polymorphicbufferwrapper.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_POLYMORPHICBUFFERWRAPPER_HH
#define DUNE_PDELAB_COMMON_POLYMORPHICBUFFERWRAPPER_HH
 
#include <cstddef>
#include <cassert>
 
namespace Dune {
  namespace PDELab {
 
 
    template<typename Buffer>
    class PolymorphicBufferWrapper
    {
 
    public:
 
      enum class Mode
      {
        send,
        receive,
      };
 
      template<typename T>
      void write(const T& data)
      {
        assert(_mode == Mode::send);
        const char* raw_data = reinterpret_cast<const char*>(&data);
        for (std::size_t i = 0; i < sizeof(T); ++i)
          _buffer.write(*(raw_data++));
      }
 
      template<typename T>
      void read(T& data)
      {
        assert(_mode == Mode::receive);
        char* raw_data = reinterpret_cast<char*>(&data);
        for (std::size_t i = 0; i < sizeof(T); ++i)
          _buffer.read(*(raw_data++));
      }
 
      PolymorphicBufferWrapper(Buffer& buffer, Mode mode, int rank = -1, bool transmit_rank = false)
        : _buffer(buffer)
        , _mode(mode)
        , _rank(rank)
        , _transmit_rank(transmit_rank)
        , _sender_rank(-1)
      {
        if (_transmit_rank)
          {
            assert(_rank >= 0);
            if (_mode == Mode::receive)
              read(_sender_rank);
            else
              write(_rank);
          }
      }
 
      Mode mode() const
      {
        return _mode;
      }
 
      bool transmitRank() const
      {
        return _transmit_rank;
      }
 
      int senderRank() const
      {
        assert(_sender_rank >= 0);
        return _sender_rank;
      }
 
    private:
 
      Buffer& _buffer;
      const Mode _mode;
      int _rank;
      const bool _transmit_rank;
      int _sender_rank;
 
    };
 
  } // namespace PDELab
} // namespace Dune
 
#endif // DUNE_PDELAB_COMMON_POLYMORPHICBUFFERWRAPPER_HH