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Diffstat (limited to 'third_party/libcxx/include/c++/v1/tuple')
| -rw-r--r-- | third_party/libcxx/include/c++/v1/tuple | 1477 |
1 files changed, 1477 insertions, 0 deletions
diff --git a/third_party/libcxx/include/c++/v1/tuple b/third_party/libcxx/include/c++/v1/tuple new file mode 100644 index 0000000..e02e45f --- /dev/null +++ b/third_party/libcxx/include/c++/v1/tuple @@ -0,0 +1,1477 @@ +// -*- 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<tuple-like UTuple> + friend constexpr bool operator==(const tuple& t, const UTuple& u); // C++23 + template<tuple-like UTuple> + friend constexpr auto operator<=>(const tuple& t, const UTuple& u); // 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 + +#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS) +# include <__cxx03/__config> +#else +# include <__compare/common_comparison_category.h> +# include <__compare/ordering.h> +# include <__compare/synth_three_way.h> +# include <__concepts/boolean_testable.h> +# include <__config> +# include <__cstddef/size_t.h> +# include <__fwd/array.h> +# include <__fwd/get.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/tuple_element.h> +# include <__tuple/tuple_like.h> +# include <__tuple/tuple_size.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/enable_if.h> +# include <__type_traits/invoke.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/reference_constructs_from_temporary.h> +# include <__type_traits/remove_cv.h> +# include <__type_traits/remove_cvref.h> +# include <__type_traits/remove_reference.h> +# include <__type_traits/type_list.h> +# include <__type_traits/unwrap_ref.h> +# include <__utility/declval.h> +# include <__utility/forward.h> +# include <__utility/integer_sequence.h> +# include <__utility/move.h> +# include <__utility/swap.h> +# 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 + +template <size_t _Ip, class _Tp, class _Up> +_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool __tuple_compare_equal(const _Tp& __x, const _Up& __y) { + if constexpr (_Ip == 0) + return true; + else + return std::__tuple_compare_equal<_Ip - 1>(__x, __y) && std::get<_Ip - 1>(__x) == std::get<_Ip - 1>(__y); +} + +# if _LIBCPP_STD_VER >= 26 +template <class _Tp, class _Up, class _IndexSeq = make_index_sequence<tuple_size_v<_Tp>>> +inline constexpr bool __can_tuple_compare_equal = false; + +// TODO(LLVM 23): Remove `tuple_size_v<_Tp> == tuple_size_v<_Up>` here once once LLVM-20 support ends +// because the resolution of CWG2369 landed in LLVM-21. +template <class _Tp, class _Up, size_t... _Is> + requires(tuple_size_v<_Tp> == tuple_size_v<_Up>) +inline constexpr bool __can_tuple_compare_equal<_Tp, _Up, index_sequence<_Is...>> = + __all<requires(const tuple_element_t<_Is, _Tp>& __t, const tuple_element_t<_Is, _Up>& __u) { + { __t == __u } -> __boolean_testable; + }...>::value; +# endif // _LIBCPP_STD_VER >= 26 + +# if _LIBCPP_STD_VER >= 20 +template <class _Ret, class _Tp, class _Up, size_t... _Is> +_LIBCPP_HIDE_FROM_ABI constexpr _Ret __tuple_compare_three_way(const _Tp& __x, const _Up& __y, index_sequence<_Is...>) { + _Ret __result = strong_ordering::equal; + static_cast<void>( + ((__result = std::__synth_three_way(std::get<_Is>(__x), std::get<_Is>(__y)), __result != 0) || ...)); + return __result; +} +# endif // _LIBCPP_STD_VER >= 20 + +# if _LIBCPP_STD_VER >= 23 +template <class _Tp> +concept __tuple_like_no_tuple = __tuple_like<_Tp> && !__is_tuple_v<_Tp>; + +template <class _Tp, class _Up, class _IndexSeq> +struct __tuple_common_comparison_category_impl {}; + +// TODO(LLVM 23): Remove `tuple_size_v<_Tp> == tuple_size_v<_Up>` here once once LLVM-20 support ends +// because the resolution of CWG2369 landed in LLVM-21. +template <class _Tp, class _Up, size_t... _Is> + requires(tuple_size_v<_Tp> == tuple_size_v<_Up>) && requires { + typename common_comparison_category_t< + __synth_three_way_result<tuple_element_t<_Is, _Tp>, tuple_element_t<_Is, _Up>>...>; + } +struct __tuple_common_comparison_category_impl<_Tp, _Up, index_sequence<_Is...