[Dune] Problems concerning GridTraits

[Peter Bastian]

Robert Kloefkorn schrieb:
> Adrian Burri wrote:
> 
>>Hi,
>>
>>I support the proposed idea. Maybe it's a good idea to export the type
>>of the new external grid traits class under the name "Traits" in the
>>grid class as well. (That was probably the intention anyway, but it
>>isn't listed in the code snippet.)
>>Just a note regarding the naming: the access methods should be called
>>{leaf,level}IndexSet according to the Dune naming conventions.
> 
> 
> This is a very good idea. This feature is also supported by the IBM
> Compiler which might then compile the Dune code.
> 
This might be a little to optimistic :-)


OK, we have done it and that is what you have to do:

STEP 1
======

Create a class "FooGridFamily" in front of your grid. For yaspgrid this
looks like

template<int dim, int dimworld>
struct YaspGridFamily
{
  typedef GridTraits<dim,dimworld,Dune::YaspGrid<dim,dimworld>,
    YaspGeometry,YaspEntity,YaspBoundaryEntity,
    YaspEntityPointer,YaspLevelIterator,
    YaspIntersectionIterator,YaspHierarchicIterator,
    YaspLevelIterator,
    YaspLevelIndexSet<YaspGrid<dim,dimworld> >,
    YaspLevelIndexSet<YaspGrid<dim,dimworld> >,
    YaspGlobalIdSet<YaspGrid<dim,dimworld> >,
    yaspgrid_persistentindextype,
    YaspGlobalIdSet<YaspGrid<dim,dimworld> >,
    yaspgrid_persistentindextype> Traits;
};

This class collects all types related to a grid implementation.
Note the last 6 parameters are for the index and id sets.

STEP 2
======

In the public derivation of your grid from GridDefault use the
GridFamily instead of the grid (example for yaspgrid):

template<int dim, int dimworld>
class YaspGrid :
  public
GridDefault<dim,dimworld,yaspgrid_ctype,YaspGridFamily<dim,dimworld> >,
                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  public MultiYGrid<dim,yaspgrid_ctype>
{
...


STEP 3
======

In your grid implementation keep the Traits typedef for backward
compatibility which now reads

  typedef typename YaspGridFamily<dim,dimworld>::Traits Traits;


Thats all!

Please be patient the next minutes because we have to check in these things.

Peter & Christian


-- 
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Peter Bastian, IWR,Uni Heidelberg, INF 348,R 020, 69120 Heidelberg
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