| // <tuple> -*- C++ -*- |
| |
| // Copyright (C) 2007-2015 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/>. |
| |
| /** @file include/tuple |
| * This is a Standard C++ Library header. |
| */ |
| |
| #ifndef _GLIBCXX_TUPLE |
| #define _GLIBCXX_TUPLE 1 |
| |
| #pragma GCC system_header |
| |
| #if __cplusplus < 201103L |
| # include <bits/c++0x_warning.h> |
| #else |
| |
| #include <utility> |
| #include <array> |
| #include <bits/uses_allocator.h> |
| |
| namespace std _GLIBCXX_VISIBILITY(default) |
| { |
| _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| |
| /** |
| * @addtogroup utilities |
| * @{ |
| */ |
| |
| template<std::size_t _Idx, typename _Head, bool _IsEmptyNotFinal> |
| struct _Head_base; |
| |
| template<std::size_t _Idx, typename _Head> |
| struct _Head_base<_Idx, _Head, true> |
| : public _Head |
| { |
| constexpr _Head_base() |
| : _Head() { } |
| |
| constexpr _Head_base(const _Head& __h) |
| : _Head(__h) { } |
| |
| constexpr _Head_base(const _Head_base&) = default; |
| constexpr _Head_base(_Head_base&&) = default; |
| |
| template<typename _UHead> |
| constexpr _Head_base(_UHead&& __h) |
| : _Head(std::forward<_UHead>(__h)) { } |
| |
| _Head_base(allocator_arg_t, __uses_alloc0) |
| : _Head() { } |
| |
| template<typename _Alloc> |
| _Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a) |
| : _Head(allocator_arg, *__a._M_a) { } |
| |
| template<typename _Alloc> |
| _Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a) |
| : _Head(*__a._M_a) { } |
| |
| template<typename _UHead> |
| _Head_base(__uses_alloc0, _UHead&& __uhead) |
| : _Head(std::forward<_UHead>(__uhead)) { } |
| |
| template<typename _Alloc, typename _UHead> |
| _Head_base(__uses_alloc1<_Alloc> __a, _UHead&& __uhead) |
| : _Head(allocator_arg, *__a._M_a, std::forward<_UHead>(__uhead)) { } |
| |
| template<typename _Alloc, typename _UHead> |
| _Head_base(__uses_alloc2<_Alloc> __a, _UHead&& __uhead) |
| : _Head(std::forward<_UHead>(__uhead), *__a._M_a) { } |
| |
| static constexpr _Head& |
| _M_head(_Head_base& __b) noexcept { return __b; } |
| |
| static constexpr const _Head& |
| _M_head(const _Head_base& __b) noexcept { return __b; } |
| }; |
| |
| template<std::size_t _Idx, typename _Head> |
| struct _Head_base<_Idx, _Head, false> |
| { |
| constexpr _Head_base() |
| : _M_head_impl() { } |
| |
| constexpr _Head_base(const _Head& __h) |
| : _M_head_impl(__h) { } |
| |
| constexpr _Head_base(const _Head_base&) = default; |
| constexpr _Head_base(_Head_base&&) = default; |
| |
| template<typename _UHead> |
| constexpr _Head_base(_UHead&& __h) |
| : _M_head_impl(std::forward<_UHead>(__h)) { } |
| |
| _Head_base(allocator_arg_t, __uses_alloc0) |
| : _M_head_impl() { } |
| |
| template<typename _Alloc> |
| _Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a) |
| : _M_head_impl(allocator_arg, *__a._M_a) { } |
| |
| template<typename _Alloc> |
| _Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a) |
| : _M_head_impl(*__a._M_a) { } |
| |
| template<typename _UHead> |
| _Head_base(__uses_alloc0, _UHead&& __uhead) |
| : _M_head_impl(std::forward<_UHead>(__uhead)) { } |
| |
| template<typename _Alloc, typename _UHead> |
| _Head_base(__uses_alloc1<_Alloc> __a, _UHead&& __uhead) |
| : _M_head_impl(allocator_arg, *__a._M_a, std::forward<_UHead>(__uhead)) |
| { } |
| |
| template<typename _Alloc, typename _UHead> |
| _Head_base(__uses_alloc2<_Alloc> __a, _UHead&& __uhead) |
| : _M_head_impl(std::forward<_UHead>(__uhead), *__a._M_a) { } |
| |
| static constexpr _Head& |
| _M_head(_Head_base& __b) noexcept { return __b._M_head_impl; } |
| |
| static constexpr const _Head& |
| _M_head(const _Head_base& __b) noexcept { return __b._M_head_impl; } |
| |
| _Head _M_head_impl; |
| }; |
| |
| /** |
| * Contains the actual implementation of the @c tuple template, stored |
| * as a recursive inheritance hierarchy from the first element (most |
| * derived class) to the last (least derived class). The @c Idx |
| * parameter gives the 0-based index of the element stored at this |
| * point in the hierarchy; we use it to implement a constant-time |
| * get() operation. |
| */ |
| template<std::size_t _Idx, typename... _Elements> |
| struct _Tuple_impl; |
| |
| template<typename _Tp> |
| struct __is_empty_non_tuple : is_empty<_Tp> { }; |
| |
| // Using EBO for elements that are tuples causes ambiguous base errors. |
| template<typename _El0, typename... _El> |
| struct __is_empty_non_tuple<tuple<_El0, _El...>> : false_type { }; |
| |
| // Use the Empty Base-class Optimization for empty, non-final types. |
| template<typename _Tp> |
| using __empty_not_final |
| = typename conditional<__is_final(_Tp), false_type, |
| __is_empty_non_tuple<_Tp>>::type; |
| |
| /** |
| * Recursive tuple implementation. Here we store the @c Head element |
