topologyutility.hh

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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_PDELAB_COMMON_TOPOLOGYUTILITY_HH
#define DUNE_PDELAB_COMMON_TOPOLOGYUTILITY_HH
 
#include <dune/geometry/type.hh>
 
namespace Dune {
 
  namespace PDELab {
 
 
 
    template<int dimension, unsigned int topologyId>
    struct BasicTypeFromDimensionAndTopologyId
    {
      static const bool isCube =
        ((topologyId ^ ((1 << dimension)-1)) >> 1 == 0);
 
      static const bool isSimplex =
        (topologyId | 1) == 1;
 
      static const GeometryType::BasicType value =
        isSimplex ? GeometryType::simplex
        : (
          isCube ? GeometryType::cube
          : GeometryType::none
          );
    };
 
 
    inline Dune::GeometryType geometryTypeFromBasicType(Dune::GeometryType::BasicType basicType, int dim){
 
      unsigned int topologyId(0);
 
      if (dim > 1){
        switch( basicType )
        {
        case GeometryType::simplex :
          topologyId = 0;
          break;
        case GeometryType::cube :
          topologyId = ((1 << dim) - 1);
          break;
        case GeometryType::pyramid :
          if (dim == 3)
            topologyId = 0b0011;
          else
            DUNE_THROW( RangeError,
                        "Invalid basic geometry type: no pyramids for dimension " << dim << "." );
          break;
        case GeometryType::prism :
          if (dim == 3)
            topologyId = 0b0101;
          else
            DUNE_THROW( RangeError,
                        "Invalid basic geometry type: no prisms for dimension " << dim << "." );
          break;
        case GeometryType::none :
          break;
        default :
          DUNE_THROW( RangeError,
                      "Invalid basic geometry type: " << basicType << " for dimension " << dim << "." );
        }
      }
 
      return Dune::GeometryType(topologyId, dim);
    }
 
  } // namespace PDELab
} // namespace Dune
 
 
#endif // DUNE_PDELAB_COMMON_TOPOLOGYUTILITY_HH