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Mesh entities of codimension 0 ("elements") allow to visit all intersections with "neighboring" elements and with the domain boundary. More...
#include <dune/grid/common/intersectioniterator.hh>
Public Types | |
typedef IntersectionIteratorImp< const GridImp > | ImplementationType |
typedef Dune::Intersection < const GridImp, IntersectionImp > | Intersection |
Type of Intersection this IntersectionIterator points to. | |
typedef remove_const< GridImp > ::type | mutableGridImp |
Public Member Functions | |
IntersectionIterator & | operator++ () |
Preincrement operator. Proceed to next intersection. | |
Dereferencing | |
const Intersection & | operator* () const |
Dereferencing operator. | |
const Intersection * | operator-> () const |
Pointer operator. | |
Compare methods | |
bool | operator== (const IntersectionIterator &rhs) const |
Checks for equality. Only Iterators pointing to the same intersection from the same Entity are equal. Pointing to the same intersection from neighbor is unequal as inside and outside are permuted. | |
bool | operator!= (const IntersectionIterator &rhs) const |
Checks for inequality. Only Iterators pointing to the same intersection from the same Entity are equal. Pointing to the same intersection from neighbor is unequal as inside and outside are permuted. | |
Implementor interface | |
bool | equals (const IntersectionIterator &rhs) const |
forward equality check to realIterator | |
IntersectionIterator (const IntersectionIteratorImp< const GridImp > &i) | |
IntersectionIterator (const IntersectionIterator &i) | |
Protected Member Functions | |
ImplementationType & | getRealImp () |
return reference to the real implementation | |
const ImplementationType & | getRealImp () const |
return reference to the real implementation | |
Friends | |
class | GridDefaultImplementation< GridImp::dimension, GridImp::dimensionworld, typename GridImp::ctype, typename GridImp::GridFamily > |
Mesh entities of codimension 0 ("elements") allow to visit all intersections with "neighboring" elements and with the domain boundary.
Template parameters are:
GridImp
Type that is a model of Dune::GridIntersectionIteratorImp
Class template that is a model of Dune::IntersectionIteratorIntersections are codimension 1 objects. These intersections are accessed via an IntersectionIterator. This allows the implementation of non-matching grids, as one face can now consist of several intersections. In a conforming mesh such an intersection corresponds to an entity of codimension 1 but in the general non-conforming case there will be no entity in the mesh that directly corresponds to the intersection. Thus, the IntersectionIterator describes these intersections implicitly.
The IntersectionIterator class template wraps an object of type IntersectionIteratorImp and forwards all member function calls to corresponding members of this class. In that sense IntersectionIterator defines the interface and IntersectionIteratorImp supplies the implementation.
On an entity e of codimension zero there are two ways to create IntersectionIterators by either using ilevelbegin() / ilevelend() or ileafbegin()/ileafend(). In the first case intersections with neighboring entities having the same level as e are traversed; in the second case ileafbegin()==ileafend() if e is not a leaf otherwise all intersections with neighboring leaf entities are traversed.
Consider a situation where two elements a and b have a common intersection. Element b has been refined into an element c and d, while a has not been refined. In one space dimension this situation is depicted in the figure below.
IntersectionIterator in a locally refined mesh.
Here the rule is the following: The LevelIntersectionIterator delivers all intersections with elements on the same level, the LeafIntersectionIterator delivers the intersections with all leaf elements if it has been started on a leaf element. Both iterators also stop at intersections with the grid boundary. According to this rule the level intersection iterator started at element a in the example above delivers an intersection with b and the left grid boundary, whereas the leaf intersection iterator returns c instead of b. Starting on entity c the level intersection iterator returns d and the intersection with the left boundary of the level 1 grid, but the leaf intersection iterator returns both d and a. Finally, starting on b the level intersection iterator returns a and the right boundary, but the leaf intersection iterator is empty since b is not a leaf entity of the grid. Starting on d both the level and the leaf intersection iterators will return the element c together with the right grid boundary.
typedef IntersectionIteratorImp<const GridImp> Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::ImplementationType |
typedef Dune::Intersection< const GridImp, IntersectionImp > Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::Intersection |
Type of Intersection this IntersectionIterator points to.
typedef remove_const<GridImp>::type Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::mutableGridImp |
Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::IntersectionIterator | ( | const IntersectionIteratorImp< const GridImp > & | i | ) | [inline] |
Copy Constructor from IntersectionIteratorImp
Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::IntersectionIterator | ( | const IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp > & | i | ) | [inline] |
Copy constructor
bool Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::equals | ( | const IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp > & | rhs | ) | const [inline] |
forward equality check to realIterator
Referenced by Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionIteratorImp >::operator!=(), Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::operator!=(), Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionIteratorImp >::operator==(), and Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::operator==().
const ImplementationType& Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::getRealImp | ( | ) | const [inline, protected] |
return reference to the real implementation
ImplementationType& Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::getRealImp | ( | ) | [inline, protected] |
return reference to the real implementation
Referenced by Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionIteratorImp >::equals(), and Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionIteratorImp >::operator++().
bool Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::operator!= | ( | const IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp > & | rhs | ) | const [inline] |
Checks for inequality. Only Iterators pointing to the same intersection from the same Entity are equal. Pointing to the same intersection from neighbor is unequal as inside and outside are permuted.
References Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::equals().
const Intersection& Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::operator* | ( | ) | const [inline] |
Dereferencing operator.
IntersectionIterator& Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::operator++ | ( | ) | [inline] |
Preincrement operator. Proceed to next intersection.
const Intersection* Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::operator-> | ( | ) | const [inline] |
Pointer operator.
bool Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::operator== | ( | const IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp > & | rhs | ) | const [inline] |
Checks for equality. Only Iterators pointing to the same intersection from the same Entity are equal. Pointing to the same intersection from neighbor is unequal as inside and outside are permuted.
References Dune::IntersectionIterator< GridImp, IntersectionIteratorImp, IntersectionImp >::equals().
friend class GridDefaultImplementation< GridImp::dimension, GridImp::dimensionworld,typename GridImp::ctype,typename GridImp::GridFamily > [friend] |
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