mirrored from git://gcc.gnu.org/git/gcc.git
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tuple
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/
tuple
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// <tuple> -*- C++ -*-
// Copyright (C) 2007-2024 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 <bits/stl_pair.h> // for std::pair
#include <bits/uses_allocator.h> // for std::allocator_arg_t
#include <bits/utility.h> // for std::tuple_size etc.
#include <bits/invoke.h> // for std::__invoke
#if __cplusplus > 201703L
# include <compare>
# include <bits/ranges_util.h> // for std::ranges::subrange
#endif
#define __glibcxx_want_constexpr_tuple
#define __glibcxx_want_tuple_element_t
#define __glibcxx_want_tuples_by_type
#define __glibcxx_want_apply
#define __glibcxx_want_make_from_tuple
#define __glibcxx_want_ranges_zip
#define __glibcxx_want_tuple_like
#define __glibcxx_want_constrained_equality
#include <bits/version.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @addtogroup utilities
* @{
*/
template<typename... _Elements>
class tuple;
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
= __conditional_t<__is_final(_Tp), false_type,
__is_empty_non_tuple<_Tp>>;
template<size_t _Idx, typename _Head,
bool = __empty_not_final<_Head>::value>
struct _Head_base;
#if __has_cpp_attribute(__no_unique_address__)
template<size_t _Idx, typename _Head>
struct _Head_base<_Idx, _Head, true>
{
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)) { }
_GLIBCXX20_CONSTEXPR
_Head_base(allocator_arg_t, __uses_alloc0)
: _M_head_impl() { }
template<typename _Alloc>
_GLIBCXX20_CONSTEXPR
_Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a)
: _M_head_impl(allocator_arg, *__a._M_a) { }
template<typename _Alloc>
_GLIBCXX20_CONSTEXPR
_Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a)
: _M_head_impl(*__a._M_a) { }
template<typename _UHead>
_GLIBCXX20_CONSTEXPR
_Head_base(__uses_alloc0, _UHead&& __uhead)
: _M_head_impl(std::forward<_UHead>(__uhead)) { }
template<typename _Alloc, typename _UHead>
_GLIBCXX20_CONSTEXPR
_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>
_GLIBCXX20_CONSTEXPR
_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; }
[[__no_unique_address__]] _Head _M_head_impl;
};
#else
template<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)) { }
_GLIBCXX20_CONSTEXPR
_Head_base(allocator_arg_t, __uses_alloc0)
: _Head() { }
template<typename _Alloc>
_GLIBCXX20_CONSTEXPR
_Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a)
: _Head(allocator_arg, *__a._M_a) { }
template<typename _Alloc>
_GLIBCXX20_CONSTEXPR
_Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a)
: _Head(*__a._M_a) { }
template<typename _UHead>
_GLIBCXX20_CONSTEXPR
_Head_base(__uses_alloc0, _UHead&& __uhead)
: _Head(std::forward<_UHead>(__uhead)) { }
template<typename _Alloc, typename _UHead>
_GLIBCXX20_CONSTEXPR
_Head_base(__uses_alloc1<_Alloc> __a, _UHead&& __uhead)
: _Head(allocator_arg, *__a._M_a, std::forward<_UHead>(__uhead)) { }
template<typename _Alloc, typename _UHead>
_GLIBCXX20_CONSTEXPR
_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; }
};
#endif
template<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)) { }
_GLIBCXX20_CONSTEXPR
_Head_base(allocator_arg_t, __uses_alloc0)
: _M_head_impl() { }
template<typename _Alloc>
_GLIBCXX20_CONSTEXPR
_Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a)
: _M_head_impl(allocator_arg, *__a._M_a) { }
template<typename _Alloc>
_GLIBCXX20_CONSTEXPR
_Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a)
: _M_head_impl(*__a._M_a) { }
template<typename _UHead>
_GLIBCXX20_CONSTEXPR
_Head_base(__uses_alloc0, _UHead&& __uhead)
: _M_head_impl(std::forward<_UHead>(__uhead)) { }
template<typename _Alloc, typename _UHead>
_GLIBCXX20_CONSTEXPR
_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>
_GLIBCXX20_CONSTEXPR
_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;
};
#if __cpp_lib_tuple_like // >= C++23
struct __tuple_like_tag_t { explicit __tuple_like_tag_t() = default; };
// This forward declaration is used by the operator<=> overload for
// tuple-like types.