| * and derive from a @c Tuple_impl containing the remaining elements |
| * (which contains the @c Tail). |
| */ |
| template<std::size_t _Idx, typename _Head, typename... _Tail> |
| struct _Tuple_impl<_Idx, _Head, _Tail...> |
| : public _Tuple_impl<_Idx + 1, _Tail...>, |
| private _Head_base<_Idx, _Head, __empty_not_final<_Head>::value> |
| { |
| template<std::size_t, typename...> friend class _Tuple_impl; |
| |
| typedef _Tuple_impl<_Idx + 1, _Tail...> _Inherited; |
| typedef _Head_base<_Idx, _Head, __empty_not_final<_Head>::value> _Base; |
| |
| static constexpr _Head& |
| _M_head(_Tuple_impl& __t) noexcept { return _Base::_M_head(__t); } |
| |
| static constexpr const _Head& |
| _M_head(const _Tuple_impl& __t) noexcept { return _Base::_M_head(__t); } |
| |
| static constexpr _Inherited& |
| _M_tail(_Tuple_impl& __t) noexcept { return __t; } |
| |
| static constexpr const _Inherited& |
| _M_tail(const _Tuple_impl& __t) noexcept { return __t; } |
| |
| constexpr _Tuple_impl() |
| : _Inherited(), _Base() { } |
| |
| explicit |
| constexpr _Tuple_impl(const _Head& __head, const _Tail&... __tail) |
| : _Inherited(__tail...), _Base(__head) { } |
| |
| template<typename _UHead, typename... _UTail, typename = typename |
| enable_if<sizeof...(_Tail) == sizeof...(_UTail)>::type> |
| explicit |
| constexpr _Tuple_impl(_UHead&& __head, _UTail&&... __tail) |
| : _Inherited(std::forward<_UTail>(__tail)...), |
| _Base(std::forward<_UHead>(__head)) { } |
| |
| constexpr _Tuple_impl(const _Tuple_impl&) = default; |
| |
| constexpr |
| _Tuple_impl(_Tuple_impl&& __in) |
| noexcept(__and_<is_nothrow_move_constructible<_Head>, |
| is_nothrow_move_constructible<_Inherited>>::value) |
| : _Inherited(std::move(_M_tail(__in))), |
| _Base(std::forward<_Head>(_M_head(__in))) { } |
| |
| template<typename... _UElements> |
| constexpr _Tuple_impl(const _Tuple_impl<_Idx, _UElements...>& __in) |
| : _Inherited(_Tuple_impl<_Idx, _UElements...>::_M_tail(__in)), |
| _Base(_Tuple_impl<_Idx, _UElements...>::_M_head(__in)) { } |
| |
| template<typename _UHead, typename... _UTails> |
| constexpr _Tuple_impl(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in) |
| : _Inherited(std::move |
| (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))), |
| _Base(std::forward<_UHead> |
| (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))) { } |
| |
| template<typename _Alloc> |
| _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a) |
| : _Inherited(__tag, __a), |
| _Base(__tag, __use_alloc<_Head>(__a)) { } |
| |
| template<typename _Alloc> |
| _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| const _Head& __head, const _Tail&... __tail) |
| : _Inherited(__tag, __a, __tail...), |
| _Base(__use_alloc<_Head, _Alloc, _Head>(__a), __head) { } |
| |
| template<typename _Alloc, typename _UHead, typename... _UTail, |
| typename = typename enable_if<sizeof...(_Tail) |
| == sizeof...(_UTail)>::type> |
| _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| _UHead&& __head, _UTail&&... __tail) |
| : _Inherited(__tag, __a, std::forward<_UTail>(__tail)...), |
| _Base(__use_alloc<_Head, _Alloc, _UHead>(__a), |
| std::forward<_UHead>(__head)) { } |
| |
| template<typename _Alloc> |
| _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| const _Tuple_impl& __in) |
| : _Inherited(__tag, __a, _M_tail(__in)), |
| _Base(__use_alloc<_Head, _Alloc, _Head>(__a), _M_head(__in)) { } |
| |
| template<typename _Alloc> |
| _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| _Tuple_impl&& __in) |
| : _Inherited(__tag, __a, std::move(_M_tail(__in))), |
| _Base(__use_alloc<_Head, _Alloc, _Head>(__a), |
| std::forward<_Head>(_M_head(__in))) { } |
| |
| template<typename _Alloc, typename... _UElements> |
| _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| const _Tuple_impl<_Idx, _UElements...>& __in) |
| : _Inherited(__tag, __a, |
| _Tuple_impl<_Idx, _UElements...>::_M_tail(__in)), |
| _Base(__use_alloc<_Head, _Alloc, _Head>(__a), |
| _Tuple_impl<_Idx, _UElements...>::_M_head(__in)) { } |
| |
| template<typename _Alloc, typename _UHead, typename... _UTails> |
| _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| _Tuple_impl<_Idx, _UHead, _UTails...>&& __in) |
| : _Inherited(__tag, __a, std::move |
| (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))), |
| _Base(__use_alloc<_Head, _Alloc, _UHead>(__a), |
| std::forward<_UHead> |
| (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))) { } |
| |
| _Tuple_impl& |
| operator=(const _Tuple_impl& __in) |
| { |
| _M_head(*this) = _M_head(__in); |
| _M_tail(*this) = _M_tail(__in); |
| return *this; |
| } |
| |
| _Tuple_impl& |
| operator=(_Tuple_impl&& __in) |
| noexcept(__and_<is_nothrow_move_assignable<_Head>, |
