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llvm-project/libcxx/include/__cxx03/tuple
Nikolas Klauser 67432f2049
[libc++][C++03] Copy the LLVM 19 headers (#108999) 
This is the first part of the "Freezing C++03 headers" proposal
explained in
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319/58.

This patch mechanically copies the headers as of the LLVM 19.1 release
into a subdirectory of libc++ so that we can start using these headers
when building in C++03 mode. We are going to be backporting important
changes to that copy of the headers until the LLVM 21 release. After the
LLVM 21 release, only critical bugfixes will be fixed in the C++03 copy
of the headers.

This patch only performs a copy of the headers -- these headers are
still unused by the rest of the codebase.
2024-10-01 22:57:30 +02:00

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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_TUPLE
#define _LIBCPP_TUPLE
// clang-format off
/*
tuple synopsis
namespace std
{
template <class... T>
class tuple {
public:
explicit(see-below) constexpr tuple();
explicit(see-below) tuple(const T&...); // constexpr in C++14
template <class... U>
explicit(see-below) tuple(U&&...); // constexpr in C++14
tuple(const tuple&) = default;
tuple(tuple&&) = default;
template<class... UTypes>
constexpr explicit(see-below) tuple(tuple<UTypes...>&); // C++23
template <class... U>
explicit(see-below) tuple(const tuple<U...>&); // constexpr in C++14
template <class... U>
explicit(see-below) tuple(tuple<U...>&&); // constexpr in C++14
template<class... UTypes>
constexpr explicit(see-below) tuple(const tuple<UTypes...>&&); // C++23
template<class U1, class U2>
constexpr explicit(see-below) tuple(pair<U1, U2>&); // iff sizeof...(Types) == 2 // C++23
template <class U1, class U2>
explicit(see-below) tuple(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++14
template <class U1, class U2>
explicit(see-below) tuple(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++14
template<class U1, class U2>
constexpr explicit(see-below) tuple(const pair<U1, U2>&&); // iff sizeof...(Types) == 2 // C++23
// allocator-extended constructors
template <class Alloc>
tuple(allocator_arg_t, const Alloc& a);
template <class Alloc>
explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const T&...); // constexpr in C++20
template <class Alloc, class... U>
explicit(see-below) tuple(allocator_arg_t, const Alloc& a, U&&...); // constexpr in C++20
template <class Alloc>
tuple(allocator_arg_t, const Alloc& a, const tuple&); // constexpr in C++20
template <class Alloc>
tuple(allocator_arg_t, const Alloc& a, tuple&&); // constexpr in C++20
template<class Alloc, class... UTypes>
constexpr explicit(see-below)
tuple(allocator_arg_t, const Alloc& a, tuple<UTypes...>&); // C++23
template <class Alloc, class... U>
explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const tuple<U...>&); // constexpr in C++20
template <class Alloc, class... U>
explicit(see-below) tuple(allocator_arg_t, const Alloc& a, tuple<U...>&&); // constexpr in C++20
template<class Alloc, class... UTypes>
constexpr explicit(see-below)
tuple(allocator_arg_t, const Alloc& a, const tuple<UTypes...>&&); // C++23
template<class Alloc, class U1, class U2>
constexpr explicit(see-below)
tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&); // C++23
template <class Alloc, class U1, class U2>
explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&); // constexpr in C++20
template <class Alloc, class U1, class U2>
explicit(see-below) tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&&); // constexpr in C++20
template<class Alloc, class U1, class U2>
constexpr explicit(see-below)
tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&&); // C++23
tuple& operator=(const tuple&); // constexpr in C++20
constexpr const tuple& operator=(const tuple&) const; // C++23
tuple& operator=(tuple&&) noexcept(is_nothrow_move_assignable_v<T> && ...); // constexpr in C++20
constexpr const tuple& operator=(tuple&&) const; // C++23
template <class... U>
tuple& operator=(const tuple<U...>&); // constexpr in C++20
template<class... UTypes>
constexpr const tuple& operator=(const tuple<UTypes...>&) const; // C++23
template <class... U>
tuple& operator=(tuple<U...>&&); // constexpr in C++20
template<class... UTypes>
constexpr const tuple& operator=(tuple<UTypes...>&&) const; // C++23
template <class U1, class U2>
tuple& operator=(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++20
template<class U1, class U2>
constexpr const tuple& operator=(const pair<U1, U2>&) const; // iff sizeof...(Types) == 2 // C++23
template <class U1, class U2>
tuple& operator=(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++20
template<class U1, class U2>
constexpr const tuple& operator=(pair<U1, U2>&&) const; // iff sizeof...(Types) == 2 // C++23
template<class U, size_t N>
tuple& operator=(array<U, N> const&) // iff sizeof...(T) == N, EXTENSION
template<class U, size_t N>
tuple& operator=(array<U, N>&&) // iff sizeof...(T) == N, EXTENSION
void swap(tuple&) noexcept(AND(swap(declval<T&>(), declval<T&>())...)); // constexpr in C++20
constexpr void swap(const tuple&) const noexcept(see-below); // C++23
};
template<class... TTypes, class... UTypes, template<class> class TQual, template<class> class UQual> // since C++23
requires requires { typename tuple<common_reference_t<TQual<TTypes>, UQual<UTypes>>...>; }
struct basic_common_reference<tuple<TTypes...>, tuple<UTypes...>, TQual, UQual> {
using type = tuple<common_reference_t<TQual<TTypes>, UQual<UTypes>>...>;
};
template<class... TTypes, class... UTypes> // since C++23
requires requires { typename tuple<common_type_t<TTypes, UTypes>...>; }
struct common_type<tuple<TTypes...>, tuple<UTypes...>> {
using type = tuple<common_type_t<TTypes, UTypes>...>;
};
template <class ...T>
tuple(T...) -> tuple<T...>; // since C++17
template <class T1, class T2>
tuple(pair<T1, T2>) -> tuple<T1, T2>; // since C++17
template <class Alloc, class ...T>
tuple(allocator_arg_t, Alloc, T...) -> tuple<T...>; // since C++17
template <class Alloc, class T1, class T2>
tuple(allocator_arg_t, Alloc, pair<T1, T2>) -> tuple<T1, T2>; // since C++17
template <class Alloc, class ...T>
tuple(allocator_arg_t, Alloc, tuple<T...>) -> tuple<T...>; // since C++17
struct ignore-type { // exposition only // Since C++26
constexpr const ignore-type&
operator=(const auto &) const noexcept
{ return *this; }
};
inline constexpr ignore-type ignore;
template <class... T> tuple<V...> make_tuple(T&&...); // constexpr in C++14
template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14
template <class... T> tuple<T&...> tie(T&...) noexcept; // constexpr in C++14