>> { + using type _LIBCPP_NODEBUG = + common_comparison_category_t<__synth_three_way_result<tuple_element_t<_Is, _Tp>, tuple_element_t<_Is, _Up>>...>; +}; + +template <__tuple_like _Tp, __tuple_like _Up> +using __tuple_common_comparison_category _LIBCPP_NODEBUG = + __tuple_common_comparison_category_impl<_Tp, _Up, make_index_sequence<tuple_size_v<_Tp>>>::type; +# endif // _LIBCPP_STD_VER >= 23 + +// __tuple_leaf + +template <size_t _Ip, class _Hp, bool = is_empty<_Hp>::value && !__is_final_v<_Hp> > +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_; + +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(!__reference_constructs_from_temporary_v<_Hp, _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(!__reference_constructs_from_temporary_v<_Hp, _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 __remove_cv_t<_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 {} + +// __tuple_impl + +template <class _Indx, class... _Tp> +struct __tuple_impl; + +struct __forward_args {}; +struct __value_init {}; +struct __from_tuple {}; + +template <size_t... _Indx, class... _Tp> +struct _LIBCPP_DECLSPEC_EMPTY_BASES + __tuple_impl<__index_sequence<_Indx...>, _Tp...> : public __tuple_leaf<_Indx, _Tp>... { + _LIBCPP_HIDE_FROM_ABI constexpr __tuple_impl() noexcept( + __all<is_nothrow_default_constructible<_Tp>::value...>::value) {} + + template <class... _Args> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl(__forward_args, _Args&&... __args) + : __tuple_leaf<_Indx, _Tp>(std::forward<_Args>(__args))... {} + + template <class _Alloc> + _LIBCPP_HIDE_FROM_ABI + _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl(allocator_arg_t, const _Alloc& __alloc, __value_init) + : __tuple_leaf<_Indx, _Tp>(__uses_alloc_ctor<_Tp, _Alloc>(), __alloc)... {} + + template <class _Alloc, class... _Args> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit __tuple_impl( + allocator_arg_t, const _Alloc& __alloc, __forward_args, _Args&&... __args) + : __tuple_leaf<_Indx, _Tp>(__uses_alloc_ctor<_Tp, _Alloc, _Args>(), __alloc, std::forward<_Args>(__args))... {} + + template <class _Tuple> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_impl(__from_tuple, _Tuple&& __t) noexcept( + (__all<is_nothrow_constructible<_Tp, __copy_cvref_t<_Tuple, __tuple_element_t<_Indx, __remove_cvref_t<_Tuple>>>>:: + value...>::value)) + : __tuple_leaf<_Indx, _Tp>( + std::forward<__copy_cvref_t<_Tuple, __tuple_element_t<_Indx, __remove_cvref_t<_Tuple>>>>( + std::get<_Indx>(__t)))... {} + + template <class _Alloc, class _Tuple> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 + __tuple_impl(allocator_arg_t, const _Alloc& __a, __from_tuple, _Tuple&& __t) + : __tuple_leaf<_Indx, _Tp>( + __uses_alloc_ctor<_Tp, + _Alloc, + __copy_cvref_t<_Tuple, __tuple_element_t<_Indx, __remove_cvref_t<_Tuple>>>>(), + __a, + std::forward<__copy_cvref_t<_Tuple, __tuple_element_t<_Indx, __remove_cvref_t<_Tuple>>>>( + 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, __index_sequence<_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, __type_list<_Up...>, __index_sequence<_Np...>) { + std::__swallow(((std::get<_Np>(__dest) = std::forward<_Up>(std::get<_Np>(__source))), void(), 0)...); +} + +template <class... _Tp> +class _LIBCPP_NO_SPECIALIZATIONS tuple { + typedef __tuple_impl<__index_sequence_for<_Tp...>, _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 _LIBCPP_NODEBUG = + __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, __value_init{}) {} + + // 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_(__forward_args{}, __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, __forward_args{}, __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_(__forward_args{}, 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, __forward_args{}, 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, __from_tuple(), __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, __from_tuple(), 