vmult_add()

template<typename MatrixType , typename number >
void MGMatrixSelect< MatrixType, number >::vmult_add ( const unsigned int  level,
Vector< number > &  dst,
const Vector< number > &  src 
) const
virtual

Adding matrix-vector-multiplication on a certain level.

Implements MGMatrixBase< Vector< number > >.

Definition at line 369 of file mg_matrix.h.

◆ Tvmult()

template<typename MatrixType , typename number >
void MGMatrixSelect< MatrixType, number >::Tvmult ( const unsigned int  level,
Vector< number > &  dst,
const Vector< number > &  src 
) const
virtual

Transpose matrix-vector-multiplication on a certain level.

Implements MGMatrixBase< Vector< number > >.

Definition at line 383 of file mg_matrix.h.

◆ Tvmult_add()

template<typename MatrixType , typename number >
void MGMatrixSelect< MatrixType, number >::Tvmult_add ( const unsigned int  level,
Vector< number > &  dst,
const Vector< number > &  src 
) const
virtual

Adding transpose matrix-vector-multiplication on a certain level.

Implements MGMatrixBase< Vector< number > >.

Definition at line 397 of file mg_matrix.h.

◆ get_minlevel()

virtual unsigned int MGMatrixBase< Vector< number > >::get_minlevel ( ) const
pure virtualinherited

Return the minimal level for which matrices are stored.

◆ get_maxlevel()

virtual unsigned int MGMatrixBase< Vector< number > >::get_maxlevel ( ) const
pure virtualinherited

Return the minimal level for which matrices are stored.

◆ subscribe()

void Subscriptor::subscribe ( std::atomic< bool > *const  validity,
const std::string &  identifier = "" 
) const
inherited

Subscribes a user of the object by storing the pointer validity. The subscriber may be identified by text supplied as identifier.

Definition at line 136 of file subscriptor.cc.

◆ unsubscribe()

void Subscriptor::unsubscribe ( std::atomic< bool > *const  validity,
const std::string &  identifier = "" 
) const
inherited

Unsubscribes a user from the object.

Note
The identifier and the validity pointer must be the same as the one supplied to subscribe().

Definition at line 156 of file subscriptor.cc.

◆ n_subscriptions()

unsigned int Subscriptor::n_subscriptions ( ) const
inlineinherited

Return the present number of subscriptions to this object. This allows to use this class for reference counted lifetime determination where the last one to unsubscribe also deletes the object.

Definition at line 300 of file subscriptor.h.

◆ list_subscribers() [1/2]

template<typename StreamType >
void Subscriptor::list_subscribers ( StreamType &  stream) const
inlineinherited

List the subscribers to the input stream.

Definition at line 317 of file subscriptor.h.

◆ list_subscribers() [2/2]

void Subscriptor::list_subscribers ( ) const
inherited

List the subscribers to deallog.

Definition at line 204 of file subscriptor.cc.

◆ serialize()

template<class Archive >
void Subscriptor::serialize ( Archive &  ar,
const unsigned int  version 
)
inlineinherited

Read or write the data of this object to or from a stream for the purpose of serialization using the BOOST serialization library.

This function does not actually serialize any of the member variables of this class. The reason is that what this class stores is only who subscribes to this object, but who does so at the time of storing the contents of this object does not necessarily have anything to do with who subscribes to the object when it is restored. Consequently, we do not want to overwrite the subscribers at the time of restoring, and then there is no reason to write the subscribers out in the first place.

Definition at line 309 of file subscriptor.h.

◆ check_no_subscribers()

void Subscriptor::check_no_subscribers ( ) const
privatenoexceptinherited

Check that there are no objects subscribing to this object. If this check passes then it is safe to destroy the current object. It this check fails then this function will either abort or print an error message to deallog (by using the AssertNothrow mechanism), but will not throw an exception.

Note
Since this function is just a consistency check it does nothing in release mode.
If this function is called when there is an uncaught exception then, rather than aborting, this function prints an error message to the standard error stream and returns.

Definition at line 53 of file subscriptor.cc.

Member Data Documentation

◆ matrix

template<typename MatrixType , typename number >
SmartPointer<MGLevelObject<MatrixType>, MGMatrixSelect<MatrixType, number> > MGMatrixSelect< MatrixType, number >::matrix
private

Pointer to the matrix objects on each level.

Definition at line 185 of file mg_matrix.h.

◆ row

template<typename MatrixType , typename number >
unsigned int MGMatrixSelect< MatrixType, number >::row
private

Row coordinate of selected block.

Definition at line 189 of file mg_matrix.h.

◆ col

template<typename MatrixType , typename number >
unsigned int MGMatrixSelect< MatrixType, number >::col
private

Column coordinate of selected block.

Definition at line 193 of file mg_matrix.h.

◆ counter

std::atomic<unsigned int> Subscriptor::counter
mutableprivateinherited

Store the number of objects which subscribed to this object. Initially, this number is zero, and upon destruction it shall be zero again (i.e. all objects which subscribed should have unsubscribed again).

The creator (and owner) of an object is counted in the map below if HE manages to supply identification.

We use the mutable keyword in order to allow subscription to constant objects also.

This counter may be read from and written to concurrently in multithreaded code: hence we use the std::atomic class template.

Definition at line 219 of file subscriptor.h.

◆ counter_map

std::map<std::string, unsigned int> Subscriptor::counter_map
mutableprivateinherited

In this map, we count subscriptions for each different identification string supplied to subscribe().

Definition at line 225 of file subscriptor.h.

◆ validity_pointers

std::vector<std::atomic<bool> *> Subscriptor::validity_pointers
mutableprivateinherited

In this vector, we store pointers to the validity bool in the SmartPointer objects that subscribe to this class.

Definition at line 241 of file subscriptor.h.

◆ object_info

const std::type_info* Subscriptor::object_info
mutableprivateinherited

Pointer to the typeinfo object of this object, from which we can later deduce the class name. Since this information on the derived class is neither available in the destructor, nor in the constructor, we obtain it in between and store it here.

Definition at line 249 of file subscriptor.h.

◆ mutex

std::mutex Subscriptor::mutex
staticprivateinherited

A mutex used to ensure data consistency when printing out the list of subscribers.

Definition at line 271 of file subscriptor.h.

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