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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [libstdc++-v3/] [include/] [bits/] [stl_pair.h] - Rev 628
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// Pair implementation -*- C++ -*- // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 // 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/>. /* * * Copyright (c) 1994 * Hewlett-Packard Company * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Hewlett-Packard Company makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. * * * Copyright (c) 1996,1997 * Silicon Graphics Computer Systems, Inc. * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Silicon Graphics makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. */ /** @file stl_pair.h * This is an internal header file, included by other library headers. * You should not attempt to use it directly. */ #ifndef _STL_PAIR_H #define _STL_PAIR_H 1 #include <bits/move.h> // for std::move / std::forward, std::decay, and // std::swap #ifdef __GXX_EXPERIMENTAL_CXX0X__ #include <type_traits> #endif _GLIBCXX_BEGIN_NAMESPACE(std) /// pair holds two objects of arbitrary type. template<class _T1, class _T2> struct pair { typedef _T1 first_type; ///< @c first_type is the first bound type typedef _T2 second_type; ///< @c second_type is the second bound type _T1 first; ///< @c first is a copy of the first object _T2 second; ///< @c second is a copy of the second object // _GLIBCXX_RESOLVE_LIB_DEFECTS // 265. std::pair::pair() effects overly restrictive /** The default constructor creates @c first and @c second using their * respective default constructors. */ pair() : first(), second() { } /** Two objects may be passed to a @c pair constructor to be copied. */ pair(const _T1& __a, const _T2& __b) : first(__a), second(__b) { } #ifdef __GXX_EXPERIMENTAL_CXX0X__ // DR 811. template<class _U1, class = typename std::enable_if<std::is_convertible<_U1, _T1>::value>::type> pair(_U1&& __x, const _T2& __y) : first(std::forward<_U1>(__x)), second(__y) { } template<class _U2, class = typename std::enable_if<std::is_convertible<_U2, _T2>::value>::type> pair(const _T1& __x, _U2&& __y) : first(__x), second(std::forward<_U2>(__y)) { } template<class _U1, class _U2, class = typename std::enable_if<std::is_convertible<_U1, _T1>::value && std::is_convertible<_U2, _T2>::value>::type> pair(_U1&& __x, _U2&& __y) : first(std::forward<_U1>(__x)), second(std::forward<_U2>(__y)) { } #endif /** There is also a templated copy ctor for the @c pair class itself. */ template<class _U1, class _U2> pair(const pair<_U1, _U2>& __p) : first(__p.first), second(__p.second) { } #ifdef __GXX_EXPERIMENTAL_CXX0X__ template<class _U1, class _U2> pair(pair<_U1, _U2>&& __p) : first(std::forward<_U1>(__p.first)), second(std::forward<_U2>(__p.second)) { } pair& operator=(pair&& __p) { first = std::move(__p.first); second = std::move(__p.second); return *this; } template<class _U1, class _U2> pair& operator=(pair<_U1, _U2>&& __p) { first = std::move(__p.first); second = std::move(__p.second); return *this; } void swap(pair& __p) { using std::swap; swap(first, __p.first); swap(second, __p.second); } #endif }; /// Two pairs of the same type are equal iff their members are equal. template<class _T1, class _T2> inline bool operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) { return __x.first == __y.first && __x.second == __y.second; } /// <http://gcc.gnu.org/onlinedocs/libstdc++/manual/utilities.html> template<class _T1, class _T2> inline bool operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) { return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second); } /// Uses @c operator== to find the result. template<class _T1, class _T2> inline bool operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) { return !(__x == __y); } /// Uses @c operator< to find the result. template<class _T1, class _T2> inline bool operator>(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) { return __y < __x; } /// Uses @c operator< to find the result. template<class _T1, class _T2> inline bool operator<=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) { return !(__y < __x); } /// Uses @c operator< to find the result. template<class _T1, class _T2> inline bool operator>=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) { return !(__x < __y); } #ifdef __GXX_EXPERIMENTAL_CXX0X__ /// See std::pair::swap(). // Note: no std::swap overloads in C++03 mode, this has performance // implications, see, eg, libstdc++/38466. template<class _T1, class _T2> inline void swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y) { __x.swap(__y); } #endif /** * @brief A convenience wrapper for creating a pair from two objects. * @param x The first object. * @param y The second object. * @return A newly-constructed pair<> object of the appropriate type. * * The standard requires that the objects be passed by reference-to-const, * but LWG issue #181 says they should be passed by const value. We follow * the LWG by default. */ // _GLIBCXX_RESOLVE_LIB_DEFECTS // 181. make_pair() unintended behavior #ifndef __GXX_EXPERIMENTAL_CXX0X__ template<class _T1, class _T2> inline pair<_T1, _T2> make_pair(_T1 __x, _T2 __y) { return pair<_T1, _T2>(__x, __y); } #else template<typename _Tp> class reference_wrapper; // Helper which adds a reference to a type when given a reference_wrapper template<typename _Tp> struct __strip_reference_wrapper { typedef _Tp __type; }; template<typename _Tp> struct __strip_reference_wrapper<reference_wrapper<_Tp> > { typedef _Tp& __type; }; template<typename _Tp> struct __strip_reference_wrapper<const reference_wrapper<_Tp> > { typedef _Tp& __type; }; template<typename _Tp> struct __decay_and_strip { typedef typename __strip_reference_wrapper< typename decay<_Tp>::type>::__type __type; }; // NB: DR 706. template<class _T1, class _T2> inline pair<typename __decay_and_strip<_T1>::__type, typename __decay_and_strip<_T2>::__type> make_pair(_T1&& __x, _T2&& __y) { return pair<typename __decay_and_strip<_T1>::__type, typename __decay_and_strip<_T2>::__type> (std::forward<_T1>(__x), std::forward<_T2>(__y)); } #endif _GLIBCXX_END_NAMESPACE #endif /* _STL_PAIR_H */
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