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_(__from_tuple(), __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, __from_tuple(), __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_(__from_tuple(), __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, __from_tuple(), __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_(__from_tuple(), 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, __from_tuple(), 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_(__from_tuple(), 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, __from_tuple(), 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_(__from_tuple(), __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, __from_tuple(), __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_(__from_tuple(), __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, __from_tuple(), __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_(__from_tuple(), 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, __from_tuple(), 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_(__from_tuple(), 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, __from_tuple(), 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, __index_sequence_for<_Tp...>()); + 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, __index_sequence_for<_Tp...>()); + 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), __type_list<_Tp...>(), __index_sequence_for<_Tp...>()); + 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), __type_list<_Tp...>(), __index_sequence_for<_Tp...>()); + 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, __index_sequence_for<_Tp...>()); + 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), __type_list<_Up...>(), __index_sequence_for<_Tp...>()); + 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, index_sequence_for<_Tp...>()); + 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, __type_list<_UTypes...>(), index_sequence_for<_Tp...>()); + 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, __index_sequence_for<_Tp...>()); + 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), __type_list<_If<true, _Up, _Tp>...>(), __index_sequence_for<_Tp...>()); + 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_); + } + + template <__tuple_like_no_tuple _UTuple> +# if _LIBCPP_STD_VER >= 26 + requires __can_tuple_compare_equal<tuple, _UTuple> && (sizeof...(_Tp) == tuple_size_v<_UTuple>) +# endif // _LIBCPP_STD_VER >= 26 + _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const tuple& __x, const _UTuple& __y) { + static_assert(sizeof...(_Tp) == tuple_size_v<_UTuple>, "Can't compare tuple-like values of different sizes"); + return std::__tuple_compare_equal<sizeof...(_Tp)>(__x, __y); + } + + template <__tuple_like_no_tuple _UTuple> + requires(sizeof...(_Tp) == tuple_size_v<_UTuple>) + _LIBCPP_HIDE_FROM_ABI friend constexpr __tuple_common_comparison_category<tuple, _UTuple> + operator<=>(const tuple& __x, const _UTuple& __y) { + return std::__tuple_compare_three_way<__tuple_common_comparison_category<tuple, _UTuple>>( + __x, __y, index_sequence_for<_Tp...>{}); + } +# endif // _LIBCPP_STD_VER >= 23 +}; + +_LIBCPP_DIAGNOSTIC_PUSH +# if __has_warning("-Winvalid-specialization") +_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Winvalid-specialization") +# endif +template <> +class 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 {} + + template <__tuple_like_no_tuple _UTuple> +# if _LIBCPP_STD_VER >= 26 + requires(tuple_size_v<_UTuple> == 0) +# endif // _LIBCPP_STD_VER >= 26 + _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const tuple&, const _UTuple&) { + static_assert(tuple_size_v<_UTuple> == 0, "Can't compare tuple-like values of different sizes"); + return true; + } + + template <__tuple_like_no_tuple _UTuple> + requires(tuple_size_v<_UTuple> == 0) + _LIBCPP_HIDE_FROM_ABI friend constexpr strong_ordering operator<=>(const tuple&, const _UTuple&) { + return strong_ordering::equal; + } +# endif +}; +_LIBCPP_DIAGNOSTIC_POP + +# 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 _LIBCPP_NODEBUG = 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 _LIBCPP_NODEBUG = 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> +[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 +typename tuple_element<_Ip, tuple<_Tp...