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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc3/] [libstdc++-v3/] [include/] [bits/] [move.h] - Rev 516
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// Move, forward and identity for C++0x + swap -*- C++ -*- // Copyright (C) 2007, 2008, 2009 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 3, 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. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @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> // Brings in std::declval too. _GLIBCXX_BEGIN_NAMESPACE(std) /// identity template<typename _Tp> struct identity { typedef _Tp type; }; /// forward (as per N2835) /// Forward lvalues as rvalues. template<typename _Tp> inline typename enable_if<!is_lvalue_reference<_Tp>::value, _Tp&&>::type forward(typename std::identity<_Tp>::type& __t) { return static_cast<_Tp&&>(__t); } /// Forward rvalues as rvalues. template<typename _Tp> inline typename enable_if<!is_lvalue_reference<_Tp>::value, _Tp&&>::type forward(typename std::identity<_Tp>::type&& __t) { return static_cast<_Tp&&>(__t); } // Forward lvalues as lvalues. template<typename _Tp> inline typename enable_if<is_lvalue_reference<_Tp>::value, _Tp>::type forward(typename std::identity<_Tp>::type __t) { return __t; } // Prevent forwarding rvalues as const lvalues. template<typename _Tp> inline typename enable_if<is_lvalue_reference<_Tp>::value, _Tp>::type forward(typename std::remove_reference<_Tp>::type&& __t) = delete; /** * @brief Move a value. * @ingroup mutating_algorithms * @param __t A thing of arbitrary type. * @return Same, moved. */ template<typename _Tp> inline typename std::remove_reference<_Tp>::type&& move(_Tp&& __t) { return static_cast<typename std::remove_reference<_Tp>::type&&>(__t); } /// declval, defined in <type_traits>. _GLIBCXX_END_NAMESPACE #define _GLIBCXX_MOVE(_Tp) std::move(_Tp) #define _GLIBCXX_FORWARD(_Tp, __val) std::forward<_Tp>(__val) #else #define _GLIBCXX_MOVE(_Tp) (_Tp) #define _GLIBCXX_FORWARD(_Tp, __val) (__val) #endif _GLIBCXX_BEGIN_NAMESPACE(std) /** * @brief Swaps two values. * @ingroup mutating_algorithms * @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 */