typeindexset.hh

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#ifndef DUNE_GEOMETRY_TYPEINDEXSET_HH
#define DUNE_GEOMETRY_TYPEINDEXSET_HH
 
#include <cstddef>
 
#include <dune/geometry/type.hh>
 
namespace Dune
{
 
  namespace Fem
  {
    namespace hpDG {
    // LocalGeometryTypeIndexSet
    // -------------------------
 
    template< int dim, bool regular = false >
    class LocalGeometryTypeIndexSet;
 
    template< int dim >
    class LocalGeometryTypeIndexSet< dim, true >
    {
      typedef LocalGeometryTypeIndexSet< dim, true > This;
 
    public:
      inline static constexpr std::size_t size () noexcept
      {
        return (1 << dim) - ((1 << dim) >> 1);
      }
 
      inline static constexpr std::size_t index ( const GeometryType &type ) noexcept
      {
        return (type.id() >> 1);
      }
 
      inline static constexpr bool contains ( const GeometryType &type ) noexcept
      {
        return ((type.dim() == dim) && !type.isNone());
      }
 
      inline static GeometryType type ( std::size_t index ) noexcept
      {
        return GeometryType( static_cast< unsigned int >( index ) << 1, dim );
      }
    };
 
    template< int dim >
    class LocalGeometryTypeIndexSet< dim, false >
    {
      typedef LocalGeometryTypeIndexSet< dim, false > This;
      typedef LocalGeometryTypeIndexSet< dim, true > RegularTypeIndexSet;
 
    public:
      inline static constexpr std::size_t size () noexcept
      {
        return (RegularTypeIndexSet::size() + 1);
      }
 
      inline static constexpr std::size_t index ( const GeometryType &type ) noexcept
      {
        return (type.isNone() ? RegularTypeIndexSet::size() : type.id() >> 1);
      }
 
      inline static constexpr bool contains ( const GeometryType &type ) noexcept
      {
        return (type.dim() == dim);
      }
 
      inline static GeometryType type ( std::size_t index ) noexcept
      {
        return (index < RegularTypeIndexSet::size() ? RegularTypeIndexSet::type( index ) : GeometryType( 0, dim, true ));
      }
    };
 
 
 
    // GlobalGeometryTypeIndexSet
    // --------------------------
 
    template< int maxdim, bool regular = false >
    class GlobalGeometryTypeIndexSet;
 
    template< int maxdim >
    class GlobalGeometryTypeIndexSet< maxdim, true >
    {
      typedef GlobalGeometryTypeIndexSet< maxdim, true > This;
 
    public:
      inline static constexpr std::size_t size () noexcept
      {
        return (1 << maxdim);
      }
 
      inline static constexpr std::size_t index ( const GeometryType &type ) noexcept
      {
        return ((1 << type.dim()) + type.id()) >> 1;
      }
 
      inline static constexpr bool contains ( const GeometryType &type ) noexcept
      {
        return ((type.dim() <= maxdim) && !type.isNone());
      }
 
      inline static GeometryType type ( std::size_t index ) noexcept
      {
        return GeometryType( (index << 1) & ~(1 << dim( index )), dim( index ) );
      }
 
    private:
      inline static constexpr int dim ( std::size_t index, int d = maxdim )
      {
        return ((d <= 0) || ((index & (1 << (d-1))) != 0) ? d : dim( index, d-1 ));
      }
    };
 
    template< int maxdim >
    class GlobalGeometryTypeIndexSet< maxdim, false >
    {
      typedef GlobalGeometryTypeIndexSet< maxdim, false > This;
      typedef GlobalGeometryTypeIndexSet< maxdim, true > RegularTypeIndexSet;
 
    public:
      inline static constexpr std::size_t size () noexcept
      {
        return RegularTypeIndexSet::size() + (maxdim + 1);
      }
 
      inline static constexpr std::size_t index ( const GeometryType &type ) noexcept
      {
        return (type.isNone() ? RegularTypeIndexSet::size() + type.dim() : RegularTypeIndexSet::index( type ));
      }
 
      inline static constexpr bool contains ( const GeometryType &type ) noexcept
      {
        return (type.dim() <= maxdim);
      }
 
      inline static GeometryType type ( std::size_t index ) noexcept
      {
        return (index < RegularTypeIndexSet::size() ? RegularTypeIndexSet::type( index ) : GeometryType( 0, static_cast< int >( index - RegularTypeIndexSet::size() ), true ));
      }
    };
 
 
 
    // SingleGeometryTypeIndexSet
    // --------------------------
 
    template< unsigned int topologyId, int dim >
    class SingleGeometryTypeIndexSet
    {
      typedef SingleGeometryTypeIndexSet< topologyId, dim > This;
 
    public:
      inline static constexpr std::size_t size () noexcept
      {
        return 1;
      }
 
      inline static constexpr std::size_t index ( const GeometryType &type ) noexcept
      {
        return 0;
      }
 
      inline static constexpr bool contains ( const GeometryType &type ) noexcept
      {
        return (type == GeometryType( topologyId, dim ));
      }
 
      inline static GeometryType type ( std::size_t index ) noexcept
      {
        return GeometryType( topologyId, dim );
      }
    };
 
 
 
    // GeometryTypes
    // -------------
 
    template< class TypeIndexSet >
    struct GeometryTypes
    {
      struct Iterator
      {
        bool operator== ( const Iterator &other ) const { return (index == other.index); }
        bool operator!= ( const Iterator &other ) const { return (index != other.index); }
 
        GeometryType operator* () const { return TypeIndexSet::type( index ); }
 
        Iterator &operator++ () { ++index; return *this; }
 
        std::size_t index;
      };
 
      Iterator begin () const { return Iterator{ 0 }; }
      Iterator end () const { return Iterator{ TypeIndexSet::size() }; }
    };
 
} // namespace hpDG
} // namespace Fem
} // namespace Dune
 
#endif // #ifndef DUNE_GEOMETRY_TYPEINDEXSET_HH