template<typename _Cat, typename _Tp, typename _Up, typename _IndexSeq>
constexpr _Cat
__tuple_cmp(const _Tp& __t, const _Up& __u, _IndexSeq);
#endif // C++23
/**
* 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<size_t _Idx, typename... _Elements>
struct _Tuple_impl;
/**
* 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<size_t _Idx, typename _Head, typename... _Tail>
struct _Tuple_impl<_Idx, _Head, _Tail...>
: public _Tuple_impl<_Idx + 1, _Tail...>,
private _Head_base<_Idx, _Head>
{
template<size_t, typename...> friend struct _Tuple_impl;
typedef _Tuple_impl<_Idx + 1, _Tail...> _Inherited;
typedef _Head_base<_Idx, _Head> _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 = __enable_if_t<sizeof...(_Tail) == sizeof...(_UTail)>>
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;
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 2729. Missing SFINAE on std::pair::operator=
_Tuple_impl& operator=(const _Tuple_impl&) = delete;
_Tuple_impl(_Tuple_impl&&) = default;
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)))
{ }
#if __cpp_lib_ranges_zip // >= C++23
template<typename... _UElements>
constexpr
_Tuple_impl(_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(const _Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
: _Inherited(std::move
(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))),
_Base(std::forward<const _UHead>
(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in)))
{ }
#endif // C++23
#if __cpp_lib_tuple_like // >= C++23
template<typename _UTuple, size_t... _Is>
constexpr
_Tuple_impl(__tuple_like_tag_t, _UTuple&& __u, index_sequence<_Is...>)
: _Tuple_impl(std::get<_Is>(std::forward<_UTuple>(__u))...)
{ }
#endif // C++23
template<typename _Alloc>
_GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a)
: _Inherited(__tag, __a),
_Base(__tag, __use_alloc<_Head>(__a))
{ }
template<typename _Alloc>
_GLIBCXX20_CONSTEXPR
_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 = __enable_if_t<sizeof...(_Tail) == sizeof...(_UTail)>>
_GLIBCXX20_CONSTEXPR
_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>
_GLIBCXX20_CONSTEXPR
_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>
_GLIBCXX20_CONSTEXPR
_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 _UHead, typename... _UTails>
_GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
const _Tuple_impl<_Idx, _UHead, _UTails...>& __in)
: _Inherited(__tag, __a,
_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in)),
_Base(__use_alloc<_Head, _Alloc, const _UHead&>(__a),
_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))
{ }
template<typename _Alloc, typename _UHead, typename... _UTails>
_GLIBCXX20_CONSTEXPR
_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)))
{ }
#if __cpp_lib_ranges_zip // >= C++23
template<typename _Alloc, typename _UHead, typename... _UTails>
constexpr
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
_Tuple_impl<_Idx, _UHead, _UTails...>& __in)
: _Inherited(__tag, __a,
_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in)),
_Base(__use_alloc<_Head, _Alloc, _UHead&>(__a),
_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))
{ }
template<typename _Alloc, typename _UHead, typename... _UTails>
constexpr
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
const _Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
: _Inherited(__tag, __a, std::move
(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))),
_Base(__use_alloc<_Head, _Alloc, const _UHead>(__a),
std::forward<const _UHead>
(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in)))
{ }
#endif // C++23
#if __cpp_lib_tuple_like // >= C++23
template<typename _Alloc, typename _UTuple, size_t... _Is>
constexpr
_Tuple_impl(__tuple_like_tag_t, allocator_arg_t __tag, const _Alloc& __a,
_UTuple&& __u, index_sequence<_Is...>)
: _Tuple_impl(__tag, __a, std::get<_Is>(std::forward<_UTuple>(__u))...)
