// TR1 functional header -*- C++ -*-

// Copyright (C) 2004 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.


#ifndef _TR1_FUNCTIONAL
#define _TR1_FUNCTIONAL 1

#include"../functional"

namespace std
{
namespace tr1
{

  template<typename _Tp>
  class reference_wrapper
  {
    _Tp* _M_data;
  public:
    typedef _Tp type;
    explicit reference_wrapper(_Tp& __indata): _M_data(&__indata)
    { }
    
    reference_wrapper(const reference_wrapper<_Tp>& __inref):
      _M_data(__inref._M_data)
    { }

    reference_wrapper& 
    operator=(const reference_wrapper<_Tp>& __inref)
    {
      _M_data = __inref._M_data;
      return *this;
    }

    operator _Tp& () const
    {
      return this->get();
    }
    
    _Tp&
    get() const
    {
      return *_M_data;
    }
  };
  
  // Denotes a reference should be taken to a variable.
  template<typename _Tp>
    reference_wrapper<_Tp>
    ref(_Tp& __t)
    { return reference_wrapper<_Tp>(__t); }
  
  // Denotes a const reference should be taken to a variable.
  template<typename _Tp>
    reference_wrapper<const _Tp>
    cref(const _Tp& __t)
    { return reference_wrapper<const _Tp>(__t); }

  template<typename _Tp>
    reference_wrapper<_Tp> ref(reference_wrapper<_Tp> __t)
    { return ref(__t.get()); }

  template<typename _Tp>
    reference_wrapper<const _Tp> cref(reference_wrapper<_Tp> __t)
    { return cref(__t.get()); }

}
}

#endif