template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14
// [tuple.apply], calling a function with a tuple of arguments:
template <class F, class Tuple>
constexpr decltype(auto) apply(F&& f, Tuple&& t) noexcept(see below); // C++17 noexcept since C++23
template <class T, class Tuple>
constexpr T make_from_tuple(Tuple&& t); // C++17
// 20.4.1.4, tuple helper classes:
template <class T> struct tuple_size; // undefined
template <class... T> struct tuple_size<tuple<T...>>;
template <class T>
inline constexpr size_t tuple_size_v = tuple_size<T>::value; // C++17
template <size_t I, class T> struct tuple_element; // undefined
template <size_t I, class... T> struct tuple_element<I, tuple<T...>>;
template <size_t I, class T>
using tuple_element_t = typename tuple_element <I, T>::type; // C++14
// 20.4.1.5, element access:
template <size_t I, class... T>
typename tuple_element<I, tuple<T...>>::type&
get(tuple<T...>&) noexcept; // constexpr in C++14
template <size_t I, class... T>
const typename tuple_element<I, tuple<T...>>::type&
get(const tuple<T...>&) noexcept; // constexpr in C++14
template <size_t I, class... T>
typename tuple_element<I, tuple<T...>>::type&&
get(tuple<T...>&&) noexcept; // constexpr in C++14
template <size_t I, class... T>
const typename tuple_element<I, tuple<T...>>::type&&
get(const tuple<T...>&&) noexcept; // constexpr in C++14
template <class T1, class... T>
constexpr T1& get(tuple<T...>&) noexcept; // C++14
template <class T1, class... T>
constexpr const T1& get(const tuple<T...>&) noexcept; // C++14
template <class T1, class... T>
constexpr T1&& get(tuple<T...>&&) noexcept; // C++14
template <class T1, class... T>
constexpr const T1&& get(const tuple<T...>&&) noexcept; // C++14
// 20.4.1.6, relational operators:
template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
template<class... T, class... U> bool operator<(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20
template<class... T, class... U> bool operator!=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20
template<class... T, class... U> bool operator>(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20
template<class... T, class... U> bool operator<=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20
template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14, removed in C++20
template<class... T, class... U>
constexpr common_comparison_category_t<synth-three-way-result<T, U>...>
operator<=>(const tuple<T...>&, const tuple<U...>&); // since C++20
template <class... Types, class Alloc>
struct uses_allocator<tuple<Types...>, Alloc>;
template <class... Types>
void
swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(noexcept(x.swap(y)));
template <class... Types>
constexpr void swap(const tuple<Types...>& x, const tuple<Types...>& y) noexcept(see-below); // C++23
} // std
*/
// clang-format on
#include <__compare/common_comparison_category.h>
#include <__compare/synth_three_way.h>
#include <__config>
#include <__functional/invoke.h>
#include <__fwd/array.h>
#include <__fwd/pair.h>
#include <__fwd/tuple.h>
#include <__memory/allocator_arg_t.h>
#include <__memory/uses_allocator.h>
#include <__tuple/find_index.h>
#include <__tuple/ignore.h>
#include <__tuple/make_tuple_types.h>
#include <__tuple/sfinae_helpers.h>
#include <__tuple/tuple_element.h>
#include <__tuple/tuple_indices.h>
#include <__tuple/tuple_like_ext.h>
#include <__tuple/tuple_size.h>
#include <__tuple/tuple_types.h>
#include <__type_traits/common_reference.h>
#include <__type_traits/common_type.h>
#include <__type_traits/conditional.h>
#include <__type_traits/conjunction.h>
#include <__type_traits/copy_cvref.h>
#include <__type_traits/disjunction.h>
#include <__type_traits/is_arithmetic.h>
#include <__type_traits/is_assignable.h>
#include <__type_traits/is_constructible.h>
#include <__type_traits/is_convertible.h>
#include <__type_traits/is_empty.h>
#include <__type_traits/is_final.h>
#include <__type_traits/is_implicitly_default_constructible.h>
#include <__type_traits/is_nothrow_assignable.h>
#include <__type_traits/is_nothrow_constructible.h>
#include <__type_traits/is_reference.h>
#include <__type_traits/is_same.h>
#include <__type_traits/is_swappable.h>
#include <__type_traits/is_trivially_relocatable.h>
#include <__type_traits/lazy.h>
#include <__type_traits/maybe_const.h>
#include <__type_traits/nat.h>
#include <__type_traits/negation.h>
#include <__type_traits/remove_cvref.h>
#include <__type_traits/remove_reference.h>
#include <__type_traits/unwrap_ref.h>
#include <__utility/forward.h>
#include <__utility/integer_sequence.h>
#include <__utility/move.h>
#include <__utility/piecewise_construct.h>
#include <__utility/swap.h>
#include <cstddef>
#include <version>
// standard-mandated includes
// [tuple.syn]
#include <compare>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
#ifndef _LIBCPP_CXX03_LANG
// __tuple_leaf
template <size_t _Ip, class _Hp, bool = is_empty<_Hp>::value && !__libcpp_is_final<_Hp>::value >
class __tuple_leaf;
template <size_t _Ip, class _Hp, bool _Ep>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y) noexcept(__is_nothrow_swappable_v<_Hp>) {
swap(__x.get(), __y.get());
}
template <size_t _Ip, class _Hp, bool _Ep>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
swap(const __tuple_leaf<_Ip, _Hp, _Ep>& __x,
const __tuple_leaf<_Ip, _Hp, _Ep>& __y) noexcept(__is_nothrow_swappable_v<const _Hp>) {
swap(__x.get(), __y.get());
}
template <size_t _Ip, class _Hp, bool>
class __tuple_leaf {
_Hp __value_;
template <class _Tp>
static _LIBCPP_HIDE_FROM_ABI constexpr bool __can_bind_reference() {
# if __has_keyword(__reference_binds_to_temporary)
return !__reference_binds_to_temporary(_Hp, _Tp);
# else
return true;
# endif
}
public:
_LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&) = delete;
_LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() noexcept(is_nothrow_default_constructible<_Hp>::value) : __value_() {
static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple");
}
template <class _Alloc>
_LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) : __value_() {
static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple");
}
template <class _Alloc>
_LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a)
: __value_(allocator_arg_t(), __a) {
static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple");
}
template <class _Alloc>
_LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : __value_(__a) {
static_assert(!is_reference<_Hp>::value, "Attempted to default construct a reference element in a tuple");
}
template <
class _Tp,
__enable_if_t<_And<_IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) noexcept(is_nothrow_constructible<_Hp, _Tp>::value)
: __value_(std::forward<_Tp>(__t)) {