{ }
#endif // C++23
template<typename... _UElements>
_GLIBCXX20_CONSTEXPR
void
_M_assign(const _Tuple_impl<_Idx, _UElements...>& __in)
{
_M_head(*this) = _Tuple_impl<_Idx, _UElements...>::_M_head(__in);
_M_tail(*this)._M_assign(
_Tuple_impl<_Idx, _UElements...>::_M_tail(__in));
}
template<typename _UHead, typename... _UTails>
_GLIBCXX20_CONSTEXPR
void
_M_assign(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
{
_M_head(*this) = std::forward<_UHead>
(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in));
_M_tail(*this)._M_assign(
std::move(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in)));
}
#if __cpp_lib_ranges_zip // >= C++23
template<typename... _UElements>
constexpr void
_M_assign(const _Tuple_impl<_Idx, _UElements...>& __in) const
{
_M_head(*this) = _Tuple_impl<_Idx, _UElements...>::_M_head(__in);
_M_tail(*this)._M_assign(
_Tuple_impl<_Idx, _UElements...>::_M_tail(__in));
}
template<typename _UHead, typename... _UTails>
constexpr void
_M_assign(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in) const
{
_M_head(*this) = std::forward<_UHead>
(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in));
_M_tail(*this)._M_assign(
std::move(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in)));
}
#endif // C++23
#if __cpp_lib_tuple_like // >= C++23
template<typename _UTuple>
constexpr void
_M_assign(__tuple_like_tag_t __tag, _UTuple&& __u)
{
_M_head(*this) = std::get<_Idx>(std::forward<_UTuple>(__u));
_M_tail(*this)._M_assign(__tag, std::forward<_UTuple>(__u));
}
template<typename _UTuple>
constexpr void
_M_assign(__tuple_like_tag_t __tag, _UTuple&& __u) const
{
_M_head(*this) = std::get<_Idx>(std::forward<_UTuple>(__u));
_M_tail(*this)._M_assign(__tag, std::forward<_UTuple>(__u));
}
#endif // C++23
protected:
_GLIBCXX20_CONSTEXPR
void
_M_swap(_Tuple_impl& __in)
{
using std::swap;
swap(_M_head(*this), _M_head(__in));
_Inherited::_M_swap(_M_tail(__in));
}
#if __cpp_lib_ranges_zip // >= C++23
constexpr void
_M_swap(const _Tuple_impl& __in) const
{
using std::swap;
swap(_M_head(*this), _M_head(__in));
_Inherited::_M_swap(_M_tail(__in));
}
#endif // C++23
};
// Basis case of inheritance recursion.
template<size_t _Idx, typename _Head>
struct _Tuple_impl<_Idx, _Head>
: private _Head_base<_Idx, _Head>
{
template<size_t, typename...> friend struct _Tuple_impl;
typedef _Head_base<_Idx, _Head> _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;
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 2729. Missing SFINAE on std::pair::operator=
_Tuple_impl& operator=(const _Tuple_impl&) = delete;
#if _GLIBCXX_INLINE_VERSION
_Tuple_impl(_Tuple_impl&&) = default;
#else
constexpr
_Tuple_impl(_Tuple_impl&& __in)
noexcept(is_nothrow_move_constructible<_Head>::value)
: _Base(static_cast<_Base&&>(__in))
{ }
#endif
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)))
{ }
#if __cpp_lib_ranges_zip // >= C++23
template<typename _UHead>
constexpr
_Tuple_impl(_Tuple_impl<_Idx, _UHead>& __in)
: _Base(_Tuple_impl<_Idx, _UHead>::_M_head(__in))
{ }
template<typename _UHead>
constexpr
_Tuple_impl(const _Tuple_impl<_Idx, _UHead>&& __in)
: _Base(std::forward<const _UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in)))
{ }
#endif // C++23
#if __cpp_lib_tuple_like // >= C++23
template<typename _UTuple>
constexpr
_Tuple_impl(__tuple_like_tag_t, _UTuple&& __u, index_sequence<0>)
: _Tuple_impl(std::get<0>(std::forward<_UTuple>(__u)))
{ }
#endif // C++23
template<typename _Alloc>
_GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a)
: _Base(__tag, __use_alloc<_Head>(__a))
{ }