| is_nothrow_move_assignable<_Inherited>>::value) |
| { |
| _M_head(*this) = std::forward<_Head>(_M_head(__in)); |
| _M_tail(*this) = std::move(_M_tail(__in)); |
| return *this; |
| } |
| |
| template<typename... _UElements> |
| _Tuple_impl& |
| operator=(const _Tuple_impl<_Idx, _UElements...>& __in) |
| { |
| _M_head(*this) = _Tuple_impl<_Idx, _UElements...>::_M_head(__in); |
| _M_tail(*this) = _Tuple_impl<_Idx, _UElements...>::_M_tail(__in); |
| return *this; |
| } |
| |
| template<typename _UHead, typename... _UTails> |
| _Tuple_impl& |
| operator=(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in) |
| { |
| _M_head(*this) = std::forward<_UHead> |
| (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in)); |
| _M_tail(*this) = std::move |
| (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in)); |
| return *this; |
| } |
| |
| protected: |
| void |
| _M_swap(_Tuple_impl& __in) |
| noexcept(noexcept(swap(std::declval<_Head&>(), |
| std::declval<_Head&>())) |
| && noexcept(_M_tail(__in)._M_swap(_M_tail(__in)))) |
| { |
| using std::swap; |
| swap(_M_head(*this), _M_head(__in)); |
| _Inherited::_M_swap(_M_tail(__in)); |
| } |
| }; |
| |
| // Basis case of inheritance recursion. |
| template<std::size_t _Idx, typename _Head> |
| struct _Tuple_impl<_Idx, _Head> |
| : private _Head_base<_Idx, _Head, __empty_not_final<_Head>::value> |
| { |
| template<std::size_t, typename...> friend class _Tuple_impl; |
| |
| typedef _Head_base<_Idx, _Head, __empty_not_final<_Head>::value> _Base; |
| |
| static constexpr _Head& |
| _M_head(_Tuple_impl& __t) noexcept { return _Base::_M_head(__t); } |
| |
| static constexpr const _Head& |
| _M_head(const _Tuple_impl& __t) noexcept { return _Base::_M_head(__t); } |
| |
| constexpr _Tuple_impl() |
| : _Base() { } |
| |
| explicit |
| constexpr _Tuple_impl(const _Head& __head) |
| : _Base(__head) { } |
| |
| template<typename _UHead> |
| explicit |
| constexpr _Tuple_impl(_UHead&& __head) |
| : _Base(std::forward<_UHead>(__head)) { } |
| |
| constexpr _Tuple_impl(const _Tuple_impl&) = default; |
| |
| constexpr |
| _Tuple_impl(_Tuple_impl&& __in) |
| noexcept(is_nothrow_move_constructible<_Head>::value) |
| : _Base(std::forward<_Head>(_M_head(__in))) { } |
| |
| template<typename _UHead> |
| constexpr _Tuple_impl(const _Tuple_impl<_Idx, _UHead>& __in) |
| : _Base(_Tuple_impl<_Idx, _UHead>::_M_head(__in)) { } |
| |
| template<typename _UHead> |
| constexpr _Tuple_impl(_Tuple_impl<_Idx, _UHead>&& __in) |
| : _Base(std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in))) |
| { } |
| |
| template<typename _Alloc> |
| _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a) |
| : _Base(__tag, __use_alloc<_Head>(__a)) { } |
| |
| template<typename _Alloc> |
| _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| const _Head& __head) |
| : _Base(__use_alloc<_Head, _Alloc, _Head>(__a), __head) { } |
| |
| template<typename _Alloc, typename _UHead> |
| _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| _UHead&& __head) |
| : _Base(__use_alloc<_Head, _Alloc, _UHead>(__a), |
| std::forward<_UHead>(__head)) { } |
| |
| template<typename _Alloc> |
| _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| const _Tuple_impl& __in) |
| : _Base(__use_alloc<_Head, _Alloc, _Head>(__a), _M_head(__in)) { } |
| |
| template<typename _Alloc> |
| _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| _Tuple_impl&& __in) |
| : _Base(__use_alloc<_Head, _Alloc, _Head>(__a), |
| std::forward<_Head>(_M_head(__in))) { } |
| |
| template<typename _Alloc, typename _UHead> |
| _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| const _Tuple_impl<_Idx, _UHead>& __in) |
| : _Base(__use_alloc<_Head, _Alloc, _Head>(__a), |
| _Tuple_impl<_Idx, _UHead>::_M_head(__in)) { } |
| |
| template<typename _Alloc, typename _UHead> |
| _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a, |
| _Tuple_impl<_Idx, _UHead>&& __in) |
| : _Base(__use_alloc<_Head, _Alloc, _UHead>(__a), |
| std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in))) |
| { } |
| |
| _Tuple_impl& |
| operator=(const _Tuple_impl& __in) |
| { |
| _M_head(*this) = _M_head(__in); |
| return *this; |
| } |
| |
| _Tuple_impl& |
| operator=(_Tuple_impl&& __in) |
| noexcept(is_nothrow_move_assignable<_Head>::value) |
| { |
| _M_head(*this) = std::forward<_Head>(_M_head(__in)); |
| return *this; |
| } |
| |
| template<typename _UHead> |
| _Tuple_impl& |
| operator=(const _Tuple_impl<_Idx, _UHead>& __in) |
| { |
| _M_head(*this) = _Tuple_impl<_Idx, _UHead>::_M_head(__in); |
| return *this; |
| } |
| |
| template<typename _UHead> |
| _Tuple_impl& |
| operator=(_Tuple_impl<_Idx, _UHead>&& __in) |
| { |
| _M_head(*this) |
| = std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in)); |
| return *this; |
| } |
| |
| protected: |
| void |
