3ecec1eff7
PR libstdc++/56785 * include/std/tuple (_Tuple_impl): Remove zero-element specialization and define one-element specialization. * testsuite/20_util/tuple/56785.cc: New. From-SVN: r219785
1183 lines
38 KiB
C++
1183 lines
38 KiB
C++
// <tuple> -*- C++ -*-
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// Copyright (C) 2007-2015 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file include/tuple
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* This is a Standard C++ Library header.
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*/
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#ifndef _GLIBCXX_TUPLE
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#define _GLIBCXX_TUPLE 1
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#pragma GCC system_header
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#if __cplusplus < 201103L
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# include <bits/c++0x_warning.h>
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#else
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#include <utility>
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#include <array>
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#include <bits/uses_allocator.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @addtogroup utilities
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* @{
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*/
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template<std::size_t _Idx, typename _Head, bool _IsEmptyNotFinal>
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struct _Head_base;
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template<std::size_t _Idx, typename _Head>
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struct _Head_base<_Idx, _Head, true>
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: public _Head
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{
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constexpr _Head_base()
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: _Head() { }
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constexpr _Head_base(const _Head& __h)
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: _Head(__h) { }
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constexpr _Head_base(const _Head_base&) = default;
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constexpr _Head_base(_Head_base&&) = default;
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template<typename _UHead>
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constexpr _Head_base(_UHead&& __h)
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: _Head(std::forward<_UHead>(__h)) { }
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_Head_base(allocator_arg_t, __uses_alloc0)
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: _Head() { }
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template<typename _Alloc>
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_Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a)
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: _Head(allocator_arg, *__a._M_a) { }
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template<typename _Alloc>
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_Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a)
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: _Head(*__a._M_a) { }
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template<typename _UHead>
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_Head_base(__uses_alloc0, _UHead&& __uhead)
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: _Head(std::forward<_UHead>(__uhead)) { }
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template<typename _Alloc, typename _UHead>
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_Head_base(__uses_alloc1<_Alloc> __a, _UHead&& __uhead)
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: _Head(allocator_arg, *__a._M_a, std::forward<_UHead>(__uhead)) { }
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template<typename _Alloc, typename _UHead>
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_Head_base(__uses_alloc2<_Alloc> __a, _UHead&& __uhead)
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: _Head(std::forward<_UHead>(__uhead), *__a._M_a) { }
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static constexpr _Head&
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_M_head(_Head_base& __b) noexcept { return __b; }
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static constexpr const _Head&
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_M_head(const _Head_base& __b) noexcept { return __b; }
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};
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template<std::size_t _Idx, typename _Head>
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struct _Head_base<_Idx, _Head, false>
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{
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constexpr _Head_base()
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: _M_head_impl() { }
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constexpr _Head_base(const _Head& __h)
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: _M_head_impl(__h) { }
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constexpr _Head_base(const _Head_base&) = default;
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constexpr _Head_base(_Head_base&&) = default;
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template<typename _UHead>
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constexpr _Head_base(_UHead&& __h)
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: _M_head_impl(std::forward<_UHead>(__h)) { }
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_Head_base(allocator_arg_t, __uses_alloc0)
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: _M_head_impl() { }
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template<typename _Alloc>
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_Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a)
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: _M_head_impl(allocator_arg, *__a._M_a) { }
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template<typename _Alloc>
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_Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a)
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: _M_head_impl(*__a._M_a) { }
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template<typename _UHead>
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_Head_base(__uses_alloc0, _UHead&& __uhead)
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: _M_head_impl(std::forward<_UHead>(__uhead)) { }
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template<typename _Alloc, typename _UHead>
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_Head_base(__uses_alloc1<_Alloc> __a, _UHead&& __uhead)
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: _M_head_impl(allocator_arg, *__a._M_a, std::forward<_UHead>(__uhead))
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{ }
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template<typename _Alloc, typename _UHead>
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_Head_base(__uses_alloc2<_Alloc> __a, _UHead&& __uhead)
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: _M_head_impl(std::forward<_UHead>(__uhead), *__a._M_a) { }
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static constexpr _Head&
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_M_head(_Head_base& __b) noexcept { return __b._M_head_impl; }
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static constexpr const _Head&
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_M_head(const _Head_base& __b) noexcept { return __b._M_head_impl; }
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_Head _M_head_impl;
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};
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/**
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* Contains the actual implementation of the @c tuple template, stored
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* as a recursive inheritance hierarchy from the first element (most
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* derived class) to the last (least derived class). The @c Idx
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* parameter gives the 0-based index of the element stored at this
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* point in the hierarchy; we use it to implement a constant-time
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* get() operation.
