Pair.h

#ifndef UTIL_PAIR_H
#define UTIL_PAIR_H

/*
* Util Package - C++ Utilities for Scientific Computation
*
* Copyright 2010 - 2017, The Regents of the University of Minnesota
* Distributed under the terms of the GNU General Public License.
*/

#include <util/containers/FArray.h>
#include <iostream>

namespace Util
{

   template <typename Data>
   class Pair : public FArray <Data, 2>
   {

      #ifdef UTIL_MPI
      public:

      static void commitMpiType();
      #endif

   };

   template <typename Data>
   std::istream& operator>>(std::istream& in, Pair<Data> &pair)
   {
      in >> pair[0] >> pair[1];
      return in;
   }
   
   template <typename Data>
   std::ostream& operator<<(std::ostream& out, const Pair<Data> &pair) 
   {
      out << "    " << pair[0] << "    " << pair[1];
      return out;
   }

   #ifdef UTIL_MPI

   /*
   * Commit associated MPI Datatype.
   */
   template <typename Data>
   void Pair<Data>::commitMpiType() 
   {
      if (!MpiTraits< Pair<Data> >::hasType) {
         MpiStructBuilder builder;
         Pair<Data>       object;
         builder.setBase(&object);
         builder.addMember(&object[0], MpiTraits<Data>::type);
         builder.addMember(&object[1], MpiTraits<Data>::type);
         builder.commit(MpiTraits< Pair<Data> >::type);
         MpiTraits< Pair<Data> >::hasType = true;
      }
   }

   #endif 
} 
#endif