static_assert(__can_bind_reference<_Tp&&>(),
"Attempted construction of reference element binds to a temporary whose lifetime has ended");
}
template <class _Tp, class _Alloc>
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t)
: __value_(std::forward<_Tp>(__t)) {
static_assert(__can_bind_reference<_Tp&&>(),
"Attempted construction of reference element binds to a temporary whose lifetime has ended");
}
template <class _Tp, class _Alloc>
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t)
: __value_(allocator_arg_t(), __a, std::forward<_Tp>(__t)) {
static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple");
}
template <class _Tp, class _Alloc>
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t)
: __value_(std::forward<_Tp>(__t), __a) {
static_assert(!is_reference<_Hp>::value, "Attempted to uses-allocator construct a reference element in a tuple");
}
_LIBCPP_HIDE_FROM_ABI __tuple_leaf(const __tuple_leaf& __t) = default;
_LIBCPP_HIDE_FROM_ABI __tuple_leaf(__tuple_leaf&& __t) = default;
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int
swap(__tuple_leaf& __t) noexcept(__is_nothrow_swappable_v<__tuple_leaf>) {
std::swap(*this, __t);
return 0;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __t) const
noexcept(__is_nothrow_swappable_v<const __tuple_leaf>) {
std::swap(*this, __t);
return 0;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return __value_; }
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT { return __value_; }
};
template <size_t _Ip, class _Hp>
class __tuple_leaf<_Ip, _Hp, true> : private _Hp {
public:
_LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&) = delete;
_LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf() noexcept(is_nothrow_default_constructible<_Hp>::value) {}
template <class _Alloc>
_LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 0>, const _Alloc&) {}
template <class _Alloc>
_LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a)
: _Hp(allocator_arg_t(), __a) {}
template <class _Alloc>
_LIBCPP_HIDE_FROM_ABI constexpr __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a) : _Hp(__a) {}
template <class _Tp,
__enable_if_t< _And< _IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value,
int> = 0>
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_leaf(_Tp&& __t) noexcept(is_nothrow_constructible<_Hp, _Tp>::value)
: _Hp(std::forward<_Tp>(__t)) {}
template <class _Tp, class _Alloc>
_LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t)
: _Hp(std::forward<_Tp>(__t)) {}
template <class _Tp, class _Alloc>
_LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t)
: _Hp(allocator_arg_t(), __a, std::forward<_Tp>(__t)) {}
template <class _Tp, class _Alloc>
_LIBCPP_HIDE_FROM_ABI constexpr explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t)
: _Hp(std::forward<_Tp>(__t), __a) {}
__tuple_leaf(__tuple_leaf const&) = default;
__tuple_leaf(__tuple_leaf&&) = default;
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int
swap(__tuple_leaf& __t) noexcept(__is_nothrow_swappable_v<__tuple_leaf>) {
std::swap(*this, __t);
return 0;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int swap(const __tuple_leaf& __rhs) const
noexcept(__is_nothrow_swappable_v<const __tuple_leaf>) {
std::swap(*this, __rhs);
return 0;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Hp& get() _NOEXCEPT { return static_cast<_Hp&>(*this); }
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Hp& get() const _NOEXCEPT {
return static_cast<const _Hp&>(*this);
}
};
template <class... _Tp>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __swallow(_Tp&&...) _NOEXCEPT {}
template <class _Tp>
struct __all_default_constructible;
template <class... _Tp>
struct __all_default_constructible<__tuple_types<_Tp...>> : __all<is_default_constructible<_Tp>::value...> {};
// __tuple_impl
template <class _Indx, class... _Tp>
struct __tuple_impl;
template <size_t... _Indx, class... _Tp>
struct _LIBCPP_DECLSPEC_EMPTY_BASES __tuple_impl<__tuple_indices<_Indx...>, _Tp...>
: public __tuple_leaf<_Indx, _Tp>... {
_LIBCPP_HIDE_FROM_ABI constexpr __tuple_impl() noexcept(
__all<is_nothrow_default_constructible<_Tp>::value...>::value) {}
template <size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl(
__tuple_indices<_Uf...>,
__tuple_types<_Tf...>,
__tuple_indices<_Ul...>,
__tuple_types<_Tl...>,
_Up&&... __u) noexcept(__all<is_nothrow_constructible<_Tf, _Up>::value...>::value &&
__all<is_nothrow_default_constructible<_Tl>::value...>::value)
: __tuple_leaf<_Uf, _Tf>(std::forward<_Up>(__u))..., __tuple_leaf<_Ul, _Tl>()... {}
template <class _Alloc, size_t... _Uf, class... _Tf, size_t... _Ul, class... _Tl, class... _Up>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl(
allocator_arg_t,
const _Alloc& __a,
__tuple_indices<_Uf...>,
__tuple_types<_Tf...>,
__tuple_indices<_Ul...>,
__tuple_types<_Tl...>,
_Up&&... __u)
: __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a, std::forward<_Up>(__u))...,
__tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)... {}
template <class _Tuple, __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(_Tuple&& __t) noexcept(
(__all<is_nothrow_constructible<
_Tp,
typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>::value...>::value))
: __tuple_leaf<_Indx, _Tp>(
std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>(
std::get<_Indx>(__t)))... {}
template <class _Alloc, class _Tuple, __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t)
: __tuple_leaf<_Indx, _Tp>(
__uses_alloc_ctor<_Tp,
_Alloc,
typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>(),
__a,
std::forward<typename tuple_element<_Indx, typename __make_tuple_types<_Tuple>::type>::type>(
std::get<_Indx>(__t)))... {}
__tuple_impl(const __tuple_impl&) = default;
__tuple_impl(__tuple_impl&&) = default;
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
swap(__tuple_impl& __t) noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) {
std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...);
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void swap(const __tuple_impl& __t) const
noexcept(__all<__is_nothrow_swappable_v<const _Tp>...>::value) {
std::__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t))...);
}
};
template <class _Dest, class _Source, size_t... _Np>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
__memberwise_copy_assign(_Dest& __dest, _Source const& __source, __tuple_indices<_Np...>) {
std::__swallow(((std::get<_Np>(__dest) = std::get<_Np>(__source)), void(), 0)...);
}
template <class _Dest, class _Source, class... _Up, size_t... _Np>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