> >::type& +get(tuple<_Tp...>& __t) _NOEXCEPT { + using type _LIBCPP_NODEBUG = typename tuple_element<_Ip, tuple<_Tp...> >::type; + return static_cast<__tuple_leaf<_Ip, type>&>(__t.__base_).get(); +} + +template <size_t _Ip, class... _Tp> +[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI +_LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type& +get(const tuple<_Tp...>& __t) _NOEXCEPT { + using type _LIBCPP_NODEBUG = typename tuple_element<_Ip, tuple<_Tp...> >::type; + return static_cast<const __tuple_leaf<_Ip, type>&>(__t.__base_).get(); +} + +template <size_t _Ip, class... _Tp> +[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 +typename tuple_element<_Ip, tuple<_Tp...> >::type&& +get(tuple<_Tp...>&& __t) _NOEXCEPT { + using type _LIBCPP_NODEBUG = typename tuple_element<_Ip, tuple<_Tp...> >::type; + return static_cast<type&&>(static_cast<__tuple_leaf<_Ip, type>&&>(__t.__base_).get()); +} + +template <size_t _Ip, class... _Tp> +[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI +_LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&& +get(const tuple<_Tp...>&& __t) _NOEXCEPT { + using type _LIBCPP_NODEBUG = typename tuple_element<_Ip, tuple<_Tp...> >::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> +[[__nodiscard__]] 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> +[[__nodiscard__]] 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> +[[__nodiscard__]] 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> +[[__nodiscard__]] 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> +[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<_Tp&...> tie(_Tp&... __t) _NOEXCEPT { + return tuple<_Tp&...>(__t...); +} + +template <class... _Tp> +[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 tuple<__unwrap_ref_decay_t<_Tp>...> +make_tuple(_Tp&&... __t) { + return tuple<__unwrap_ref_decay_t<_Tp>...>(std::forward<_Tp>(__t)...); +} + +template <class... _Tp> +[[__nodiscard__]] 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 <class... _Tp, class... _Up> +# if _LIBCPP_STD_VER >= 26 + requires(__all<requires(const _Tp& __t, const _Up& __u) { + { __t == __u } -> __boolean_testable; + }...>::value && (sizeof...(_Tp) == sizeof...(_Up))) +# endif +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 std::__tuple_compare_equal<sizeof...(_Tp)>(__x, __y); +} + +# if _LIBCPP_STD_VER >= 20 + +// operator<=> + +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<common_comparison_category_t<__synth_three_way_result<_Tp, _Up>...>>( + __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... _Tuples> +struct __tuple_cat_return_impl; + +template <class... _Types> +struct __tuple_cat_return_impl<tuple<_Types...>> { + using type _LIBCPP_NODEBUG = tuple<_Types...>; +}; + +template <class... _Types0, class... _Types1, class... _Tuples> +struct __tuple_cat_return_impl<tuple<_Types0...>, tuple<_Types1...>, _Tuples...> + : __tuple_cat_return_impl<tuple<_Types0..., _Types1...>, _Tuples...> {}; + +template <class... _Types0, class _Tp, class _Up, class... _Tuples> +struct __tuple_cat_return_impl<tuple<_Types0...>, pair<_Tp, _Up>, _Tuples...> + : __tuple_cat_return_impl<tuple<_Types0..., _Tp, _Up>, _Tuples...> {}; + +template <class, class, class> +struct __tuple_cat_array; + +template <class... _Types, class _ValueT, size_t... _Indices> +struct __tuple_cat_array<tuple<_Types...>, _ValueT, __index_sequence<_Indices...>> { + template <size_t> + using __value_type _LIBCPP_NODEBUG = _ValueT; + + using type _LIBCPP_NODEBUG = tuple<_Types..., __value_type<_Indices>...>; +}; + +template <class... _Types, class _ValueT, size_t _Np, class... _Tuples> +struct __tuple_cat_return_impl<tuple<_Types...>, array<_ValueT, _Np>, _Tuples...> + : __tuple_cat_return_impl<typename __tuple_cat_array<tuple<_Types...>, _ValueT, __make_index_sequence<_Np>>::type, + _Tuples...> {}; + +template <class... _Tuples> +using __tuple_cat_return_t _LIBCPP_NODEBUG = + typename __tuple_cat_return_impl<tuple<>, __remove_cvref_t<_Tuples>...>::type; + +[[__nodiscard__]] 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...