space/common/dataprojection/tuple.hh

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#ifndef DUNE_FEM_HPDG_SPACE_COMMON_DATAPROJECTION_TUPLE_HH
#define DUNE_FEM_HPDG_SPACE_COMMON_DATAPROJECTION_TUPLE_HH
 
#include <cstddef>
 
#include <tuple>
#include <utility>
#include <vector>
 
#include <dune/fem/common/forloop.hh>
 
#include "dataprojection.hh"
#include "default.hh"
 
namespace Dune
{
 
  namespace Fem
  {
 
    namespace hpDG
    {
 
      // DataProjectionTuple
      // -------------------
 
      template< class... DataProjections >
      class DataProjectionTuple;
 
      template< class Head, class... Tail >
      class DataProjectionTuple< Head, Tail... >
      : public DataProjection< typename Head::DiscreteFunctionSpaceType, DataProjectionTuple< Head, Tail... > >
      {
        using ThisType = DataProjectionTuple< Head, Tail... >;
        using BaseType = DataProjection< typename Head::DiscreteFunctionSpaceType, DataProjectionTuple< Head, Tail... > >;
 
      public:
        using DiscreteFunctionSpaceType = typename BaseType::DiscreteFunctionSpaceType;
        using BasisFunctionSetType = typename BaseType::BasisFunctionSetType;
        using EntityType = typename BaseType::EntityType;
 
      private:
        template< int i >
        struct Operation
        {
          static void apply ( const EntityType &entity,
                              const BasisFunctionSetType &prior,
                              const BasisFunctionSetType &present,
                              const std::vector< std::size_t > &origin,
                              const std::vector< std::size_t > &destination,
                              std::tuple< Head, Tail... > &tuple )
          {
            std::get< i >( tuple )( entity, prior, present, origin, destination );
          }
        };
 
        template< int i >
        struct Project
        {
          template <class TemporaryStorage>
          static void apply ( TemporaryStorage& tmp,
                              std::tuple< Head, Tail... > &tuple )
          {
            std::get< i >( tuple )( tmp );
          }
        };
 
        template< int i >
        struct AddToList
        {
          template< class Communicator >
          static void apply ( Communicator &comm,
                              std::tuple< Head, Tail... > &tuple )
          {
            std::get< i >( tuple ).addToList( comm );
          }
        };
 
      public:
        DataProjectionTuple ( Head &&head, Tail &&...tail )
          : tuple_( std::forward< Head >( head ), std::forward< Tail >( tail )... )
        {}
 
#ifndef DOXYGEN
 
        DataProjectionTuple ( const ThisType & ) = delete;
 
        DataProjectionTuple ( ThisType && ) = default;
 
        ThisType &operator= ( const ThisType & ) = delete;
 
        ThisType &operator= ( ThisType && ) = default;
 
#endif // #ifndef DOXYGEN
 
        void operator() ( const EntityType &entity,
                          const BasisFunctionSetType &prior,
                          const BasisFunctionSetType &present,
                          const std::vector< std::size_t > &origin,
                          const std::vector< std::size_t > &destination )
        {
          Dune::Fem::ForLoop< Operation, 0, sizeof...( Tail ) >::apply( entity, prior, present, origin, destination, tuple_ );
        }
 
        template <class TemporaryStorage>
        void operator () ( TemporaryStorage& tmp )
        {
          Dune::Fem::ForLoop< Project, 0, sizeof...( Tail ) >::apply( tmp, tuple_ );
        }
 
        template< class Communicator >
        void addToList ( Communicator &comm )
        {
          Dune::Fem::ForLoop< AddToList, 0, sizeof...( Tail ) >::apply( comm, tuple_ );
        }
 
      protected:
        std::tuple< Head, Tail... > tuple_;
      };
 
 
 
      // DefaultDataProjectionTuple
      // --------------------------
 
      template< class... DiscreteFunctions >
      class DefaultDataProjectionTuple
      : public DataProjectionTuple< DefaultDataProjection< DiscreteFunctions >... >
      {
        using BaseType = DataProjectionTuple< DefaultDataProjection< DiscreteFunctions >... >;
 
      public:
        explicit DefaultDataProjectionTuple ( DiscreteFunctions &... discreteFunctions )
          : BaseType( DefaultDataProjection< DiscreteFunctions >( discreteFunctions )... )
        {}
      };
 
    } // namespace hpDG
 
    // forward types to Fem namespace for convenience
    using hpDG::DefaultDataProjectionTuple ;
 
  } // namespace Fem
 
} // namespace Dune
 
#endif // #ifndef DUNE_FEM_HPDG_SPACE_COMMON_DATAPROJECTION_TUPLE_HH