// Pair implementation -*- C++ -*-
-// Copyright (C) 2001 Free Software Foundation, Inc.
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 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 2, or (at your option)
+// 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,
// 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.
+// 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.
-// 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.
+// 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/>.
/*
*
* 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()) {}
+#ifndef _STL_PAIR_H
+#define _STL_PAIR_H 1
+
+#include <bits/move.h> // for std::move / std::forward, std::decay, and
+ // std::swap
+
+_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__
+ template<class _U1, class _U2>
+ pair(_U1&& __x, _U2&& __y)
+ : first(std::forward<_U1>(__x)),
+ second(std::forward<_U2>(__y)) { }
+
+ pair(pair&& __p)
+ : first(std::move(__p.first)),
+ second(std::move(__p.second)) { }
#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)
+
+ /** 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::move(__p.first)),
+ second(std::move(__p.second)) { }
+
+ // http://gcc.gnu.org/ml/libstdc++/2007-08/msg00052.html
+ template<class _U1, class _Arg0, class... _Args>
+ pair(_U1&& __x, _Arg0&& __arg0, _Args&&... __args)
+ : first(std::forward<_U1>(__x)),
+ second(std::forward<_Arg0>(__arg0),
+ std::forward<_Args>(__args)...) { }
+
+ 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
-{
- return pair<_T1, _T2>(__x, __y);
-}
+ };
-} // namespace std
+ /// 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); }
+
+ template<class _T1, class _T2>
+ inline void
+ swap(pair<_T1, _T2>&& __x, pair<_T1, _T2>& __y)
+ { __x.swap(__y); }
+
+ 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
-#endif /* __GLIBCPP_INTERNAL_PAIR_H */
+_GLIBCXX_END_NAMESPACE
-// Local Variables:
-// mode:C++
-// End:
+#endif /* _STL_PAIR_H */
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