Reference documentation for deal.II version GIT 2f5445400b 2023-02-05 22:30:02+00:00
InterGridMap< MeshType > Class Template Reference

#include <deal.II/grid/intergrid_map.h>

Inheritance diagram for InterGridMap< MeshType >:
[legend]

## Public Types

using cell_iterator = typename MeshType::cell_iterator

## Public Member Functions

InterGridMap ()

void make_mapping (const MeshType &source_grid, const MeshType &destination_grid)

cell_iterator operator[] (const cell_iterator &source_cell) const

void clear ()

const MeshType & get_source_grid () const

const MeshType & get_destination_grid () const

std::size_t memory_consumption () const

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 ::ExceptionBaseExcInvalidKey (cell_iterator arg1)

static ::ExceptionBaseExcIncompatibleGrids ()

static ::ExceptionBaseExcInUse (int arg1, std::string arg2, std::string arg3)

static ::ExceptionBaseExcNoSubscriber (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 set_mapping (const cell_iterator &src_cell, const cell_iterator &dst_cell)

void set_entries_to_cell (const cell_iterator &src_cell, const cell_iterator &dst_cell)

void check_no_subscribers () const noexcept

## Private Attributes

std::vector< std::vector< cell_iterator > > mapping

SmartPointer< const MeshType, InterGridMap< MeshType > > source_grid

SmartPointer< const MeshType, InterGridMap< MeshType > > destination_grid

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<class MeshType> class InterGridMap< MeshType >

This class provides a map between two grids which are derived from the same coarse grid. For each cell iterator of the source map, it provides the respective cell iterator on the destination map, through its operator [].

Usually, the two grids will be refined differently. Then, the value returned for an iterator on the source grid will be either:

• The same cell on the destination grid, if it exists there;
• The most refined cell of the destination grid from which the pendant of the source cell could be obtained by refinement. This cell is always active and has a refinement level less than that of the source cell.

Keys for this map are all cells on the source grid, whether active or not.

For example, consider these two one-dimensional grids:

* Grid 1:
*   x--x--x-----x-----------x
*    1  2    3        4
*
* Grid 2:
*   x-----x-----x-----x-----x
*      1     2     3     4
* 

(Cell numbers are only given as an example and will not correspond to real cell iterator's indices.) The mapping from grid 1 to grid 2 will then be as follows:

*    Cell on grid 1         Cell on grid 2
*          1  ------------------>  1
*          2  ------------------>  1
*          3  ------------------>  2
*          4  ------------------>  mother cell of cells 3 and 4
*                                  (a non-active cell, not shown here)
* 

Besides the mappings shown here, the non-active cells on grid 1 are also valid keys. For example, the mapping for the mother cell of cells 1 and 2 on the first grid will point to cell 1 on the second grid.

Template Parameters
 MeshType This class may be used with any class that satisfies the MeshType concept. The extension to other classes offering iterator functions and some minor additional requirements is simple.

Note that this class could in principle be based on the C++ std::map<Key,Value> data type. Instead, it uses another data format which is more effective both in terms of computing time for access as well as with regard to memory consumption.

### Usage

In practice, use of this class is as follows:

// have two grids, which are derived from the same coarse grid
Triangulation<dim> tria1, tria2;
DoFHandler<dim> dof_handler_1 (tria1), dof_handler_2 (tria2);
...
// do something with these objects, e.g. refine the triangulations
// differently, distribute degrees of freedom, etc
...
// create the mapping
InterGridMap<DoFHandler<dim> > grid_1_to_2_map;
grid_1_to_2_map.make_mapping (dof_handler_1,
dof_handler_2);
...
typename DoFHandler<dim>::cell_iterator cell = dof_handler_1.begin(),
endc = dof_handler_1.end();
for (; cell!=endc; ++cell)
// now do something with the cell of dof_handler_2 corresponding to
// cell (which is one of dof_handler_1's cells)
f (grid_1_to_2_map[cell]);
void make_mapping(const MeshType &source_grid, const MeshType &destination_grid)
typename ActiveSelector::cell_iterator cell_iterator
Definition: dof_handler.h:465

Note that the template parameters to this class have to be given as InterGridMap<DoFHandler<2> >, which here is DoFHandler (and could equally well be Triangulation or PersistentTriangulation).