__memberwise_forward_assign(_Dest& __dest, _Source&& __source, __tuple_types<_Up...>, __tuple_indices<_Np...>) {
std::__swallow(((std::get<_Np>(__dest) = std::forward<_Up>(std::get<_Np>(__source))), void(), 0)...);
}
template <class... _Tp>
class _LIBCPP_TEMPLATE_VIS tuple {
typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> _BaseT;
_BaseT __base_;
template <size_t _Jp, class... _Up>
friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT;
template <size_t _Jp, class... _Up>
friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type&
get(const tuple<_Up...>&) _NOEXCEPT;
template <size_t _Jp, class... _Up>
friend _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Jp, tuple<_Up...> >::type&&
get(tuple<_Up...>&&) _NOEXCEPT;
template <size_t _Jp, class... _Up>
friend _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Jp, tuple<_Up...> >::type&&
get(const tuple<_Up...>&&) _NOEXCEPT;
public:
using __trivially_relocatable = __conditional_t<_And<__libcpp_is_trivially_relocatable<_Tp>...>::value, tuple, void>;
// [tuple.cnstr]
// tuple() constructors (including allocator_arg_t variants)
template <template <class...> class _IsImpDefault = __is_implicitly_default_constructible,
template <class...> class _IsDefault = is_default_constructible,
__enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value)
tuple() noexcept(_And<is_nothrow_default_constructible<_Tp>...>::value) {}
template <class _Alloc,
template <class...> class _IsImpDefault = __is_implicitly_default_constructible,
template <class...> class _IsDefault = is_default_constructible,
__enable_if_t< _And< _IsDefault<_Tp>... >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, _IsImpDefault<_Tp>...> >::value)
tuple(allocator_arg_t, _Alloc const& __a)
: __base_(allocator_arg_t(),
__a,
__tuple_indices<>(),
__tuple_types<>(),
typename __make_tuple_indices<sizeof...(_Tp), 0>::type(),
__tuple_types<_Tp...>()) {}
// tuple(const T&...) constructors (including allocator_arg_t variants)
template <template <class...> class _And = _And,
__enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value)
tuple(const _Tp&... __t) noexcept(_And<is_nothrow_copy_constructible<_Tp>...>::value)
: __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
typename __make_tuple_indices<0>::type(),
typename __make_tuple_types<tuple, 0>::type(),
__t...) {}
template <class _Alloc,
template <class...> class _And = _And,
__enable_if_t< _And< _BoolConstant<sizeof...(_Tp) >= 1>, is_copy_constructible<_Tp>... >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<const _Tp&, _Tp>...> >::value)
tuple(allocator_arg_t, const _Alloc& __a, const _Tp&... __t)
: __base_(allocator_arg_t(),
__a,
typename __make_tuple_indices<sizeof...(_Tp)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
typename __make_tuple_indices<0>::type(),
typename __make_tuple_types<tuple, 0>::type(),
__t...) {}
// tuple(U&& ...) constructors (including allocator_arg_t variants)
template <class... _Up>
struct _IsThisTuple : false_type {};
template <class _Up>
struct _IsThisTuple<_Up> : is_same<__remove_cvref_t<_Up>, tuple> {};
template <class... _Up>
struct _EnableUTypesCtor
: _And< _BoolConstant<sizeof...(_Tp) >= 1>,
_Not<_IsThisTuple<_Up...> >, // extension to allow mis-behaved user constructors
is_constructible<_Tp, _Up>... > {};
template <class... _Up,
__enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value,
int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value)
tuple(_Up&&... __u) noexcept(_And<is_nothrow_constructible<_Tp, _Up>...>::value)
: __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
std::forward<_Up>(__u)...) {}
template <class _Alloc,
class... _Up,
__enable_if_t< _And< _BoolConstant<sizeof...(_Up) == sizeof...(_Tp)>, _EnableUTypesCtor<_Up...> >::value,
int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value)
tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u)
: __base_(allocator_arg_t(),
__a,
typename __make_tuple_indices<sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
std::forward<_Up>(__u)...) {}
// Copy and move constructors (including the allocator_arg_t variants)
tuple(const tuple&) = default;
tuple(tuple&&) = default;
template <class _Alloc,
template <class...> class _And = _And,
__enable_if_t< _And<is_copy_constructible<_Tp>...>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, const tuple& __t)
: __base_(allocator_arg_t(), __alloc, __t) {}
template <class _Alloc,
template <class...> class _And = _And,
__enable_if_t< _And<is_move_constructible<_Tp>...>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc& __alloc, tuple&& __t)
: __base_(allocator_arg_t(), __alloc, std::move(__t)) {}
// tuple(const tuple<U...>&) constructors (including allocator_arg_t variants)
template <class _OtherTuple, class _DecayedOtherTuple = __remove_cvref_t<_OtherTuple>, class = void>
struct _EnableCtorFromUTypesTuple : false_type {};
template <class _OtherTuple, class... _Up>
struct _EnableCtorFromUTypesTuple<
_OtherTuple,
tuple<_Up...>,
// the length of the packs needs to checked first otherwise the 2 packs cannot be expanded simultaneously below
__enable_if_t<sizeof...(_Up) == sizeof...(_Tp)>>
: _And<
// the two conditions below are not in spec. The purpose is to disable the UTypes Ctor when copy/move Ctor
// can work. Otherwise, is_constructible can trigger hard error in those cases
// https://godbolt.org/z/M94cGdKcE
_Not<is_same<_OtherTuple, const tuple&> >,
_Not<is_same<_OtherTuple, tuple&&> >,
is_constructible<_Tp, __copy_cvref_t<_OtherTuple, _Up> >...,
_Lazy<_Or,
_BoolConstant<sizeof...(_Tp) != 1>,
// _Tp and _Up are 1-element packs - the pack expansions look
// weird to avoid tripping up the type traits in degenerate cases
_Lazy<_And,
_Not<is_same<_Tp, _Up> >...,
_Not<is_convertible<_OtherTuple, _Tp> >...,
_Not<is_constructible<_Tp, _OtherTuple> >... > > > {};
template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value)
tuple(const tuple<_Up...>& __t) noexcept(_And<is_nothrow_constructible<_Tp, const _Up&>...>::value)
: __base_(__t) {}
template <class... _Up,
class _Alloc,
__enable_if_t< _And< _EnableCtorFromUTypesTuple<const tuple<_Up...>&> >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<const _Up&, _Tp>...> >::value)
tuple(allocator_arg_t, const _Alloc& __a, const tuple<_Up...>& __t)
: __base_(allocator_arg_t(), __a, __t) {}
# if _LIBCPP_STD_VER >= 23
// tuple(tuple<U...>&) constructors (including allocator_arg_t variants)
template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr>
_LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value) tuple(tuple<_Up...>& __t)
: __base_(__t) {}
template <class _Alloc, class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<tuple<_Up...>&>::value>* = nullptr>
_LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<_Up&, _Tp>...>::value)