| _M_swap(_Tuple_impl& __in) |
| noexcept(noexcept(swap(std::declval<_Head&>(), std::declval<_Head&>()))) |
| { |
| using std::swap; |
| swap(_M_head(*this), _M_head(__in)); |
| } |
| }; |
| |
| /// Primary class template, tuple |
| template<typename... _Elements> |
| class tuple : public _Tuple_impl<0, _Elements...> |
| { |
| typedef _Tuple_impl<0, _Elements...> _Inherited; |
| |
| public: |
| constexpr tuple() |
| : _Inherited() { } |
| |
| explicit |
| constexpr tuple(const _Elements&... __elements) |
| : _Inherited(__elements...) { } |
| |
| template<typename... _UElements, typename = typename |
| enable_if<__and_<is_convertible<_UElements, |
| _Elements>...>::value>::type> |
| explicit |
| constexpr tuple(_UElements&&... __elements) |
| : _Inherited(std::forward<_UElements>(__elements)...) { } |
| |
| constexpr tuple(const tuple&) = default; |
| |
| constexpr tuple(tuple&&) = default; |
| |
| template<typename... _UElements, typename = typename |
| enable_if<__and_<is_convertible<const _UElements&, |
| _Elements>...>::value>::type> |
| constexpr tuple(const tuple<_UElements...>& __in) |
| : _Inherited(static_cast<const _Tuple_impl<0, _UElements...>&>(__in)) |
| { } |
| |
| template<typename... _UElements, typename = typename |
| enable_if<__and_<is_convertible<_UElements, |
| _Elements>...>::value>::type> |
| constexpr tuple(tuple<_UElements...>&& __in) |
| : _Inherited(static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) { } |
| |
| // Allocator-extended constructors. |
| |
| template<typename _Alloc> |
| tuple(allocator_arg_t __tag, const _Alloc& __a) |
| : _Inherited(__tag, __a) { } |
| |
| template<typename _Alloc> |
| tuple(allocator_arg_t __tag, const _Alloc& __a, |
| const _Elements&... __elements) |
| : _Inherited(__tag, __a, __elements...) { } |
| |
| template<typename _Alloc, typename... _UElements, typename = typename |
| enable_if<sizeof...(_UElements) |
| == sizeof...(_Elements)>::type> |
| tuple(allocator_arg_t __tag, const _Alloc& __a, |
| _UElements&&... __elements) |
| : _Inherited(__tag, __a, std::forward<_UElements>(__elements)...) |
| { } |
| |
| template<typename _Alloc> |
| tuple(allocator_arg_t __tag, const _Alloc& __a, const tuple& __in) |
| : _Inherited(__tag, __a, static_cast<const _Inherited&>(__in)) { } |
| |
| template<typename _Alloc> |
| tuple(allocator_arg_t __tag, const _Alloc& __a, tuple&& __in) |
| : _Inherited(__tag, __a, static_cast<_Inherited&&>(__in)) { } |
| |
| template<typename _Alloc, typename... _UElements, typename = typename |
| enable_if<sizeof...(_UElements) |
| == sizeof...(_Elements)>::type> |
| tuple(allocator_arg_t __tag, const _Alloc& __a, |
| const tuple<_UElements...>& __in) |
| : _Inherited(__tag, __a, |
| static_cast<const _Tuple_impl<0, _UElements...>&>(__in)) |
| { } |
| |
| template<typename _Alloc, typename... _UElements, typename = typename |
| enable_if<sizeof...(_UElements) |
| == sizeof...(_Elements)>::type> |
| tuple(allocator_arg_t __tag, const _Alloc& __a, |
| tuple<_UElements...>&& __in) |
| : _Inherited(__tag, __a, |
| static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) |
| { } |
| |
| tuple& |
| operator=(const tuple& __in) |
| { |
| static_cast<_Inherited&>(*this) = __in; |
| return *this; |
| } |
| |
| tuple& |
| operator=(tuple&& __in) |
| noexcept(is_nothrow_move_assignable<_Inherited>::value) |
| { |
| static_cast<_Inherited&>(*this) = std::move(__in); |
| return *this; |
| } |
| |
| template<typename... _UElements, typename = typename |
| enable_if<sizeof...(_UElements) |
| == sizeof...(_Elements)>::type> |
| tuple& |
| operator=(const tuple<_UElements...>& __in) |
| { |
| static_cast<_Inherited&>(*this) = __in; |
| return *this; |
| } |
| |
| template<typename... _UElements, typename = typename |
| enable_if<sizeof...(_UElements) |
| == sizeof...(_Elements)>::type> |
| tuple& |
| operator=(tuple<_UElements...>&& __in) |
| { |
| static_cast<_Inherited&>(*this) = std::move(__in); |
| return *this; |
| } |
| |
| void |
| swap(tuple& __in) |
| noexcept(noexcept(__in._M_swap(__in))) |
| { _Inherited::_M_swap(__in); } |
| }; |
| |
| // Explicit specialization, zero-element tuple. |
| template<> |
| class tuple<> |
| { |
| public: |
| void swap(tuple&) noexcept { /* no-op */ } |
| }; |
| |
| /// Partial specialization, 2-element tuple. |
| /// Includes construction and assignment from a pair. |
| template<typename _T1, typename _T2> |
| class tuple<_T1, _T2> : public _Tuple_impl<0, _T1, _T2> |
| { |
| typedef _Tuple_impl<0, _T1, _T2> _Inherited; |
| |
| public: |
| constexpr tuple() |
| : _Inherited() { } |
| |
| explicit |
| constexpr tuple(const _T1& __a1, const _T2& __a2) |
| : _Inherited(__a1, __a2) { } |
| |
| template<typename _U1, typename _U2, typename = typename |