template<typename _Alloc>
_GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t, const _Alloc& __a,
const _Head& __head)
: _Base(__use_alloc<_Head, _Alloc, const _Head&>(__a), __head)
{ }
template<typename _Alloc, typename _UHead>
_GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t, const _Alloc& __a,
_UHead&& __head)
: _Base(__use_alloc<_Head, _Alloc, _UHead>(__a),
std::forward<_UHead>(__head))
{ }
template<typename _Alloc>
_GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t, const _Alloc& __a,
const _Tuple_impl& __in)
: _Base(__use_alloc<_Head, _Alloc, const _Head&>(__a), _M_head(__in))
{ }
template<typename _Alloc>
_GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t, const _Alloc& __a,
_Tuple_impl&& __in)
: _Base(__use_alloc<_Head, _Alloc, _Head>(__a),
std::forward<_Head>(_M_head(__in)))
{ }
template<typename _Alloc, typename _UHead>
_GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t, const _Alloc& __a,
const _Tuple_impl<_Idx, _UHead>& __in)
: _Base(__use_alloc<_Head, _Alloc, const _UHead&>(__a),
_Tuple_impl<_Idx, _UHead>::_M_head(__in))
{ }
template<typename _Alloc, typename _UHead>
_GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t, 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)))
{ }
#if __cpp_lib_ranges_zip // >= C++23
template<typename _Alloc, typename _UHead>
constexpr
_Tuple_impl(allocator_arg_t, const _Alloc& __a,
_Tuple_impl<_Idx, _UHead>& __in)
: _Base(__use_alloc<_Head, _Alloc, _UHead&>(__a),
_Tuple_impl<_Idx, _UHead>::_M_head(__in))
{ }
template<typename _Alloc, typename _UHead>
constexpr
_Tuple_impl(allocator_arg_t, const _Alloc& __a,
const _Tuple_impl<_Idx, _UHead>&& __in)
: _Base(__use_alloc<_Head, _Alloc, const _UHead>(__a),
std::forward<const _UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in)))
{ }
#endif // C++23
#if __cpp_lib_tuple_like // >= C++23
template<typename _Alloc, typename _UTuple>
constexpr
_Tuple_impl(__tuple_like_tag_t, allocator_arg_t __tag, const _Alloc& __a,
_UTuple&& __u, index_sequence<0>)
: _Tuple_impl(__tag, __a, std::get<0>(std::forward<_UTuple>(__u)))
{ }
#endif // C++23
template<typename _UHead>
_GLIBCXX20_CONSTEXPR
void
_M_assign(const _Tuple_impl<_Idx, _UHead>& __in)
{
_M_head(*this) = _Tuple_impl<_Idx, _UHead>::_M_head(__in);
}
template<typename _UHead>
_GLIBCXX20_CONSTEXPR
void
_M_assign(_Tuple_impl<_Idx, _UHead>&& __in)
{
_M_head(*this)
= std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in));
}
#if __cpp_lib_ranges_zip // >= C++23
template<typename _UHead>
constexpr void
_M_assign(const _Tuple_impl<_Idx, _UHead>& __in) const
{
_M_head(*this) = _Tuple_impl<_Idx, _UHead>::_M_head(__in);
}
template<typename _UHead>
constexpr void
_M_assign(_Tuple_impl<_Idx, _UHead>&& __in) const
{
_M_head(*this)
= std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in));
}
#endif // C++23
#if __cpp_lib_tuple_like // >= C++23
template<typename _UTuple>
constexpr void
_M_assign(__tuple_like_tag_t, _UTuple&& __u)
{ _M_head(*this) = std::get<_Idx>(std::forward<_UTuple>(__u)); }
template<typename _UTuple>
constexpr void
_M_assign(__tuple_like_tag_t, _UTuple&& __u) const
{ _M_head(*this) = std::get<_Idx>(std::forward<_UTuple>(__u)); }
#endif // C++23
protected:
_GLIBCXX20_CONSTEXPR
void
_M_swap(_Tuple_impl& __in)
{
using std::swap;
swap(_M_head(*this), _M_head(__in));
}
#if __cpp_lib_ranges_zip // >= C++23
constexpr void
_M_swap(const _Tuple_impl& __in) const
{
using std::swap;
swap(_M_head(*this), _M_head(__in));
}
#endif // C++23
};
// Concept utility functions, reused in conditionally-explicit
// constructors.