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*/
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template<std::size_t _Idx, typename... _Elements>
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struct _Tuple_impl;
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template<typename _Tp>
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struct __is_empty_non_tuple : is_empty<_Tp> { };
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// Using EBO for elements that are tuples causes ambiguous base errors.
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template<typename _El0, typename... _El>
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struct __is_empty_non_tuple<tuple<_El0, _El...>> : false_type { };
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// Use the Empty Base-class Optimization for empty, non-final types.
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template<typename _Tp>
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using __empty_not_final
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= typename conditional<__is_final(_Tp), false_type,
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__is_empty_non_tuple<_Tp>>::type;
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/**
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* Recursive tuple implementation. Here we store the @c Head element
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* and derive from a @c Tuple_impl containing the remaining elements
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* (which contains the @c Tail).
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*/
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template<std::size_t _Idx, typename _Head, typename... _Tail>
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struct _Tuple_impl<_Idx, _Head, _Tail...>
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: public _Tuple_impl<_Idx + 1, _Tail...>,
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private _Head_base<_Idx, _Head, __empty_not_final<_Head>::value>
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{
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template<std::size_t, typename...> friend class _Tuple_impl;
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typedef _Tuple_impl<_Idx + 1, _Tail...> _Inherited;
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typedef _Head_base<_Idx, _Head, __empty_not_final<_Head>::value> _Base;
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static constexpr _Head&
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_M_head(_Tuple_impl& __t) noexcept { return _Base::_M_head(__t); }
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static constexpr const _Head&
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_M_head(const _Tuple_impl& __t) noexcept { return _Base::_M_head(__t); }
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static constexpr _Inherited&
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_M_tail(_Tuple_impl& __t) noexcept { return __t; }
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static constexpr const _Inherited&
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_M_tail(const _Tuple_impl& __t) noexcept { return __t; }
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constexpr _Tuple_impl()
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: _Inherited(), _Base() { }
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explicit
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constexpr _Tuple_impl(const _Head& __head, const _Tail&... __tail)
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: _Inherited(__tail...), _Base(__head) { }
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template<typename _UHead, typename... _UTail, typename = typename
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enable_if<sizeof...(_Tail) == sizeof...(_UTail)>::type>
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explicit
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constexpr _Tuple_impl(_UHead&& __head, _UTail&&... __tail)
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: _Inherited(std::forward<_UTail>(__tail)...),
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_Base(std::forward<_UHead>(__head)) { }
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constexpr _Tuple_impl(const _Tuple_impl&) = default;
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constexpr
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_Tuple_impl(_Tuple_impl&& __in)
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noexcept(__and_<is_nothrow_move_constructible<_Head>,
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is_nothrow_move_constructible<_Inherited>>::value)
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: _Inherited(std::move(_M_tail(__in))),
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_Base(std::forward<_Head>(_M_head(__in))) { }
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template<typename... _UElements>
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constexpr _Tuple_impl(const _Tuple_impl<_Idx, _UElements...>& __in)
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: _Inherited(_Tuple_impl<_Idx, _UElements...>::_M_tail(__in)),
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_Base(_Tuple_impl<_Idx, _UElements...>::_M_head(__in)) { }
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template<typename _UHead, typename... _UTails>
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constexpr _Tuple_impl(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
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: _Inherited(std::move
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(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))),
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_Base(std::forward<_UHead>
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(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))) { }
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template<typename _Alloc>
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_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a)
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: _Inherited(__tag, __a),
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_Base(__tag, __use_alloc<_Head>(__a)) { }
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template<typename _Alloc>
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_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
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const _Head& __head, const _Tail&... __tail)
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: _Inherited(__tag, __a, __tail...),
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_Base(__use_alloc<_Head, _Alloc, _Head>(__a), __head) { }
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template<typename _Alloc, typename _UHead, typename... _UTail,
