| // Pair implementation -*- C++ -*- |
| |
| // Copyright (C) 2001, 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. |
| |
| // 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. |
| |
| /* |
| * |
| * 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 _PAIR_H |
| #define _PAIR_H 1 |
| |
| 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) { } |
| |
| /** 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) { } |
| }; |
| |
| /// 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++/20_util/howto.html#pairlt> |
| 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); } |
| |
| /** |
| * @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 |
| template<class _T1, class _T2> |
| inline pair<_T1, _T2> |
| make_pair(_T1 __x, _T2 __y) { return pair<_T1, _T2>(__x, __y); } |
| } // namespace std |
| |
| #endif /* _PAIR_H */ |
