[Dune] [#743] Add a way to determine whether a grid is hybrid

[Dune]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Martin Nolte (nolte) 

Attached to Project - Dune
Summary - Add a way to determine whether a grid is hybrid
Task Type - Feature Request
Category - Grid
Status - New
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - SVN (pre2.0)
Due in Version - 2.1
Due Date - Undecided
Details - For meta-grids (like the GeometryGrid), it would be nice to know whether the underlying host grid is hybrid or not. In the non-hybrid case, the (constant) codim 0 geometry type would also be interesting (compile time constant).

Knowing the 2 things, GeometryGrid< AlbertaGrid, CoordFunction > could use the non-hybrid implementation of the generic geometries, saving some performace in explicit codes (2% in my last test, which is long ago).

One suggestion could be to add a GeometryInfo structure looking as follows:

struct GeometryInfo
{
  static const int dimension = dim;
  static const int dimensionworld = dimworld;
  static const bool hybrid = false;
  static const GeometryType::BasicType basicType = GeometryType::simplex;
};

Whether this structure can be obtained from somewhere within the grid or is a specialized structure outside the grid would, of course, need to be discussed. If this structure is not contained in the grid, we could provide a default implementation:

struct GeometryInfo
{
  static const int dimension = dim;
  static const int dimensionworld = dimworld;
  static const bool hybrid = true;
};

Apart from meta-grids, there might even be other code pieces, where this information is desirable (e.g., the MGMC mapper could does not need to look up the gemetry type for non-hybrid grids).

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=743

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