| enable_if<__and_<is_convertible<_U1, _T1>, |
| is_convertible<_U2, _T2>>::value>::type> |
| explicit |
| constexpr tuple(_U1&& __a1, _U2&& __a2) |
| : _Inherited(std::forward<_U1>(__a1), std::forward<_U2>(__a2)) { } |
| |
| constexpr tuple(const tuple&) = default; |
| |
| constexpr tuple(tuple&&) = default; |
| |
| template<typename _U1, typename _U2, typename = typename |
| enable_if<__and_<is_convertible<const _U1&, _T1>, |
| is_convertible<const _U2&, _T2>>::value>::type> |
| constexpr tuple(const tuple<_U1, _U2>& __in) |
| : _Inherited(static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in)) { } |
| |
| template<typename _U1, typename _U2, typename = typename |
| enable_if<__and_<is_convertible<_U1, _T1>, |
| is_convertible<_U2, _T2>>::value>::type> |
| constexpr tuple(tuple<_U1, _U2>&& __in) |
| : _Inherited(static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in)) { } |
| |
| template<typename _U1, typename _U2, typename = typename |
| enable_if<__and_<is_convertible<const _U1&, _T1>, |
| is_convertible<const _U2&, _T2>>::value>::type> |
| constexpr tuple(const pair<_U1, _U2>& __in) |
| : _Inherited(__in.first, __in.second) { } |
| |
| template<typename _U1, typename _U2, typename = typename |
| enable_if<__and_<is_convertible<_U1, _T1>, |
| is_convertible<_U2, _T2>>::value>::type> |
| constexpr tuple(pair<_U1, _U2>&& __in) |
| : _Inherited(std::forward<_U1>(__in.first), |
| std::forward<_U2>(__in.second)) { } |
| |
| // Allocator-extended constructors. |
| |
| template<typename _Alloc> |
| tuple(allocator_arg_t __tag, const _Alloc& __a) |
| : _Inherited(__tag, __a) { } |
| |
| template<typename _Alloc> |
| tuple(allocator_arg_t __tag, const _Alloc& __a, |
| const _T1& __a1, const _T2& __a2) |
| : _Inherited(__tag, __a, __a1, __a2) { } |
| |
| template<typename _Alloc, typename _U1, typename _U2> |
| tuple(allocator_arg_t __tag, const _Alloc& __a, _U1&& __a1, _U2&& __a2) |
| : _Inherited(__tag, __a, std::forward<_U1>(__a1), |
| std::forward<_U2>(__a2)) { } |
| |
| template<typename _Alloc> |
| tuple(allocator_arg_t __tag, const _Alloc& __a, const tuple& __in) |
| : _Inherited(__tag, __a, static_cast<const _Inherited&>(__in)) { } |
| |
| template<typename _Alloc> |
| tuple(allocator_arg_t __tag, const _Alloc& __a, tuple&& __in) |
| : _Inherited(__tag, __a, static_cast<_Inherited&&>(__in)) { } |
| |
| template<typename _Alloc, typename _U1, typename _U2> |
| tuple(allocator_arg_t __tag, const _Alloc& __a, |
| const tuple<_U1, _U2>& __in) |
| : _Inherited(__tag, __a, |
| static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in)) |
| { } |
| |
| template<typename _Alloc, typename _U1, typename _U2> |
| tuple(allocator_arg_t __tag, const _Alloc& __a, tuple<_U1, _U2>&& __in) |
| : _Inherited(__tag, __a, static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in)) |
| { } |
| |
| template<typename _Alloc, typename _U1, typename _U2> |
| tuple(allocator_arg_t __tag, const _Alloc& __a, |
| const pair<_U1, _U2>& __in) |
| : _Inherited(__tag, __a, __in.first, __in.second) { } |
| |
| template<typename _Alloc, typename _U1, typename _U2> |
| tuple(allocator_arg_t __tag, const _Alloc& __a, pair<_U1, _U2>&& __in) |
| : _Inherited(__tag, __a, std::forward<_U1>(__in.first), |
| std::forward<_U2>(__in.second)) { } |
| |
| tuple& |
| operator=(const tuple& __in) |
| { |
| static_cast<_Inherited&>(*this) = __in; |
| return *this; |
| } |
| |
| tuple& |
| operator=(tuple&& __in) |
| noexcept(is_nothrow_move_assignable<_Inherited>::value) |
| { |
| static_cast<_Inherited&>(*this) = std::move(__in); |
| return *this; |
| } |
| |
| template<typename _U1, typename _U2> |
| tuple& |
| operator=(const tuple<_U1, _U2>& __in) |
| { |
| static_cast<_Inherited&>(*this) = __in; |
| return *this; |
| } |
| |
| template<typename _U1, typename _U2> |
| tuple& |
| operator=(tuple<_U1, _U2>&& __in) |
| { |
| static_cast<_Inherited&>(*this) = std::move(__in); |
| return *this; |
| } |
| |
| template<typename _U1, typename _U2> |
| tuple& |
| operator=(const pair<_U1, _U2>& __in) |
| { |
| this->_M_head(*this) = __in.first; |
| this->_M_tail(*this)._M_head(*this) = __in.second; |
| return *this; |
| } |
| |
| template<typename _U1, typename _U2> |
| tuple& |
| operator=(pair<_U1, _U2>&& __in) |
| { |
| this->_M_head(*this) = std::forward<_U1>(__in.first); |
| this->_M_tail(*this)._M_head(*this) = std::forward<_U2>(__in.second); |
| return *this; |
| } |
| |
| void |
| swap(tuple& __in) |
| noexcept(noexcept(__in._M_swap(__in))) |
| { _Inherited::_M_swap(__in); } |
| }; |
| |
| |
| /// Gives the type of the ith element of a given tuple type. |
| template<std::size_t __i, typename _Tp> |
| struct tuple_element; |
| |
| /** |
| * Recursive case for tuple_element: strip off the first element in |