template<bool, typename... _Types>
struct _TupleConstraints
{
template<typename... _UTypes>
using __constructible = __and_<is_constructible<_Types, _UTypes>...>;
template<typename... _UTypes>
using __convertible = __and_<is_convertible<_UTypes, _Types>...>;
// Constraint for a non-explicit constructor.
// True iff each Ti in _Types... can be constructed from Ui in _UTypes...
// and every Ui is implicitly convertible to Ti.
template<typename... _UTypes>
static constexpr bool __is_implicitly_constructible()
{
return __and_<__constructible<_UTypes...>,
__convertible<_UTypes...>
>::value;
}
// Constraint for a non-explicit constructor.
// True iff each Ti in _Types... can be constructed from Ui in _UTypes...
// but not every Ui is implicitly convertible to Ti.
template<typename... _UTypes>
static constexpr bool __is_explicitly_constructible()
{
return __and_<__constructible<_UTypes...>,
__not_<__convertible<_UTypes...>>
>::value;
}
static constexpr bool __is_implicitly_default_constructible()
{
return __and_<std::__is_implicitly_default_constructible<_Types>...
>::value;
}
static constexpr bool __is_explicitly_default_constructible()
{
return __and_<is_default_constructible<_Types>...,
__not_<__and_<
std::__is_implicitly_default_constructible<_Types>...>
>>::value;
}
};
// Partial specialization used when a required precondition isn't met,
// e.g. when sizeof...(_Types) != sizeof...(_UTypes).
template<typename... _Types>
struct _TupleConstraints<false, _Types...>
{
template<typename... _UTypes>
static constexpr bool __is_implicitly_constructible()
{ return false; }
template<typename... _UTypes>
static constexpr bool __is_explicitly_constructible()
{ return false; }
};
/// Primary class template, tuple
template<typename... _Elements>
class tuple : public _Tuple_impl<0, _Elements...>
{
using _Inherited = _Tuple_impl<0, _Elements...>;
#if __cpp_concepts && __cpp_consteval && __cpp_conditional_explicit // >= C++20
template<typename... _UTypes>
static consteval bool
__constructible()
{
if constexpr (sizeof...(_UTypes) == sizeof...(_Elements))
return __and_v<is_constructible<_Elements, _UTypes>...>;
else
return false;
}
template<typename... _UTypes>
static consteval bool
__nothrow_constructible()
{
if constexpr (sizeof...(_UTypes) == sizeof...(_Elements))
return __and_v<is_nothrow_constructible<_Elements, _UTypes>...>;
else
return false;
}
template<typename... _UTypes>
static consteval bool
__convertible()
{
if constexpr (sizeof...(_UTypes) == sizeof...(_Elements))
return __and_v<is_convertible<_UTypes, _Elements>...>;
else
return false;
}
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 3121. tuple constructor constraints for UTypes&&... overloads
template<typename... _UTypes>
static consteval bool
__disambiguating_constraint()
{
if constexpr (sizeof...(_Elements) != sizeof...(_UTypes))
return false;
else if constexpr (sizeof...(_Elements) == 1)
{
using _U0 = typename _Nth_type<0, _UTypes...>::type;
return !is_same_v<remove_cvref_t<_U0>, tuple>;
}
else if constexpr (sizeof...(_Elements) < 4)
{
using _U0 = typename _Nth_type<0, _UTypes...>::type;
if constexpr (!is_same_v<remove_cvref_t<_U0>, allocator_arg_t>)
return true;
else
{
using _T0 = typename _Nth_type<0, _Elements...>::type;
return is_same_v<remove_cvref_t<_T0>, allocator_arg_t>;
}
}
return true;
}
// Return true iff sizeof...(Types) == 1 && tuple_size_v<TUPLE> == 1
// and the single element in Types can be initialized from TUPLE,
// or is the same type as tuple_element_t<0, TUPLE>.