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typename = typename enable_if<sizeof...(_Tail)
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== sizeof...(_UTail)>::type>
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_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
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_UHead&& __head, _UTail&&... __tail)
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: _Inherited(__tag, __a, std::forward<_UTail>(__tail)...),
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_Base(__use_alloc<_Head, _Alloc, _UHead>(__a),
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std::forward<_UHead>(__head)) { }
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template<typename _Alloc>
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_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
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const _Tuple_impl& __in)
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: _Inherited(__tag, __a, _M_tail(__in)),
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_Base(__use_alloc<_Head, _Alloc, _Head>(__a), _M_head(__in)) { }
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template<typename _Alloc>
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_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
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_Tuple_impl&& __in)
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: _Inherited(__tag, __a, std::move(_M_tail(__in))),
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_Base(__use_alloc<_Head, _Alloc, _Head>(__a),
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std::forward<_Head>(_M_head(__in))) { }
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template<typename _Alloc, typename... _UElements>
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_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
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const _Tuple_impl<_Idx, _UElements...>& __in)
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: _Inherited(__tag, __a,
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_Tuple_impl<_Idx, _UElements...>::_M_tail(__in)),
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_Base(__use_alloc<_Head, _Alloc, _Head>(__a),
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_Tuple_impl<_Idx, _UElements...>::_M_head(__in)) { }
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template<typename _Alloc, typename _UHead, typename... _UTails>
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_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
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_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
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: _Inherited(__tag, __a, std::move
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(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))),
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_Base(__use_alloc<_Head, _Alloc, _UHead>(__a),
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std::forward<_UHead>
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(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))) { }
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_Tuple_impl&
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operator=(const _Tuple_impl& __in)
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{
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_M_head(*this) = _M_head(__in);
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_M_tail(*this) = _M_tail(__in);
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return *this;
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}
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_Tuple_impl&
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operator=(_Tuple_impl&& __in)
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noexcept(__and_<is_nothrow_move_assignable<_Head>,
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is_nothrow_move_assignable<_Inherited>>::value)
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{
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_M_head(*this) = std::forward<_Head>(_M_head(__in));
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_M_tail(*this) = std::move(_M_tail(__in));
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return *this;
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}
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template<typename... _UElements>
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_Tuple_impl&
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operator=(const _Tuple_impl<_Idx, _UElements...>& __in)
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{
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_M_head(*this) = _Tuple_impl<_Idx, _UElements...>::_M_head(__in);
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_M_tail(*this) = _Tuple_impl<_Idx, _UElements...>::_M_tail(__in);
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return *this;
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}
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template<typename _UHead, typename... _UTails>
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_Tuple_impl&
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operator=(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
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{
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_M_head(*this) = std::forward<_UHead>
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(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in));
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_M_tail(*this) = std::move
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(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in));
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return *this;
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}
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protected:
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void
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_M_swap(_Tuple_impl& __in)
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noexcept(noexcept(swap(std::declval<_Head&>(),
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std::declval<_Head&>()))
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&& noexcept(_M_tail(__in)._M_swap(_M_tail(__in))))
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{
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using std::swap;
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swap(_M_head(*this), _M_head(__in));
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_Inherited::_M_swap(_M_tail(__in));
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}
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};
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// Basis case of inheritance recursion.
