| // <utility> -*- C++ -*- |
| |
| // Copyright (C) 2001-2014 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 include/utility |
| * This is a Standard C++ Library header. |
| */ |
| |
| #ifndef _GLIBCXX_UTILITY |
| #define _GLIBCXX_UTILITY 1 |
| |
| #pragma GCC system_header |
| |
| /** |
| * @defgroup utilities Utilities |
| * |
| * Components deemed generally useful. Includes pair, tuple, |
| * forward/move helpers, ratio, function object, metaprogramming and |
| * type traits, time, date, and memory functions. |
| */ |
| |
| #include <bits/c++config.h> |
| #include <bits/stl_relops.h> |
| #include <bits/stl_pair.h> |
| |
| #if __cplusplus >= 201103L |
| #include <bits/move.h> |
| #include <initializer_list> |
| |
| namespace std _GLIBCXX_VISIBILITY(default) |
| { |
| _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| |
| template<class _Tp> |
| class tuple_size; |
| |
| template<std::size_t _Int, class _Tp> |
| class tuple_element; |
| |
| // Various functions which give std::pair a tuple-like interface. |
| template<class _Tp1, class _Tp2> |
| struct tuple_size<std::pair<_Tp1, _Tp2>> |
| : public integral_constant<std::size_t, 2> { }; |
| |
| template<class _Tp1, class _Tp2> |
| struct tuple_element<0, std::pair<_Tp1, _Tp2>> |
| { typedef _Tp1 type; }; |
| |
| template<class _Tp1, class _Tp2> |
| struct tuple_element<1, std::pair<_Tp1, _Tp2>> |
| { typedef _Tp2 type; }; |
| |
| template<std::size_t _Int> |
| struct __pair_get; |
| |
| template<> |
| struct __pair_get<0> |
| { |
| template<typename _Tp1, typename _Tp2> |
| static constexpr _Tp1& |
| __get(std::pair<_Tp1, _Tp2>& __pair) noexcept |
| { return __pair.first; } |
| |
| template<typename _Tp1, typename _Tp2> |
| static constexpr _Tp1&& |
| __move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept |
| { return std::forward<_Tp1>(__pair.first); } |
| |
| template<typename _Tp1, typename _Tp2> |
| static constexpr const _Tp1& |
| __const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept |
| { return __pair.first; } |
| }; |
| |
| template<> |
| struct __pair_get<1> |
| { |
| template<typename _Tp1, typename _Tp2> |
| static constexpr _Tp2& |
| __get(std::pair<_Tp1, _Tp2>& __pair) noexcept |
| { return __pair.second; } |
| |
| template<typename _Tp1, typename _Tp2> |
| static constexpr _Tp2&& |
| __move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept |
| { return std::forward<_Tp2>(__pair.second); } |
| |
| template<typename _Tp1, typename _Tp2> |
| static constexpr const _Tp2& |
| __const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept |
| { return __pair.second; } |
| }; |
| |
| template<std::size_t _Int, class _Tp1, class _Tp2> |
| constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type& |
| get(std::pair<_Tp1, _Tp2>& __in) noexcept |
| { return __pair_get<_Int>::__get(__in); } |
| |
| template<std::size_t _Int, class _Tp1, class _Tp2> |
| constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&& |
| get(std::pair<_Tp1, _Tp2>&& __in) noexcept |
| { return __pair_get<_Int>::__move_get(std::move(__in)); } |
| |
| template<std::size_t _Int, class _Tp1, class _Tp2> |
| constexpr const typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type& |
| get(const std::pair<_Tp1, _Tp2>& __in) noexcept |
| { return __pair_get<_Int>::__const_get(__in); } |
| |
| #if __cplusplus > 201103L |
| template <typename _Tp, typename _Up> |
| constexpr _Tp& |
| get(pair<_Tp, _Up>& __p) noexcept |
| { return __p.first; } |
| |
| template <typename _Tp, typename _Up> |
| constexpr const _Tp& |
| get(const pair<_Tp, _Up>& __p) noexcept |
| { return __p.first; } |
| |
| template <typename _Tp, typename _Up> |
| constexpr _Tp&& |
| get(pair<_Tp, _Up>&& __p) noexcept |
| { return std::move(__p.first); } |
| |
| template <typename _Tp, typename _Up> |
| constexpr _Tp& |
| get(pair<_Up, _Tp>& __p) noexcept |
| { return __p.second; } |
| |
| template <typename _Tp, typename _Up> |
| constexpr const _Tp& |
| get(const pair<_Up, _Tp>& __p) noexcept |
| { return __p.second; } |
| |
| template <typename _Tp, typename _Up> |
| constexpr _Tp&& |
| get(pair<_Up, _Tp>&& __p) noexcept |
| { return std::move(__p.second); } |
| |
| /// Assign @p __new_val to @p __obj and return its previous value. |
| template <typename _Tp, typename _Up = _Tp> |
| inline _Tp |
| exchange(_Tp& __obj, _Up&& __new_val) |
| { |
| _Tp __old_val = std::move(__obj); |
| __obj = std::forward<_Up>(__new_val); |
| return __old_val; |
| } |
| #endif |
| |
| // Stores a tuple of indices. Used by tuple and pair, and by bind() to |
| // extract the elements in a tuple. |
| template<size_t... _Indexes> |
| struct _Index_tuple |
| { |
| typedef _Index_tuple<_Indexes..., sizeof...(_Indexes)> __next; |
| }; |
| |
| // Builds an _Index_tuple<0, 1, 2, ..., _Num-1>. |
| template<size_t _Num> |
| struct _Build_index_tuple |
| { |
| typedef typename _Build_index_tuple<_Num - 1>::__type::__next __type; |
| }; |
| |
| template<> |
| struct _Build_index_tuple<0> |
| { |
| typedef _Index_tuple<> __type; |
| }; |
| |
| #if __cplusplus > 201103L |
| /// Class template integer_sequence |
| template<typename _Tp, _Tp... _Idx> |
| struct integer_sequence |
| { |
| typedef _Tp value_type; |
| static constexpr size_t size() { return sizeof...(_Idx); } |
| }; |
| |
| template<typename _Tp, _Tp _Num, |
| typename _ISeq = typename _Build_index_tuple<_Num>::__type> |
| struct _Make_integer_sequence; |
| |
| template<typename _Tp, _Tp _Num, size_t... _Idx> |
| struct _Make_integer_sequence<_Tp, _Num, _Index_tuple<_Idx...>> |
| { |
| static_assert( _Num >= 0, |
| "Cannot make integer sequence of negative length" ); |
| |
| typedef integer_sequence<_Tp, static_cast<_Tp>(_Idx)...> __type; |
| }; |
| |
| /// Alias template make_integer_sequence |
| template<typename _Tp, _Tp _Num> |
| using make_integer_sequence |
| = typename _Make_integer_sequence<_Tp, _Num>::__type; |
| |
| /// Alias template index_sequence |
| template<size_t... _Idx> |
| using index_sequence = integer_sequence<size_t, _Idx...>; |
| |
| /// Alias template make_index_sequence |
| template<size_t _Num> |
| using make_index_sequence = make_integer_sequence<size_t, _Num>; |
| |
| /// Alias template index_sequence_for |
| template<typename... _Types> |
| using index_sequence_for = make_index_sequence<sizeof...(_Types)>; |
| #endif |
| |
| _GLIBCXX_END_NAMESPACE_VERSION |
| } // namespace |
| |
| #endif |
| |
| #endif /* _GLIBCXX_UTILITY */ |