policies.hh

#ifndef DUNE_FEM_GRIDPART_COMMON_POLICIES_HH
#define DUNE_FEM_GRIDPART_COMMON_POLICIES_HH
 
#warning "This header should not be needed anymore. Remove it from the include list!"
 
 
#include <type_traits>
#include <utility>
 
#include <dune/grid/common/gridview.hh>
 
#include <dune/fem/gridpart/common/gridpart2gridview.hh>
 
namespace Dune
{
 
  namespace Fem
  {
 
    // Internal forward declaration
    // ----------------------------
 
    template< class Traits >
    class GridPartPolicies;
 
 
 
#ifndef DOXYGEN
 
    namespace __GridPartPolicies
    {
 
      // hasGridView
      // -----------
 
      template< class Traits >
      std::true_type __hasGridView ( const Traits &, const typename Traits::GridViewType * = nullptr );
 
      std::false_type __hasGridView ( ... );
 
      template< class Traits >
      struct hasGridView
      {
        static const bool v = decltype( __hasGridView( std::declval< Traits >() ) )::value;
      };
 
 
 
      // HasGridView
      // -----------
 
      template< class Traits, bool hasGridView = hasGridView< Traits >::v >
      class HasGridView;
 
      template< class Traits >
      class HasGridView< Traits, true >
      {
      public:
        typedef typename Traits::GridViewType GridViewType;
      };
 
      template< class Traits >
      class HasGridView< Traits, false >
      {
        typedef typename Traits::GridPartType GridPartType;
 
      public:
        typedef Dune::GridView< GridPart2GridViewTraits< GridPartType > > GridViewType;
 
      protected:
        HasGridView () = default;
 
      public:
        operator GridPart2GridViewImpl< GridPartType > () const
        {
          return GridPart2GridViewImpl< GridPartType >( impl() );
        }
 
      private:
        const GridPartType &impl () const
        {
          return static_cast< const GridPartType & >( *this );
        }
      };
 
    } // namespace __GridPartPolicies
 
#endif // #ifndef DOXYGEN
 
 
 
    // GridPartPolicies
    // ----------------
 
    template< class Traits >
    class GridPartPolicies
      : public __GridPartPolicies::HasGridView< Traits >
    {};
 
  } // namespace Fem
 
} // namespace Dune
 
#endif // #ifndef DUNE_FEM_GRIDPART_COMMON_POLICIES_HH