tuple(allocator_arg_t, const _Alloc& __alloc, tuple<_Up...>& __t)
: __base_(allocator_arg_t(), __alloc, __t) {}
# endif // _LIBCPP_STD_VER >= 23
// tuple(tuple<U...>&&) constructors (including allocator_arg_t variants)
template <class... _Up, __enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value)
tuple(tuple<_Up...>&& __t) noexcept(_And<is_nothrow_constructible<_Tp, _Up>...>::value)
: __base_(std::move(__t)) {}
template <class _Alloc,
class... _Up,
__enable_if_t< _And< _EnableCtorFromUTypesTuple<tuple<_Up...>&&> >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_Lazy<_And, is_convertible<_Up, _Tp>...> >::value)
tuple(allocator_arg_t, const _Alloc& __a, tuple<_Up...>&& __t)
: __base_(allocator_arg_t(), __a, std::move(__t)) {}
# if _LIBCPP_STD_VER >= 23
// tuple(const tuple<U...>&&) constructors (including allocator_arg_t variants)
template <class... _Up, enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr>
_LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value)
tuple(const tuple<_Up...>&& __t)
: __base_(std::move(__t)) {}
template <class _Alloc,
class... _Up,
enable_if_t< _EnableCtorFromUTypesTuple<const tuple<_Up...>&&>::value>* = nullptr>
_LIBCPP_HIDE_FROM_ABI constexpr explicit(!_Lazy<_And, is_convertible<const _Up&&, _Tp>...>::value)
tuple(allocator_arg_t, const _Alloc& __alloc, const tuple<_Up...>&& __t)
: __base_(allocator_arg_t(), __alloc, std::move(__t)) {}
# endif // _LIBCPP_STD_VER >= 23
// tuple(const pair<U1, U2>&) constructors (including allocator_arg_t variants)
template <template <class...> class _Pred,
class _Pair,
class _DecayedPair = __remove_cvref_t<_Pair>,
class _Tuple = tuple>
struct _CtorPredicateFromPair : false_type {};
template <template <class...> class _Pred, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2>
struct _CtorPredicateFromPair<_Pred, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> >
: _And< _Pred<_Tp1, __copy_cvref_t<_Pair, _Up1> >, _Pred<_Tp2, __copy_cvref_t<_Pair, _Up2> > > {};
template <class _Pair>
struct _EnableCtorFromPair : _CtorPredicateFromPair<is_constructible, _Pair> {};
template <class _Pair>
struct _NothrowConstructibleFromPair : _CtorPredicateFromPair<is_nothrow_constructible, _Pair> {};
template <class _Pair, class _DecayedPair = __remove_cvref_t<_Pair>, class _Tuple = tuple>
struct _BothImplicitlyConvertible : false_type {};
template <class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2>
struct _BothImplicitlyConvertible<_Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> >
: _And< is_convertible<__copy_cvref_t<_Pair, _Up1>, _Tp1>, is_convertible<__copy_cvref_t<_Pair, _Up2>, _Tp2> > {};
template <class _Up1,
class _Up2,
template <class...> class _And = _And,
__enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value)
tuple(const pair<_Up1, _Up2>& __p) noexcept(_NothrowConstructibleFromPair<const pair<_Up1, _Up2>&>::value)
: __base_(__p) {}
template <class _Alloc,
class _Up1,
class _Up2,
template <class...> class _And = _And,
__enable_if_t< _And< _EnableCtorFromPair<const pair<_Up1, _Up2>&> >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_BothImplicitlyConvertible<const pair<_Up1, _Up2>&> >::value)
tuple(allocator_arg_t, const _Alloc& __a, const pair<_Up1, _Up2>& __p)
: __base_(allocator_arg_t(), __a, __p) {}
# if _LIBCPP_STD_VER >= 23
// tuple(pair<U1, U2>&) constructors (including allocator_arg_t variants)
template <class _U1, class _U2, enable_if_t< _EnableCtorFromPair<pair<_U1, _U2>&>::value>* = nullptr>
_LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value)
tuple(pair<_U1, _U2>& __p)
: __base_(__p) {}
template <class _Alloc,
class _U1,
class _U2,
enable_if_t< _EnableCtorFromPair<std::pair<_U1, _U2>&>::value>* = nullptr>
_LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<pair<_U1, _U2>&>::value)
tuple(allocator_arg_t, const _Alloc& __alloc, pair<_U1, _U2>& __p)
: __base_(allocator_arg_t(), __alloc, __p) {}
# endif
// tuple(pair<U1, U2>&&) constructors (including allocator_arg_t variants)
template <class _Up1,
class _Up2,
template <class...> class _And = _And,
__enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX14 explicit(_Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value)
tuple(pair<_Up1, _Up2>&& __p) noexcept(_NothrowConstructibleFromPair<pair<_Up1, _Up2>&&>::value)
: __base_(std::move(__p)) {}
template <class _Alloc,
class _Up1,
class _Up2,
template <class...> class _And = _And,
__enable_if_t< _And< _EnableCtorFromPair<pair<_Up1, _Up2>&&> >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX20 explicit(_Not<_BothImplicitlyConvertible<pair<_Up1, _Up2>&&> >::value)
tuple(allocator_arg_t, const _Alloc& __a, pair<_Up1, _Up2>&& __p)
: __base_(allocator_arg_t(), __a, std::move(__p)) {}
# if _LIBCPP_STD_VER >= 23
// tuple(const pair<U1, U2>&&) constructors (including allocator_arg_t variants)
template <class _U1, class _U2, enable_if_t< _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr>
_LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value)
tuple(const pair<_U1, _U2>&& __p)
: __base_(std::move(__p)) {}
template <class _Alloc,
class _U1,
class _U2,
enable_if_t< _EnableCtorFromPair<const pair<_U1, _U2>&&>::value>* = nullptr>
_LIBCPP_HIDE_FROM_ABI constexpr explicit(!_BothImplicitlyConvertible<const pair<_U1, _U2>&&>::value)
tuple(allocator_arg_t, const _Alloc& __alloc, const pair<_U1, _U2>&& __p)
: __base_(allocator_arg_t(), __alloc, std::move(__p)) {}
# endif // _LIBCPP_STD_VER >= 23
// [tuple.assign]
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
operator=(_If<_And<is_copy_assignable<_Tp>...>::value, tuple, __nat> const& __tuple)
noexcept(_And<is_nothrow_copy_assignable<_Tp>...>::value) {
std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type());
return *this;
}
# if _LIBCPP_STD_VER >= 23
_LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple const& __tuple) const
requires(_And<is_copy_assignable<const _Tp>...>::value)
{
std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type());
return *this;
}
_LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple&& __tuple) const
requires(_And<is_assignable<const _Tp&, _Tp>...>::value)
{
std::__memberwise_forward_assign(
*this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
return *this;
}
# endif // _LIBCPP_STD_VER >= 23
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple&
operator=(_If<_And<is_move_assignable<_Tp>...>::value, tuple, __nat>&& __tuple)
noexcept(_And<is_nothrow_move_assignable<_Tp>...>::value) {
std::__memberwise_forward_assign(
*this, std::move(__tuple), __tuple_types<_Tp...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
return *this;
}
template <
class... _Up,
__enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up const&>... >::value,
int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(tuple<_Up...> const& __tuple)
noexcept(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) {
std::__memberwise_copy_assign(*this, __tuple, typename __make_tuple_indices<sizeof...(_Tp)>::type());
return *this;
}
template <class... _Up,
__enable_if_t< _And< _BoolConstant<sizeof...(_Tp) == sizeof...(_Up)>, is_assignable<_Tp&, _Up>... >::value,
int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(tuple<_Up...>&& __tuple)
noexcept(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) {
std::__memberwise_forward_assign(
*this, std::move(__tuple), __tuple_types<_Up...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
return *this;
}
# if _LIBCPP_STD_VER >= 23
template <class... _UTypes,
enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>,
is_assignable<const _Tp&, const _UTypes&>...>::value>* = nullptr>
_LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const tuple<_UTypes...>& __u) const {
std::__memberwise_copy_assign(*this, __u, typename __make_tuple_indices<sizeof...(_Tp)>::type());
return *this;
}
template <class... _UTypes,
enable_if_t< _And<_BoolConstant<sizeof...(_Tp) == sizeof...(_UTypes)>,
is_assignable<const _Tp&, _UTypes>...>::value>* = nullptr>
_LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(tuple<_UTypes...>&& __u) const {
std::__memberwise_forward_assign(
*this, __u, __tuple_types<_UTypes...>(), typename __make_tuple_indices<sizeof...(_Tp)>::type());
return *this;
}
# endif // _LIBCPP_STD_VER >= 23
template <template <class...> class _Pred,
bool _Const,
class _Pair,
class _DecayedPair = __remove_cvref_t<_Pair>,
class _Tuple = tuple>
struct _AssignPredicateFromPair : false_type {};
template <template <class...> class _Pred, bool _Const, class _Pair, class _Up1, class _Up2, class _Tp1, class _Tp2>
struct _AssignPredicateFromPair<_Pred, _Const, _Pair, pair<_Up1, _Up2>, tuple<_Tp1, _Tp2> >
: _And<_Pred<__maybe_const<_Const, _Tp1>&, __copy_cvref_t<_Pair, _Up1> >,
_Pred<__maybe_const<_Const, _Tp2>&, __copy_cvref_t<_Pair, _Up2> > > {};
template <bool _Const, class _Pair>
struct _EnableAssignFromPair : _AssignPredicateFromPair<is_assignable, _Const, _Pair> {};
template <bool _Const, class _Pair>
struct _NothrowAssignFromPair : _AssignPredicateFromPair<is_nothrow_assignable, _Const, _Pair> {};
# if _LIBCPP_STD_VER >= 23
template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, const pair<_U1, _U2>&>::value>* = nullptr>
_LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(const pair<_U1, _U2>& __pair) const
noexcept(_NothrowAssignFromPair<true, const pair<_U1, _U2>&>::value) {
std::get<0>(*this) = __pair.first;
std::get<1>(*this) = __pair.second;
return *this;
}
template <class _U1, class _U2, enable_if_t< _EnableAssignFromPair<true, pair<_U1, _U2>&&>::value>* = nullptr>
_LIBCPP_HIDE_FROM_ABI constexpr const tuple& operator=(pair<_U1, _U2>&& __pair) const
noexcept(_NothrowAssignFromPair<true, pair<_U1, _U2>&&>::value) {
std::get<0>(*this) = std::move(__pair.first);
std::get<1>(*this) = std::move(__pair.second);
return *this;
}
# endif // _LIBCPP_STD_VER >= 23
template <class _Up1,
class _Up2,
__enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2> const&>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(pair<_Up1, _Up2> const& __pair)
noexcept(_NothrowAssignFromPair<false, pair<_Up1, _Up2> const&>::value) {
std::get<0>(*this) = __pair.first;
std::get<1>(*this) = __pair.second;
return *this;
}
template <class _Up1, class _Up2, __enable_if_t< _EnableAssignFromPair<false, pair<_Up1, _Up2>&&>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(pair<_Up1, _Up2>&& __pair)
noexcept(_NothrowAssignFromPair<false, pair<_Up1, _Up2>&&>::value) {
std::get<0>(*this) = std::forward<_Up1>(__pair.first);
std::get<1>(*this) = std::forward<_Up2>(__pair.second);
return *this;
}
// EXTENSION
template <
class _Up,
size_t _Np,
__enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up const&>... >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(array<_Up, _Np> const& __array)
noexcept(_And<is_nothrow_assignable<_Tp&, _Up const&>...>::value) {
std::__memberwise_copy_assign(*this, __array, typename __make_tuple_indices<sizeof...(_Tp)>::type());
return *this;
}
// EXTENSION
template <class _Up,
size_t _Np,
class = void,
__enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up>... >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple& operator=(array<_Up, _Np>&& __array)
noexcept(_And<is_nothrow_assignable<_Tp&, _Up>...>::value) {
std::__memberwise_forward_assign(
*this,
std::move(__array),
__tuple_types<_If<true, _Up, _Tp>...>(),
typename __make_tuple_indices<sizeof...(_Tp)>::type());
return *this;
}
// [tuple.swap]
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple& __t)
noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) {
__base_.swap(__t.__base_);
}
# if _LIBCPP_STD_VER >= 23
_LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple& __t) const
noexcept(__all<is_nothrow_swappable_v<const _Tp&>...>::value) {
__base_.swap(__t.__base_);
}
# endif // _LIBCPP_STD_VER >= 23
};
template <>
class _LIBCPP_TEMPLATE_VIS tuple<> {
public:
constexpr tuple() _NOEXCEPT = default;
template <class _Alloc>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {}
template <class _Alloc>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {}
template <class _Up>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(array<_Up, 0>) _NOEXCEPT {}
template <class _Alloc, class _Up>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple&) _NOEXCEPT {}
# if _LIBCPP_STD_VER >= 23
_LIBCPP_HIDE_FROM_ABI constexpr void swap(const tuple&) const noexcept {}
# endif
};
# if _LIBCPP_STD_VER >= 23
template <class... _TTypes, class... _UTypes, template <class> class _TQual, template <class> class _UQual>
requires requires { typename tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>; }
struct basic_common_reference<tuple<_TTypes...>, tuple<_UTypes...>, _TQual, _UQual> {
using type = tuple<common_reference_t<_TQual<_TTypes>, _UQual<_UTypes>>...>;
};
template <class... _TTypes, class... _UTypes>
requires requires { typename tuple<common_type_t<_TTypes, _UTypes>...>; }
struct common_type<tuple<_TTypes...>, tuple<_UTypes...>> {
using type = tuple<common_type_t<_TTypes, _UTypes>...>;
};
# endif // _LIBCPP_STD_VER >= 23
# if _LIBCPP_STD_VER >= 17
template <class... _Tp>
tuple(_Tp...) -> tuple<_Tp...>;
template <class _Tp1, class _Tp2>
tuple(pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>;
template <class _Alloc, class... _Tp>
tuple(allocator_arg_t, _Alloc, _Tp...) -> tuple<_Tp...>;
template <class _Alloc, class _Tp1, class _Tp2>
tuple(allocator_arg_t, _Alloc, pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>;