>, __index_sequence<_I0...>, _Tuple0> { + using _T0 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple0>; + 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...>, __index_sequence<_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>&&...>, + __make_index_sequence<tuple_size<__libcpp_remove_reference_t<_Tuple1> >::value>, + _Tuple1, + _Tuples...> {}; + +template <class _Tuple0, class... _Tuples> +struct __tuple_cat_return_ref + : public __tuple_cat_return_ref_imp< + tuple<>, + __make_index_sequence< tuple_size<__libcpp_remove_reference_t<_Tuple0> >::value >, + _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...>, __index_sequence<_I0...>, __index_sequence<_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 + using _T0 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple0>; + using _T1 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple1>; + return __tuple_cat<tuple<_Types..., __copy_cvref_t<_Tuple0, typename tuple_element<_J0, _T0>::type>&&...>, + __make_index_sequence<sizeof...(_Types) + tuple_size<_T0>::value>, + __make_index_sequence<tuple_size<_T1>::value>>()( + 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 _TupleDst, class _TupleSrc, size_t... _Indices> +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _TupleDst +__tuple_cat_select_element_wise(_TupleSrc&& __src, __index_sequence<_Indices...>) { + static_assert(tuple_size<_TupleDst>::value == tuple_size<_TupleSrc>::value, + "misuse of __tuple_cat_select_element_wise with tuples of different sizes"); + return _TupleDst(std::get<_Indices>(std::forward<_TupleSrc>(__src))...); +} + +template <class _Tuple0, class... _Tuples> +[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_cat_return_t<_Tuple0, _Tuples...> +tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls) { + using _T0 _LIBCPP_NODEBUG = __libcpp_remove_reference_t<_Tuple0>; + using _TRet _LIBCPP_NODEBUG = __tuple_cat_return_t<_Tuple0, _Tuples...>; + using _T0Indices _LIBCPP_NODEBUG = __make_index_sequence<tuple_size<_T0>::value>; + using _TRetIndices _LIBCPP_NODEBUG = __make_index_sequence<tuple_size<_TRet>::value>; + return std::__tuple_cat_select_element_wise<_TRet>( + __tuple_cat<tuple<>, __index_sequence<>, _T0Indices>()( + tuple<>(), std::forward<_Tuple0>(__t0), std::forward<_Tuples>(__tpls)...), + _TRetIndices()); +} + +template <class... _Tp, class _Alloc> +struct 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, index_sequence<_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), + make_index_sequence<tuple_size_v<remove_reference_t<_Tuple>>>())) + +#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, index_sequence<_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, index_sequence<_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 +#undef _LIBCPP_NOEXCEPT_RETURN + +template <class _Tp, class _Tuple, + class _Seq = make_index_sequence<tuple_size_v<remove_reference_t<_Tuple>>>, 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, index_sequence<_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 + +[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp make_from_tuple(_Tuple&& __t) + noexcept(noexcept(std::__make_from_tuple_impl<_Tp>(std::forward<_Tuple>(__t), + make_index_sequence<tuple_size_v<remove_reference_t<_Tuple>>>()))) { +#if _LIBCPP_STD_VER >= 23 + if constexpr (tuple_size_v<remove_reference_t<_Tuple>> == 1) { + static_assert(!std::reference_constructs_from_temporary_v<_Tp, decltype(std::get<0>(std::declval<_Tuple>()))>, + "Attempted construction of reference element binds to a temporary whose lifetime has ended"); + } +#endif // _LIBCPP_STD_VER >= 23 + return std::__make_from_tuple_impl<_Tp>( + std::forward<_Tuple>(__t), make_index_sequence<tuple_size_v<remove_reference_t<_Tuple>>>()); +} + +# 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 <cstddef> +# include <exception> +# include <iosfwd> +# include <new> +# include <type_traits> +# include <typeinfo> +# include <utility> +# endif +#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS) + +#endif // _LIBCPP_TUPLE |