| * the tuple and retrieve the (i-1)th element of the remaining tuple. |
| */ |
| template<std::size_t __i, typename _Head, typename... _Tail> |
| struct tuple_element<__i, tuple<_Head, _Tail...> > |
| : tuple_element<__i - 1, tuple<_Tail...> > { }; |
| |
| /** |
| * Basis case for tuple_element: The first element is the one we're seeking. |
| */ |
| template<typename _Head, typename... _Tail> |
| struct tuple_element<0, tuple<_Head, _Tail...> > |
| { |
| typedef _Head type; |
| }; |
| |
| // Duplicate of C++14's tuple_element_t for internal use in C++11 mode |
| template<std::size_t __i, typename _Tp> |
| using __tuple_element_t = typename tuple_element<__i, _Tp>::type; |
| |
| template<std::size_t __i, typename _Tp> |
| struct tuple_element<__i, const _Tp> |
| { |
| typedef typename add_const<__tuple_element_t<__i, _Tp>>::type type; |
| }; |
| |
| template<std::size_t __i, typename _Tp> |
| struct tuple_element<__i, volatile _Tp> |
| { |
| typedef typename add_volatile<__tuple_element_t<__i, _Tp>>::type type; |
| }; |
| |
| template<std::size_t __i, typename _Tp> |
| struct tuple_element<__i, const volatile _Tp> |
| { |
| typedef typename add_cv<__tuple_element_t<__i, _Tp>>::type type; |
| }; |
| |
| #if __cplusplus > 201103L |
| #define __cpp_lib_tuple_element_t 201402 |
| |
| template<std::size_t __i, typename _Tp> |
| using tuple_element_t = typename tuple_element<__i, _Tp>::type; |
| #endif |
| |
| /// Finds the size of a given tuple type. |
| template<typename _Tp> |
| struct tuple_size; |
| |
| // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| // 2313. tuple_size should always derive from integral_constant<size_t, N> |
| template<typename _Tp> |
| struct tuple_size<const _Tp> |
| : integral_constant<size_t, tuple_size<_Tp>::value> { }; |
| |
| template<typename _Tp> |
| struct tuple_size<volatile _Tp> |
| : integral_constant<size_t, tuple_size<_Tp>::value> { }; |
| |
| template<typename _Tp> |
| struct tuple_size<const volatile _Tp> |
| : integral_constant<size_t, tuple_size<_Tp>::value> { }; |
| |
| /// class tuple_size |
| template<typename... _Elements> |
| struct tuple_size<tuple<_Elements...>> |
| : public integral_constant<std::size_t, sizeof...(_Elements)> { }; |
| |
| template<std::size_t __i, typename _Head, typename... _Tail> |
| constexpr _Head& |
| __get_helper(_Tuple_impl<__i, _Head, _Tail...>& __t) noexcept |
| { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); } |
| |
| template<std::size_t __i, typename _Head, typename... _Tail> |
| constexpr const _Head& |
| __get_helper(const _Tuple_impl<__i, _Head, _Tail...>& __t) noexcept |
| { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); } |
| |
| /// Return a reference to the ith element of a tuple. |
| template<std::size_t __i, typename... _Elements> |
| constexpr __tuple_element_t<__i, tuple<_Elements...>>& |
| get(tuple<_Elements...>& __t) noexcept |
| { return std::__get_helper<__i>(__t); } |
| |
| /// Return a const reference to the ith element of a const tuple. |
| template<std::size_t __i, typename... _Elements> |
| constexpr const __tuple_element_t<__i, tuple<_Elements...>>& |
| get(const tuple<_Elements...>& __t) noexcept |
| { return std::__get_helper<__i>(__t); } |
| |
| /// Return an rvalue reference to the ith element of a tuple rvalue. |
| template<std::size_t __i, typename... _Elements> |
| constexpr __tuple_element_t<__i, tuple<_Elements...>>&& |
| get(tuple<_Elements...>&& __t) noexcept |
| { |
| typedef __tuple_element_t<__i, tuple<_Elements...>> __element_type; |
| return std::forward<__element_type&&>(std::get<__i>(__t)); |
| } |
| |
| #if __cplusplus > 201103L |
| |
| #define __cpp_lib_tuples_by_type 201304 |
| |
| template<typename _Head, size_t __i, typename... _Tail> |
| constexpr _Head& |
| __get_helper2(_Tuple_impl<__i, _Head, _Tail...>& __t) noexcept |
| { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); } |
| |
| template<typename _Head, size_t __i, typename... _Tail> |
| constexpr const _Head& |
| __get_helper2(const _Tuple_impl<__i, _Head, _Tail...>& __t) noexcept |
| { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); } |
| |
| /// Return a reference to the unique element of type _Tp of a tuple. |
| template <typename _Tp, typename... _Types> |
| constexpr _Tp& |
| get(tuple<_Types...>& __t) noexcept |
| { return std::__get_helper2<_Tp>(__t); } |
| |
| /// Return a reference to the unique element of type _Tp of a tuple rvalue. |
| template <typename _Tp, typename... _Types> |
| constexpr _Tp&& |
| get(tuple<_Types...>&& __t) noexcept |
| { return std::forward<_Tp&&>(std::__get_helper2<_Tp>(__t)); } |
| |
| /// Return a const reference to the unique element of type _Tp of a tuple. |
| template <typename _Tp, typename... _Types> |
| constexpr const _Tp& |
