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- // Pair implementation -*- C++ -*-
-
- // Copyright (C) 2001 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 __GLIBCPP_INTERNAL_PAIR_H
- #define __GLIBCPP_INTERNAL_PAIR_H
-
- 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
- #ifdef _GLIBCPP_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() {}
- #else
- pair() : first(_T1()), second(_T2()) {}
- #endif
- /** 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.
- */
- template <class _T1, class _T2>
- #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
- //181. make_pair() unintended behavior
- inline pair<_T1, _T2> make_pair(_T1 __x, _T2 __y)
- #else
- inline pair<_T1, _T2> make_pair(const _T1& __x, const _T2& __y)
- #endif
- {
- return pair<_T1, _T2>(__x, __y);
- }
-
- } // namespace std
-
- #endif /* __GLIBCPP_INTERNAL_PAIR_H */
-
- // Local Variables:
- // mode:C++
- // End:
-