template<typename _Tuple>
static consteval bool
__use_other_ctor()
{
if constexpr (sizeof...(_Elements) != 1)
return false;
else if constexpr (is_same_v<remove_cvref_t<_Tuple>, tuple>)
return true; // Should use a copy/move constructor instead.
else
{
using _Tp = typename _Nth_type<0, _Elements...>::type;
if constexpr (is_convertible_v<_Tuple, _Tp>)
return true;
else if constexpr (is_constructible_v<_Tp, _Tuple>)
return true;
}
return false;
}
template<typename... _Up>
static consteval bool
__dangles()
{
#if __has_builtin(__reference_constructs_from_temporary)
return (__reference_constructs_from_temporary(_Elements, _Up&&)
|| ...);
#else
return false;
#endif
}
#if __cpp_lib_tuple_like // >= C++23
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 4045. tuple can create dangling references from tuple-like
template<typename _UTuple>
static consteval bool
__dangles_from_tuple_like()
{
return []<size_t... _Is>(index_sequence<_Is...>) {
return __dangles<decltype(std::get<_Is>(std::declval<_UTuple>()))...>();
}(index_sequence_for<_Elements...>{});
}
template<typename _UTuple>
static consteval bool
__constructible_from_tuple_like()
{
return []<size_t... _Is>(index_sequence<_Is...>) {
return __constructible<decltype(std::get<_Is>(std::declval<_UTuple>()))...>();
}(index_sequence_for<_Elements...>{});
}
template<typename _UTuple>
static consteval bool
__convertible_from_tuple_like()
{
return []<size_t... _Is>(index_sequence<_Is...>) {
return __convertible<decltype(std::get<_Is>(std::declval<_UTuple>()))...>();
}(index_sequence_for<_Elements...>{});
}
#endif // C++23
public:
constexpr
explicit(!(__is_implicitly_default_constructible_v<_Elements> && ...))
tuple()
noexcept((is_nothrow_default_constructible_v<_Elements> && ...))
requires (is_default_constructible_v<_Elements> && ...)
: _Inherited()
{ }
constexpr explicit(!__convertible<const _Elements&...>())
tuple(const _Elements&... __elements)
noexcept(__nothrow_constructible<const _Elements&...>())
requires (__constructible<const _Elements&...>())
: _Inherited(__elements...)
{ }
template<typename... _UTypes>
requires (__disambiguating_constraint<_UTypes...>())
&& (__constructible<_UTypes...>())
&& (!__dangles<_UTypes...>())
constexpr explicit(!__convertible<_UTypes...>())
tuple(_UTypes&&... __u)
noexcept(__nothrow_constructible<_UTypes...>())
: _Inherited(std::forward<_UTypes>(__u)...)
{ }
template<typename... _UTypes>
requires (__disambiguating_constraint<_UTypes...>())
&& (__constructible<_UTypes...>())
&& (__dangles<_UTypes...>())
tuple(_UTypes&&...) = delete;
constexpr tuple(const tuple&) = default;
constexpr tuple(tuple&&) = default;
template<typename... _UTypes>
requires (__constructible<const _UTypes&...>())
&& (!__use_other_ctor<const tuple<_UTypes...>&>())
&& (!__dangles<const _UTypes&...>())
constexpr explicit(!__convertible<const _UTypes&...>())
tuple(const tuple<_UTypes...>& __u)
noexcept(__nothrow_constructible<const _UTypes&...>())
: _Inherited(static_cast<const _Tuple_impl<0, _UTypes...>&>(__u))
{ }