| get(const tuple<_Types...>& __t) noexcept |
| { return std::__get_helper2<_Tp>(__t); } |
| #endif |
| |
| // This class performs the comparison operations on tuples |
| template<typename _Tp, typename _Up, size_t __i, size_t __size> |
| struct __tuple_compare |
| { |
| static constexpr bool |
| __eq(const _Tp& __t, const _Up& __u) |
| { |
| return bool(std::get<__i>(__t) == std::get<__i>(__u)) |
| && __tuple_compare<_Tp, _Up, __i + 1, __size>::__eq(__t, __u); |
| } |
| |
| static constexpr bool |
| __less(const _Tp& __t, const _Up& __u) |
| { |
| return bool(std::get<__i>(__t) < std::get<__i>(__u)) |
| || (!bool(std::get<__i>(__u) < std::get<__i>(__t)) |
| && __tuple_compare<_Tp, _Up, __i + 1, __size>::__less(__t, __u)); |
| } |
| }; |
| |
| template<typename _Tp, typename _Up, size_t __size> |
| struct __tuple_compare<_Tp, _Up, __size, __size> |
| { |
| static constexpr bool |
| __eq(const _Tp&, const _Up&) { return true; } |
| |
| static constexpr bool |
| __less(const _Tp&, const _Up&) { return false; } |
| }; |
| |
| template<typename... _TElements, typename... _UElements> |
| constexpr bool |
| operator==(const tuple<_TElements...>& __t, |
| const tuple<_UElements...>& __u) |
| { |
| static_assert(sizeof...(_TElements) == sizeof...(_UElements), |
| "tuple objects can only be compared if they have equal sizes."); |
| using __compare = __tuple_compare<tuple<_TElements...>, |
| tuple<_UElements...>, |
| 0, sizeof...(_TElements)>; |
| return __compare::__eq(__t, __u); |
| } |
| |
| template<typename... _TElements, typename... _UElements> |
| constexpr bool |
| operator<(const tuple<_TElements...>& __t, |
| const tuple<_UElements...>& __u) |
| { |
| static_assert(sizeof...(_TElements) == sizeof...(_UElements), |
| "tuple objects can only be compared if they have equal sizes."); |
| using __compare = __tuple_compare<tuple<_TElements...>, |
| tuple<_UElements...>, |
| 0, sizeof...(_TElements)>; |
| return __compare::__less(__t, __u); |
| } |
| |
| template<typename... _TElements, typename... _UElements> |
| constexpr bool |
| operator!=(const tuple<_TElements...>& __t, |
| const tuple<_UElements...>& __u) |
| { return !(__t == __u); } |
| |
| template<typename... _TElements, typename... _UElements> |
| constexpr bool |
| operator>(const tuple<_TElements...>& __t, |
| const tuple<_UElements...>& __u) |
| { return __u < __t; } |
| |
| template<typename... _TElements, typename... _UElements> |
| constexpr bool |
| operator<=(const tuple<_TElements...>& __t, |
| const tuple<_UElements...>& __u) |
| { return !(__u < __t); } |
| |
| template<typename... _TElements, typename... _UElements> |
| constexpr bool |
| operator>=(const tuple<_TElements...>& __t, |
| const tuple<_UElements...>& __u) |
| { return !(__t < __u); } |
| |
| // NB: DR 705. |
| template<typename... _Elements> |
| constexpr tuple<typename __decay_and_strip<_Elements>::__type...> |
| make_tuple(_Elements&&... __args) |
| { |
| typedef tuple<typename __decay_and_strip<_Elements>::__type...> |
| __result_type; |
| return __result_type(std::forward<_Elements>(__args)...); |
| } |
| |
| template<typename... _Elements> |
| tuple<_Elements&&...> |
| forward_as_tuple(_Elements&&... __args) noexcept |
| { return tuple<_Elements&&...>(std::forward<_Elements>(__args)...); } |
| |
| template<typename> |
| struct __is_tuple_like_impl : false_type |
| { }; |
| |
| template<typename... _Tps> |
| struct __is_tuple_like_impl<tuple<_Tps...>> : true_type |
| { }; |
| |
| template<typename _T1, typename _T2> |
| struct __is_tuple_like_impl<pair<_T1, _T2>> : true_type |
| { }; |
| |
| template<typename _Tp, std::size_t _Nm> |
| struct __is_tuple_like_impl<array<_Tp, _Nm>> : true_type |
| { }; |
| |
| // Internal type trait that allows us to sfinae-protect tuple_cat. |
| template<typename _Tp> |
| struct __is_tuple_like |
| : public __is_tuple_like_impl<typename std::remove_cv |
| <typename std::remove_reference<_Tp>::type>::type>::type |
| { }; |
| |
| template<size_t, typename, typename, size_t> |
| struct __make_tuple_impl; |
| |
| template<size_t _Idx, typename _Tuple, typename... _Tp, size_t _Nm> |
| struct __make_tuple_impl<_Idx, tuple<_Tp...>, _Tuple, _Nm> |
| : __make_tuple_impl<_Idx + 1, |
| tuple<_Tp..., __tuple_element_t<_Idx, _Tuple>>, |
| _Tuple, _Nm> |
| { }; |
| |
| template<std::size_t _Nm, typename _Tuple, typename... _Tp> |
| struct __make_tuple_impl<_Nm, tuple<_Tp...>, _Tuple, _Nm> |
| { |
| typedef tuple<_Tp...> __type; |
| }; |
| |
| template<typename _Tuple> |
| struct __do_make_tuple |
| : __make_tuple_impl<0, tuple<>, _Tuple, std::tuple_size<_Tuple>::value> |
| { }; |
| |
| // Returns the std::tuple equivalent of a tuple-like type. |
| template<typename _Tuple> |
| struct __make_tuple |
| : public __do_make_tuple<typename std::remove_cv |