Definition at line 114 of file intergrid_map.h.

## ◆ cell_iterator

template<class MeshType >
 using InterGridMap< MeshType >::cell_iterator = typename MeshType::cell_iterator

Typedef to the iterator type of the grid class under consideration.

Definition at line 120 of file intergrid_map.h.

## ◆ 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.

## ◆ InterGridMap()

template<class MeshType >
 InterGridMap< MeshType >::InterGridMap

Constructor setting the class name arguments in the SmartPointer members.

Definition at line 37 of file intergrid_map.cc.

## ◆ make_mapping()

template<class MeshType >
 void InterGridMap< MeshType >::make_mapping ( const MeshType & source_grid, const MeshType & destination_grid )

Create the mapping between the two grids.

Definition at line 46 of file intergrid_map.cc.

## ◆ operator[]()

template<class MeshType >
 InterGridMap< MeshType >::cell_iterator InterGridMap< MeshType >::operator[] ( const cell_iterator & source_cell ) const

Access operator: give a cell on the source grid and receive the respective cell on the other grid, or if that does not exist, the most refined cell of which the source cell would be created if it were further refined.

Definition at line 157 of file intergrid_map.cc.

## ◆ clear()

template<class MeshType >
 void InterGridMap< MeshType >::clear

Delete all data of this class.

Definition at line 174 of file intergrid_map.cc.

## ◆ get_source_grid()

template<class MeshType >
 const MeshType & InterGridMap< MeshType >::get_source_grid

Return a reference to the source grid.

Definition at line 185 of file intergrid_map.cc.

## ◆ get_destination_grid()

template<class MeshType >
 const MeshType & InterGridMap< MeshType >::get_destination_grid

Return a reference to the destination grid.

Definition at line 194 of file intergrid_map.cc.

## ◆ memory_consumption()

template<class MeshType >
 std::size_t InterGridMap< MeshType >::memory_consumption

Determine an estimate for the memory consumption (in bytes) of this object.

Definition at line 203 of file intergrid_map.cc.

## ◆ set_mapping()

template<class MeshType >
 void InterGridMap< MeshType >::set_mapping ( const cell_iterator & src_cell, const cell_iterator & dst_cell )
private

Set the mapping for the pair of cells given. These shall match in level of refinement and all other properties.

Definition at line 102 of file intergrid_map.cc.

## ◆ set_entries_to_cell()

template<class MeshType >
 void InterGridMap< MeshType >::set_entries_to_cell ( const cell_iterator & src_cell, const cell_iterator & dst_cell )
private

Set the value of the key src_cell to dst_cell. Do so as well for all the children and their children of src_cell. This function is used for cells which are more refined on src_grid than on dst_grid; then all values of the hierarchy of cells and their children point to one cell on the dst_grid.

Definition at line 141 of file intergrid_map.cc.

## ◆ 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.

## ◆ mapping

template<class MeshType >
 std::vector > InterGridMap< MeshType >::mapping
private

The actual data. Hold one iterator for each cell on each level.

Definition at line 183 of file intergrid_map.h.

## ◆ source_grid

template<class MeshType >
 SmartPointer > InterGridMap< MeshType >::source_grid
private

Store a pointer to the source grid.

Definition at line 188 of file intergrid_map.h.

## ◆ destination_grid

template<class MeshType >
 SmartPointer > InterGridMap< MeshType >::destination_grid
private

Likewise for the destination grid.

Definition at line 193 of file intergrid_map.h.

## ◆ counter

 std::atomic 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 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 *> 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 files: