move/example/movable.hpp

//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2009.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/move for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_MOVE_TEST_MOVABLE_HPP
#define BOOST_MOVE_TEST_MOVABLE_HPP

//[movable_definition 
//header file "movable.hpp"

//This devinition should only include a single, minimal move header
#include <boost/move/core.hpp>

//Forward declaration of 
namespace boost{

template<class T>
struct has_nothrow_move;

}  //namespace boost{

//A movable class
class movable
{
   BOOST_MOVABLE_BUT_NOT_COPYABLE(movable)
   int value_;

   public:
   movable() : value_(1){}

   //Move constructor and assignment
   movable(BOOST_RV_REF(movable) m)
   {  value_ = m.value_;   m.value_ = 0;  }

   movable & operator=(BOOST_RV_REF(movable) m)
   {  value_ = m.value_;   m.value_ = 0;  return *this;  }

   bool moved() const //Observer
   {  return !value_; }

   int value() const //Observer
   {  return value_; }
};

namespace boost{

template<>
struct has_nothrow_move<movable>
{
   static const bool value = true;
};

}  //namespace boost{
//]

#endif //BOOST_MOVE_TEST_MOVABLE_HPP