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template<std::size_t _Idx, typename _Head>
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struct _Tuple_impl<_Idx, _Head>
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: private _Head_base<_Idx, _Head, __empty_not_final<_Head>::value>
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{
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template<std::size_t, typename...> friend class _Tuple_impl;
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typedef _Head_base<_Idx, _Head, __empty_not_final<_Head>::value> _Base;
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static constexpr _Head&
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_M_head(_Tuple_impl& __t) noexcept { return _Base::_M_head(__t); }
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static constexpr const _Head&
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_M_head(const _Tuple_impl& __t) noexcept { return _Base::_M_head(__t); }
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constexpr _Tuple_impl()
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: _Base() { }
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explicit
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constexpr _Tuple_impl(const _Head& __head)
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: _Base(__head) { }
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template<typename _UHead>
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explicit
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constexpr _Tuple_impl(_UHead&& __head)
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: _Base(std::forward<_UHead>(__head)) { }
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constexpr _Tuple_impl(const _Tuple_impl&) = default;
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constexpr
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_Tuple_impl(_Tuple_impl&& __in)
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noexcept(is_nothrow_move_constructible<_Head>::value)
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: _Base(std::forward<_Head>(_M_head(__in))) { }
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template<typename _UHead>
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constexpr _Tuple_impl(const _Tuple_impl<_Idx, _UHead>& __in)
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: _Base(_Tuple_impl<_Idx, _UHead>::_M_head(__in)) { }
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template<typename _UHead>
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constexpr _Tuple_impl(_Tuple_impl<_Idx, _UHead>&& __in)
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: _Base(std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in)))
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{ }
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template<typename _Alloc>
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_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a)
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: _Base(__tag, __use_alloc<_Head>(__a)) { }
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template<typename _Alloc>
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_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
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const _Head& __head)
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: _Base(__use_alloc<_Head, _Alloc, _Head>(__a), __head) { }
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template<typename _Alloc, typename _UHead>
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_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
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_UHead&& __head)
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: _Base(__use_alloc<_Head, _Alloc, _UHead>(__a),
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std::forward<_UHead>(__head)) { }
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template<typename _Alloc>
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_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
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const _Tuple_impl& __in)
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: _Base(__use_alloc<_Head, _Alloc, _Head>(__a), _M_head(__in)) { }
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template<typename _Alloc>
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_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
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_Tuple_impl&& __in)
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: _Base(__use_alloc<_Head, _Alloc, _Head>(__a),
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std::forward<_Head>(_M_head(__in))) { }
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template<typename _Alloc, typename _UHead>
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_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
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const _Tuple_impl<_Idx, _UHead>& __in)
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: _Base(__use_alloc<_Head, _Alloc, _Head>(__a),
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_Tuple_impl<_Idx, _UHead>::_M_head(__in)) { }
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template<typename _Alloc, typename _UHead>
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_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
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_Tuple_impl<_Idx, _UHead>&& __in)
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: _Base(__use_alloc<_Head, _Alloc, _UHead>(__a),
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std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in)))
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{ }
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_Tuple_impl&
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operator=(const _Tuple_impl& __in)
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{
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_M_head(*this) = _M_head(__in);
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return *this;
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}
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_Tuple_impl&
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operator=(_Tuple_impl&& __in)
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noexcept(is_nothrow_move_assignable<_Head>::value)
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{
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_M_head(*this) = std::forward<_Head>(_M_head(__in));
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return *this;
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}
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template<typename _UHead>
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_Tuple_impl&
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operator=(const _Tuple_impl<_Idx, _UHead>& __in)
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{
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_M_head(*this) = _Tuple_impl<_Idx, _UHead>::_M_head(__in);
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return *this;
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}
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template<typename _UHead>
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_Tuple_impl&
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operator=(_Tuple_impl<_Idx, _UHead>&& __in)
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{
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_M_head(*this)
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= std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in));
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return *this;
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}
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protected:
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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
|