Tie.hpp

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//
// This file is part of MorphoGraphX - http://www.MorphoGraphX.org
// Copyright (C) 2012-2015 Richard S. Smith and collaborators.
//
// If you use MorphoGraphX in your work, please cite:
//   http://dx.doi.org/10.7554/eLife.05864
//
// MorphoGraphX is free software, and is licensed under under the terms of the 
// GNU General (GPL) Public License version 2.0, http://www.gnu.org/licenses.
// 
#ifndef TIE_HPP
#define TIE_HPP
 
#include <Config.hpp>
 
#include <utility>
 
namespace mgx 
{
  // Code taken from the Boost library !
  template <typename T, typename U> struct refpair {
    typedef T first_type;
    typedef U second_type;
  
    refpair(T& x, U& y) : first(x) , second(y) {}
    refpair(refpair const& rp) : first(rp.first), second(rp.second) {}
  
    refpair& operator=(std::pair<T, U> const& p)
    {
      first = p.first;
      second = p.second;
      return *this;
    }
  
    T& first;
    U& second;
  };
  
  template <typename T, typename U> inline refpair<T, U> tie(T& x, U& y) 
                {
    return refpair<T, U>(x, y);
  }
}
#endif