template <class _Alloc, class... _Tp>
tuple(allocator_arg_t, _Alloc, tuple<_Tp...>) -> tuple<_Tp...>;
# endif
template <class... _Tp, __enable_if_t<__all<__is_swappable_v<_Tp>...>::value, int> = 0>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u)
noexcept(__all<__is_nothrow_swappable_v<_Tp>...>::value) {
__t.swap(__u);
}
# if _LIBCPP_STD_VER >= 23
template <class... _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<__all<is_swappable_v<const _Tp>...>::value, void>
swap(const tuple<_Tp...>& __lhs,
const tuple<_Tp...>& __rhs) noexcept(__all<is_nothrow_swappable_v<const _Tp>...>::value) {
__lhs.swap(__rhs);
}
# endif
// get
template <size_t _Ip, class... _Tp>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&
get(tuple<_Tp...>& __t) _NOEXCEPT {
typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type;
return static_cast<__tuple_leaf<_Ip, type>&>(__t.__base_).get();
}
template <size_t _Ip, class... _Tp>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
get(const tuple<_Tp...>& __t) _NOEXCEPT {
typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type;
return static_cast<const __tuple_leaf<_Ip, type>&>(__t.__base_).get();
}
template <size_t _Ip, class... _Tp>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
get(tuple<_Tp...>&& __t) _NOEXCEPT {
typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type;
return static_cast<type&&>(static_cast<__tuple_leaf<_Ip, type>&&>(__t.__base_).get());
}
template <size_t _Ip, class... _Tp>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
get(const tuple<_Tp...>&& __t) _NOEXCEPT {
typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, tuple<_Tp...> >::type type;
return static_cast<const type&&>(static_cast<const __tuple_leaf<_Ip, type>&&>(__t.__base_).get());
}
# if _LIBCPP_STD_VER >= 14
template <class _T1, class... _Args>
inline _LIBCPP_HIDE_FROM_ABI constexpr _T1& get(tuple<_Args...>& __tup) noexcept {
return std::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup);
}
template <class _T1, class... _Args>
inline _LIBCPP_HIDE_FROM_ABI constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept {
return std::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup);
}
template <class _T1, class... _Args>
inline _LIBCPP_HIDE_FROM_ABI constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept {
return std::get<__find_exactly_one_t<_T1, _Args...>::value>(std::move(__tup));
}
template <class _T1, class... _Args>
inline _LIBCPP_HIDE_FROM_ABI constexpr _T1 const&& get(tuple<_Args...> const&& __tup) noexcept {
return std::get<__find_exactly_one_t<_T1, _Args...>::value>(std::move(__tup));
}
# endif
// tie
template <class... _Tp>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&...> tie(_Tp&... __t) _NOEXCEPT {
return tuple<_Tp&...>(__t...);
}
template <class... _Tp>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<typename __unwrap_ref_decay<_Tp>::type...>
make_tuple(_Tp&&... __t) {
return tuple<typename __unwrap_ref_decay<_Tp>::type...>(std::forward<_Tp>(__t)...);
}
template <class... _Tp>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&&...> forward_as_tuple(_Tp&&... __t) _NOEXCEPT {
return tuple<_Tp&&...>(std::forward<_Tp>(__t)...);
}
template <size_t _Ip>
struct __tuple_equal {
template <class _Tp, class _Up>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __x, const _Up& __y) {
return __tuple_equal<_Ip - 1>()(__x, __y) && std::get<_Ip - 1>(__x) == std::get<_Ip - 1>(__y);
}
};
template <>
struct __tuple_equal<0> {
template <class _Tp, class _Up>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp&, const _Up&) {
return true;
}
};
template <class... _Tp, class... _Up>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes");
return __tuple_equal<sizeof...(_Tp)>()(__x, __y);
}
# if _LIBCPP_STD_VER >= 20
// operator<=>
template <class... _Tp, class... _Up, size_t... _Is>
_LIBCPP_HIDE_FROM_ABI constexpr auto
__tuple_compare_three_way(const tuple<_Tp...>& __x, const tuple<_Up...>& __y, index_sequence<_Is...>) {
common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...> __result = strong_ordering::equal;
static_cast<void>(
((__result = std::__synth_three_way(std::get<_Is>(__x), std::get<_Is>(__y)), __result != 0) || ...));
return __result;
}
template <class... _Tp, class... _Up>
requires(sizeof...(_Tp) == sizeof...(_Up))
_LIBCPP_HIDE_FROM_ABI constexpr common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...>
operator<=>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
return std::__tuple_compare_three_way(__x, __y, index_sequence_for<_Tp...>{});
}
# else // _LIBCPP_STD_VER >= 20
template <class... _Tp, class... _Up>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
return !(__x == __y);
}
template <size_t _Ip>
struct __tuple_less {
template <class _Tp, class _Up>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __x, const _Up& __y) {
const size_t __idx = tuple_size<_Tp>::value - _Ip;
if (std::get<__idx>(__x) < std::get<__idx>(__y))
return true;
if (std::get<__idx>(__y) < std::get<__idx>(__x))
return false;
return __tuple_less<_Ip - 1>()(__x, __y);
}
};
template <>
struct __tuple_less<0> {
template <class _Tp, class _Up>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp&, const _Up&) {
return false;
}
};
template <class... _Tp, class... _Up>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
static_assert(sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes");
return __tuple_less<sizeof...(_Tp)>()(__x, __y);
}
template <class... _Tp, class... _Up>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
return __y < __x;
}
template <class... _Tp, class... _Up>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
return !(__x < __y);
}
template <class... _Tp, class... _Up>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y) {
return !(__y < __x);
}
# endif // _LIBCPP_STD_VER >= 20
// tuple_cat
template <class _Tp, class _Up>
struct __tuple_cat_type;
template <class... _Ttypes, class... _Utypes>
struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> > {
typedef _LIBCPP_NODEBUG tuple<_Ttypes..., _Utypes...> type;
};
template <class _ResultTuple, bool _Is_Tuple0TupleLike, class... _Tuples>
struct __tuple_cat_return_1 {};
template <class... _Types, class _Tuple0>
struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0> {
using type _LIBCPP_NODEBUG =
typename __tuple_cat_type< tuple<_Types...>,
typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type;
};
template <class... _Types, class _Tuple0, class _Tuple1, class... _Tuples>
struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...>
: public __tuple_cat_return_1<
typename __tuple_cat_type< tuple<_Types...>,
typename __make_tuple_types<__remove_cvref_t<_Tuple0> >::type >::type,
