// -*- 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 inline constexpr unspecified 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 <__assert> // all public C++ headers provide the assertion handler #include <__compare/common_comparison_category.h> #include <__compare/synth_three_way.h> #include <__config> #include <__functional/invoke.h> #include <__fwd/array.h> #include <__fwd/get.h> #include <__fwd/tuple.h> #include <__memory/allocator_arg_t.h> #include <__memory/uses_allocator.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/apply_cv.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_copy_assignable.h> #include <__type_traits/is_copy_constructible.h> #include <__type_traits/is_default_constructible.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_move_assignable.h> #include <__type_traits/is_move_constructible.h> #include <__type_traits/is_nothrow_assignable.h> #include <__type_traits/is_nothrow_constructible.h> #include <__type_traits/is_nothrow_copy_assignable.h> #include <__type_traits/is_nothrow_copy_constructible.h> #include <__type_traits/is_nothrow_default_constructible.h> #include <__type_traits/is_nothrow_move_assignable.h> #include <__type_traits/is_reference.h> #include <__type_traits/is_same.h> #include <__type_traits/is_swappable.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/pair.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<_Hp>::value) { 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<const _Hp>::value) { 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 } _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&); public: _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, class = __enable_if_t< _And< _IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value > > _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<__tuple_leaf>::value) { 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<const __tuple_leaf>::value) { 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 { _LIBCPP_CONSTEXPR_SINCE_CXX14 __tuple_leaf& operator=(const __tuple_leaf&); public: _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, class = __enable_if_t< _And< _IsNotSame<__remove_cvref_t<_Tp>, __tuple_leaf>, is_constructible<_Hp, _Tp> >::value > > _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<__tuple_leaf>::value) { 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<const __tuple_leaf>::value) { 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, class = __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value> > _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, class = __enable_if_t<__tuple_constructible<_Tuple, tuple<_Tp...> >::value> > _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<_Tp>::value...>::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<const _Tp>::value...>::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: // [tuple.cnstr] _LIBCPP_DIAGNOSTIC_PUSH _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++20-extensions") _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++20-extensions") // 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 _LIBCPP_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 _LIBCPP_DIAGNOSTIC_POP // [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, class = __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up const&>... >::value > > _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, class = __enable_if_t< _And< _BoolConstant<_Np == sizeof...(_Tp)>, is_assignable<_Tp&, _Up>... >::value > > _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<_Tp>::value...>::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<_Tp>::value...>::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<_Tp>::value...>::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 namespace __find_detail { static constexpr size_t __not_found = static_cast<size_t>(-1); static constexpr size_t __ambiguous = __not_found - 1; inline _LIBCPP_HIDE_FROM_ABI constexpr size_t __find_idx_return(size_t __curr_i, size_t __res, bool __matches) { return !__matches ? __res : (__res == __not_found ? __curr_i : __ambiguous); } template <size_t _Nx> inline _LIBCPP_HIDE_FROM_ABI constexpr size_t __find_idx(size_t __i, const bool (&__matches)[_Nx]) { return __i == _Nx ? __not_found : __find_detail::__find_idx_return(__i, __find_detail::__find_idx(__i + 1, __matches), __matches[__i]); } template <class _T1, class... _Args> struct __find_exactly_one_checked { static constexpr bool __matches[sizeof...(_Args)] = {is_same<_T1, _Args>::value...}; static constexpr size_t value = __find_detail::__find_idx(0, __matches); static_assert(value != __not_found, "type not found in type list"); static_assert(value != __ambiguous, "type occurs more than once in type list"); }; template <class _T1> struct __find_exactly_one_checked<_T1> { static_assert(!is_same<_T1, _T1>::value, "type not in empty type list"); }; } // namespace __find_detail template <typename _T1, typename... _Args> struct __find_exactly_one_t : public __find_detail::__find_exactly_one_checked<_T1, _Args...> {}; 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 _Up> struct __ignore_t { template <class _Tp> _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const __ignore_t& operator=(_Tp&&) const { return *this; } }; # if _LIBCPP_STD_VER >= 17 inline constexpr __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>(); # else namespace { constexpr __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>(); } // namespace # endif 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..., __apply_cv_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..., __apply_cv_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..., __apply_cv_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 {}; template <class _T1, class _T2> template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2> inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_T1, _T2>::pair( piecewise_construct_t, tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args, __tuple_indices<_I1...>, __tuple_indices<_I2...>) : first(std::forward<_Args1>(std::get<_I1>(__first_args))...), second(std::forward<_Args2>(std::get<_I2>(__second_args))...) {} # if _LIBCPP_STD_VER >= 17 template <class _Tp> inline constexpr size_t tuple_size_v = tuple_size<_Tp>::value; # 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{})) template <class _Tp, class _Tuple, size_t... _Idx> inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>) _LIBCPP_NOEXCEPT_RETURN(_Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...)) template <class _Tp, class _Tuple> 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