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// Move, forward and identity for C++0x + swap -*- C++ -*-
// Copyright (C) 2007, 2008 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/** @file move.h
* This is an internal header file, included by other library headers.
* You should not attempt to use it directly.
*/
#ifndef _MOVE_H
#define _MOVE_H 1
#include <bits/c++config.h>
#include <cstddef>
#include <bits/concept_check.h>
#ifdef __GXX_EXPERIMENTAL_CXX0X__
#include <type_traits>
_GLIBCXX_BEGIN_NAMESPACE(std)
// 20.2.2, forward/move
template<typename _Tp>
struct identity
{
typedef _Tp type;
};
template<typename _Tp>
inline _Tp&&
forward(typename std::identity<_Tp>::type&& __t)
{ return __t; }
template<typename _Tp>
inline typename std::remove_reference<_Tp>::type&&
move(_Tp&& __t)
{ return __t; }
_GLIBCXX_END_NAMESPACE
#define _GLIBCXX_MOVE(_Tp) std::move(_Tp)
#else
#define _GLIBCXX_MOVE(_Tp) (_Tp)
#endif
_GLIBCXX_BEGIN_NAMESPACE(std)
/**
* @brief Swaps two values.
* @param a A thing of arbitrary type.
* @param b Another thing of arbitrary type.
* @return Nothing.
*/
template<typename _Tp>
inline void
swap(_Tp& __a, _Tp& __b)
{
// concept requirements
__glibcxx_function_requires(_SGIAssignableConcept<_Tp>)
_Tp __tmp = _GLIBCXX_MOVE(__a);
__a = _GLIBCXX_MOVE(__b);
__b = _GLIBCXX_MOVE(__tmp);
}
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR 809. std::swap should be overloaded for array types.
template<typename _Tp, size_t _Nm>
inline void
swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
{
for (size_t __n = 0; __n < _Nm; ++__n)
swap(__a[__n], __b[__n]);
}
_GLIBCXX_END_NAMESPACE
#endif /* _MOVE_H */
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