__tuple_like_ext<__libcpp_remove_reference_t<_Tuple1> >::value,
_Tuple1,
_Tuples...> {};
template <class... _Tuples>
struct __tuple_cat_return;
template <class _Tuple0, class... _Tuples>
struct __tuple_cat_return<_Tuple0, _Tuples...>
: public __tuple_cat_return_1<tuple<>,
__tuple_like_ext<__libcpp_remove_reference_t<_Tuple0> >::value,
_Tuple0,
_Tuples...> {};
template <>
struct __tuple_cat_return<> {
typedef _LIBCPP_NODEBUG tuple<> type;
};
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<> tuple_cat() { return tuple<>(); }
template <class _Rp, class _Indices, class _Tuple0, class... _Tuples>
struct __tuple_cat_return_ref_imp;
template <class... _Types, size_t... _I0, class _Tuple0>
struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0> {
typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0;
typedef tuple<_Types..., __copy_cvref_t<_Tuple0, typename tuple_element<_I0, _T0>::type>&&...> type;
};
template <class... _Types, size_t... _I0, class _Tuple0, class _Tuple1, class... _Tuples>
struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0, _Tuple1, _Tuples...>
: public __tuple_cat_return_ref_imp<
tuple<_Types...,
__copy_cvref_t<_Tuple0, typename tuple_element<_I0, __libcpp_remove_reference_t<_Tuple0>>::type>&&...>,
typename __make_tuple_indices<tuple_size<__libcpp_remove_reference_t<_Tuple1> >::value>::type,
_Tuple1,
_Tuples...> {};
template <class _Tuple0, class... _Tuples>
struct __tuple_cat_return_ref
: public __tuple_cat_return_ref_imp<
tuple<>,
typename __make_tuple_indices< tuple_size<__libcpp_remove_reference_t<_Tuple0> >::value >::type,
_Tuple0,
_Tuples...> {};
template <class _Types, class _I0, class _J0>
struct __tuple_cat;
template <class... _Types, size_t... _I0, size_t... _J0>
struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> > {
template <class _Tuple0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type
operator()(tuple<_Types...> __t, _Tuple0&& __t0) {
(void)__t; // avoid unused parameter warning on GCC when _I0 is empty
return std::forward_as_tuple(
std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...);
}
template <class _Tuple0, class _Tuple1, class... _Tuples>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type
operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&&... __tpls) {
(void)__t; // avoid unused parameter warning on GCC when _I0 is empty
typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0;
typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple1> _T1;
return __tuple_cat<tuple<_Types..., __copy_cvref_t<_Tuple0, typename tuple_element<_J0, _T0>::type>&&...>,
typename __make_tuple_indices<sizeof...(_Types) + tuple_size<_T0>::value>::type,
typename __make_tuple_indices<tuple_size<_T1>::value>::type>()(
std::forward_as_tuple(
std::forward<_Types>(std::get<_I0>(__t))..., std::get<_J0>(std::forward<_Tuple0>(__t0))...),
std::forward<_Tuple1>(__t1),
std::forward<_Tuples>(__tpls)...);
}
};
template <class _Tuple0, class... _Tuples>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename __tuple_cat_return<_Tuple0, _Tuples...>::type
tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) {
typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tuple0> _T0;
return __tuple_cat<tuple<>, __tuple_indices<>, typename __make_tuple_indices<tuple_size<_T0>::value>::type>()(
tuple<>(), std::forward<_Tuple0>(__t0), std::forward<_Tuples>(__tpls)...);
}
template <class... _Tp, class _Alloc>
struct _LIBCPP_TEMPLATE_VIS uses_allocator<tuple<_Tp...>, _Alloc> : true_type {};
# if _LIBCPP_STD_VER >= 17
# define _LIBCPP_NOEXCEPT_RETURN(...) \
noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; }
// The _LIBCPP_NOEXCEPT_RETURN macro breaks formatting.
// clang-format off
template <class _Fn, class _Tuple, size_t... _Id>
inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto)
__apply_tuple_impl(_Fn&& __f, _Tuple&& __t, __tuple_indices<_Id...>)
_LIBCPP_NOEXCEPT_RETURN(std::__invoke(std::forward<_Fn>(__f), std::get<_Id>(std::forward<_Tuple>(__t))...))
template <class _Fn, class _Tuple>
inline _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) apply(_Fn&& __f, _Tuple&& __t)
_LIBCPP_NOEXCEPT_RETURN(std::__apply_tuple_impl(
std::forward<_Fn>(__f),
std::forward<_Tuple>(__t),
typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}))
#if _LIBCPP_STD_VER >= 20
template <class _Tp, class _Tuple, size_t... _Idx>
inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>)
noexcept(noexcept(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...)))
requires is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...> {
return _Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...);
}
#else
template <class _Tp, class _Tuple, size_t... _Idx>
inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>,
enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::forward<_Tuple>(__t)))...>> * = nullptr)
_LIBCPP_NOEXCEPT_RETURN(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...))
#endif // _LIBCPP_STD_VER >= 20
template <class _Tp, class _Tuple,
class _Seq = typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type, class = void>
inline constexpr bool __can_make_from_tuple = false;
template <class _Tp, class _Tuple, size_t... _Idx>
inline constexpr bool __can_make_from_tuple<_Tp, _Tuple, __tuple_indices<_Idx...>,
enable_if_t<is_constructible_v<_Tp, decltype(std::get<_Idx>(std::declval<_Tuple>()))...>>> = true;
// Based on LWG3528(https://wg21.link/LWG3528) and http://eel.is/c++draft/description#structure.requirements-9,
// the standard allows to impose requirements, we constraint std::make_from_tuple to make std::make_from_tuple
// SFINAE friendly and also avoid worse diagnostic messages. We still keep the constraints of std::__make_from_tuple_impl
// so that std::__make_from_tuple_impl will have the same advantages when used alone.
#if _LIBCPP_STD_VER >= 20
template <class _Tp, class _Tuple>
requires __can_make_from_tuple<_Tp, _Tuple> // strengthen
#else
template <class _Tp, class _Tuple, class = enable_if_t<__can_make_from_tuple<_Tp, _Tuple>>> // strengthen
#endif // _LIBCPP_STD_VER >= 20
inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp make_from_tuple(_Tuple&& __t)
_LIBCPP_NOEXCEPT_RETURN(std::__make_from_tuple_impl<_Tp>(
std::forward<_Tuple>(__t), typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{}))
# undef _LIBCPP_NOEXCEPT_RETURN
# endif // _LIBCPP_STD_VER >= 17
#endif // !defined(_LIBCPP_CXX03_LANG)
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
// clang-format on
#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
# include <exception>
# include <iosfwd>
# include <new>
# include <type_traits>
# include <typeinfo>
# include <utility>
#endif
#endif // _LIBCPP_TUPLE
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