tuples.hh

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#ifndef DUNE_FEM_IO_STREAMS_TUPLES_HH
#define DUNE_FEM_IO_STREAMS_TUPLES_HH
 
#include <tuple>
#include <utility>
 
#include <dune/common/hybridutilities.hh>
#include <dune/fem/io/streams/streams.hh>
 
 
namespace Dune
{
 
  namespace Fem
  {
 
    // External forward declarations
    // -----------------------------
 
    template <class StreamTraits>
    class OutStreamInterface;
    template <class StreamTraits>
    class InStreamInterface;
 
 
 
    // std::tuple to InStream
    // ----------------------
 
    template< class StreamTraits >
    inline InStreamInterface< StreamTraits > &
      operator>> ( InStreamInterface< StreamTraits > &in, std::tuple<> &tuple )
    {
      return in;
    }
 
    template< class StreamTraits, class... Args >
    inline InStreamInterface< StreamTraits > &
      operator>> ( InStreamInterface< StreamTraits > &in, std::tuple< Args... > &tuple )
    {
 
      Hybrid::forEach ( std::make_index_sequence< sizeof...( Args ) >{}, [ & ]( auto i ){ in >> std::get< i >( tuple ); } );
      return in;
    }
 
 
 
    // std::tuple to OutStream
    // -----------------------
 
    template< class StreamTraits >
    inline OutStreamInterface< StreamTraits > &
      operator<< ( OutStreamInterface< StreamTraits > &out, const std::tuple<> &tuple )
    {
      return out;
    }
 
    template< class StreamTraits, class... Args >
    inline OutStreamInterface< StreamTraits > &
      operator<< ( OutStreamInterface< StreamTraits > &out, const std::tuple< Args... > &tuple )
    {
      Hybrid::forEach ( std::make_index_sequence< sizeof...( Args ) >{}, [ & ]( auto i ){ out << std::get< i >( tuple ); } );
      return out;
    }
 
  } // namespace Fem
 
} // namespace Dune
 
#endif // #ifndef DUNE_FEM_IO_STREAMS_TUPLES_HH