| <typename std::remove_reference<_Tuple>::type>::type> |
| { }; |
| |
| // Combines several std::tuple's into a single one. |
| template<typename...> |
| struct __combine_tuples; |
| |
| template<> |
| struct __combine_tuples<> |
| { |
| typedef tuple<> __type; |
| }; |
| |
| template<typename... _Ts> |
| struct __combine_tuples<tuple<_Ts...>> |
| { |
| typedef tuple<_Ts...> __type; |
| }; |
| |
| template<typename... _T1s, typename... _T2s, typename... _Rem> |
| struct __combine_tuples<tuple<_T1s...>, tuple<_T2s...>, _Rem...> |
| { |
| typedef typename __combine_tuples<tuple<_T1s..., _T2s...>, |
| _Rem...>::__type __type; |
| }; |
| |
| // Computes the result type of tuple_cat given a set of tuple-like types. |
| template<typename... _Tpls> |
| struct __tuple_cat_result |
| { |
| typedef typename __combine_tuples |
| <typename __make_tuple<_Tpls>::__type...>::__type __type; |
| }; |
| |
| // Helper to determine the index set for the first tuple-like |
| // type of a given set. |
| template<typename...> |
| struct __make_1st_indices; |
| |
| template<> |
| struct __make_1st_indices<> |
| { |
| typedef std::_Index_tuple<> __type; |
| }; |
| |
| template<typename _Tp, typename... _Tpls> |
| struct __make_1st_indices<_Tp, _Tpls...> |
| { |
| typedef typename std::_Build_index_tuple<std::tuple_size< |
| typename std::remove_reference<_Tp>::type>::value>::__type __type; |
| }; |
| |
| // Performs the actual concatenation by step-wise expanding tuple-like |
| // objects into the elements, which are finally forwarded into the |
| // result tuple. |
| template<typename _Ret, typename _Indices, typename... _Tpls> |
| struct __tuple_concater; |
| |
| template<typename _Ret, std::size_t... _Is, typename _Tp, typename... _Tpls> |
| struct __tuple_concater<_Ret, std::_Index_tuple<_Is...>, _Tp, _Tpls...> |
| { |
| template<typename... _Us> |
| static constexpr _Ret |
| _S_do(_Tp&& __tp, _Tpls&&... __tps, _Us&&... __us) |
| { |
| typedef typename __make_1st_indices<_Tpls...>::__type __idx; |
| typedef __tuple_concater<_Ret, __idx, _Tpls...> __next; |
| return __next::_S_do(std::forward<_Tpls>(__tps)..., |
| std::forward<_Us>(__us)..., |
| std::get<_Is>(std::forward<_Tp>(__tp))...); |
| } |
| }; |
| |
| template<typename _Ret> |
| struct __tuple_concater<_Ret, std::_Index_tuple<>> |
| { |
| template<typename... _Us> |
| static constexpr _Ret |
| _S_do(_Us&&... __us) |
| { |
| return _Ret(std::forward<_Us>(__us)...); |
| } |
| }; |
| |
| /// tuple_cat |
| template<typename... _Tpls, typename = typename |
| enable_if<__and_<__is_tuple_like<_Tpls>...>::value>::type> |
| constexpr auto |
| tuple_cat(_Tpls&&... __tpls) |
| -> typename __tuple_cat_result<_Tpls...>::__type |
| { |
| typedef typename __tuple_cat_result<_Tpls...>::__type __ret; |
| typedef typename __make_1st_indices<_Tpls...>::__type __idx; |
| typedef __tuple_concater<__ret, __idx, _Tpls...> __concater; |
| return __concater::_S_do(std::forward<_Tpls>(__tpls)...); |
| } |
| |
| /// tie |
| template<typename... _Elements> |
| inline tuple<_Elements&...> |
| tie(_Elements&... __args) noexcept |
| { return tuple<_Elements&...>(__args...); } |
| |
| /// swap |
| template<typename... _Elements> |
| inline void |
| swap(tuple<_Elements...>& __x, tuple<_Elements...>& __y) |
| noexcept(noexcept(__x.swap(__y))) |
| { __x.swap(__y); } |
| |
| // A class (and instance) which can be used in 'tie' when an element |
| // of a tuple is not required |
| struct _Swallow_assign |
| { |
| template<class _Tp> |
| const _Swallow_assign& |
| operator=(const _Tp&) const |
| { return *this; } |
| }; |
| |
| const _Swallow_assign ignore{}; |
| |
| /// Partial specialization for tuples |
| template<typename... _Types, typename _Alloc> |
| struct uses_allocator<tuple<_Types...>, _Alloc> : true_type { }; |
| |
| // See stl_pair.h... |
| template<class _T1, class _T2> |
| template<typename... _Args1, typename... _Args2> |
| inline |
| pair<_T1, _T2>:: |
| pair(piecewise_construct_t, |
| tuple<_Args1...> __first, tuple<_Args2...> __second) |
| : pair(__first, __second, |
| typename _Build_index_tuple<sizeof...(_Args1)>::__type(), |
| typename _Build_index_tuple<sizeof...(_Args2)>::__type()) |
| { } |
| |
| template<class _T1, class _T2> |
| template<typename... _Args1, std::size_t... _Indexes1, |
| typename... _Args2, std::size_t... _Indexes2> |
| inline |
| pair<_T1, _T2>:: |
| pair(tuple<_Args1...>& __tuple1, tuple<_Args2...>& __tuple2, |
| _Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>) |
| : first(std::forward<_Args1>(std::get<_Indexes1>(__tuple1))...), |
| second(std::forward<_Args2>(std::get<_Indexes2>(__tuple2))...) |
| { } |
| |
| /// @} |
| |
| _GLIBCXX_END_NAMESPACE_VERSION |
| } // namespace std |
| |
| #endif // C++11 |
| |
| #endif // _GLIBCXX_TUPLE |
