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Diffstat (limited to 'contrib/libstdc++/include/bits/stl_pair.h')
| -rw-r--r-- | contrib/libstdc++/include/bits/stl_pair.h | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/contrib/libstdc++/include/bits/stl_pair.h b/contrib/libstdc++/include/bits/stl_pair.h new file mode 100644 index 0000000..d689ccc --- /dev/null +++ b/contrib/libstdc++/include/bits/stl_pair.h @@ -0,0 +1,157 @@ +// 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: |
