vectorcommdatahandle.hh

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#ifndef DUMUX_VECTOR_COMM_DATA_HANDLE_HH
#define DUMUX_VECTOR_COMM_DATA_HANDLE_HH
 
#include <algorithm>
 
#include <dune/common/version.hh>
#include <dune/grid/common/datahandleif.hh>
 
namespace Dumux {
 
namespace Detail {
 
    struct SetEqual
    {
        template<class A, class B>
        static void apply(A& a, const B& b)
        { a = b; }
    };
 
    struct Sum
    {
        template<class A, class B>
        static void apply(A& a, const B& b)
        { a += b; }
    };
 
    struct Max
    {
        template<class A, class B>
        static void apply(A& a, const B& b)
        {
            using std::max;
            a = max(a,b);
        }
    };
 
    struct Min
    {
        template<class A, class B>
        static void apply(A& a, const B& b)
        {
            using std::min;
            a = min(a,b);
        }
    };
} // end namespace Detail
 
template<class Mapper, class Vector, int entityCodim, class ScatterOperator>
class VectorCommDataHandle
  : public Dune::CommDataHandleIF<VectorCommDataHandle<Mapper,Vector, entityCodim, ScatterOperator>,
                                  typename Vector::value_type>
{
public:
  using DataType = typename Vector::value_type;
 
  VectorCommDataHandle(const Mapper& mapper, Vector& vector)
  : mapper_(mapper), vector_(vector)
  {}
 
  bool contains(int dim, int codim) const
  { return (codim == entityCodim); }
 
#if DUNE_VERSION_GTE(DUNE_GRID,2,7)
  bool fixedSize(int dim, int codim) const
  { return true; }
#else
  bool fixedsize(int dim, int codim) const
  { return true; }
#endif
 
  template<class Entity>
  std::size_t size(Entity& entity) const
  { return 1; }
 
  template<class MessageBuffer, class Entity>
  void gather(MessageBuffer& buff, const Entity& entity) const
  { buff.write(vector_[mapper_.index(entity)]); }
 
  template<class MessageBuffer, class Entity>
  void scatter(MessageBuffer& buff, const Entity& entity, std::size_t n)
  {
      DataType x;
      buff.read(x);
      ScatterOperator::apply(vector_[mapper_.index(entity)], x);
  }
 
protected:
  const Mapper& mapper_;
  Vector& vector_;
};
 
template<class Mapper, class Vector, int codim>
using VectorCommDataHandleEqual = VectorCommDataHandle<Mapper,Vector, codim, Detail::SetEqual>;
 
template<class Mapper, class Vector, int codim>
using VectorCommDataHandleSum = VectorCommDataHandle<Mapper,Vector, codim, Detail::Sum>;
 
template<class Mapper, class Vector, int codim>
using VectorCommDataHandleMin = VectorCommDataHandle<Mapper,Vector, codim, Detail::Min>;
 
template<class Mapper, class Vector, int codim>
using VectorCommDataHandleMax = VectorCommDataHandle<Mapper,Vector, codim, Detail::Max>;
 
} // end namespace Dumux
 
#endif // DUMUX_VECTOR_COMM_DATA_HANDLE_HH