| //===----------------------------------------------------------------------===// |
| // |
| // 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___UTILITY_PAIR_H |
| #define _LIBCPP___UTILITY_PAIR_H |
| |
| #include <__compare/common_comparison_category.h> |
| #include <__compare/synth_three_way.h> |
| #include <__config> |
| #include <__functional/unwrap_ref.h> |
| #include <__fwd/get.h> |
| #include <__fwd/tuple.h> |
| #include <__tuple/sfinae_helpers.h> |
| #include <__tuple/tuple_element.h> |
| #include <__tuple/tuple_indices.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/decay.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_default_constructible.h> |
| #include <__type_traits/is_implicitly_default_constructible.h> |
| #include <__type_traits/is_move_assignable.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_same.h> |
| #include <__type_traits/is_swappable.h> |
| #include <__type_traits/nat.h> |
| #include <__utility/forward.h> |
| #include <__utility/move.h> |
| #include <__utility/piecewise_construct.h> |
| #include <cstddef> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template <class, class> |
| struct __non_trivially_copyable_base { |
| _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI |
| __non_trivially_copyable_base() _NOEXCEPT {} |
| _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI |
| __non_trivially_copyable_base(__non_trivially_copyable_base const&) _NOEXCEPT {} |
| }; |
| |
| template <class _T1, class _T2> |
| struct _LIBCPP_TEMPLATE_VIS pair |
| #if defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR) |
| : private __non_trivially_copyable_base<_T1, _T2> |
| #endif |
| { |
| using first_type = _T1; |
| using second_type = _T2; |
| |
| _T1 first; |
| _T2 second; |
| |
| pair(pair const&) = default; |
| pair(pair&&) = default; |
| |
| #ifdef _LIBCPP_CXX03_LANG |
| _LIBCPP_HIDE_FROM_ABI |
| pair() : first(), second() {} |
| |
| _LIBCPP_HIDE_FROM_ABI |
| pair(_T1 const& __t1, _T2 const& __t2) : first(__t1), second(__t2) {} |
| |
| template <class _U1, class _U2> |
| _LIBCPP_HIDE_FROM_ABI |
| pair(const pair<_U1, _U2>& __p) : first(__p.first), second(__p.second) {} |
| |
| _LIBCPP_HIDE_FROM_ABI |
| pair& operator=(pair const& __p) { |
| first = __p.first; |
| second = __p.second; |
| return *this; |
| } |
| #else |
| struct _CheckArgs { |
| template <int&...> |
| static constexpr bool __enable_explicit_default() { |
| return is_default_constructible<_T1>::value |
| && is_default_constructible<_T2>::value |
| && !__enable_implicit_default<>(); |
| } |
| |
| template <int&...> |
| static constexpr bool __enable_implicit_default() { |
| return __is_implicitly_default_constructible<_T1>::value |
| && __is_implicitly_default_constructible<_T2>::value; |
| } |
| |
| template <class _U1, class _U2> |
| static constexpr bool __is_pair_constructible() { |
| return is_constructible<first_type, _U1>::value |
| && is_constructible<second_type, _U2>::value; |
| } |
| |
| template <class _U1, class _U2> |
| static constexpr bool __is_implicit() { |
| return is_convertible<_U1, first_type>::value |
| && is_convertible<_U2, second_type>::value; |
| } |
| |
| template <class _U1, class _U2> |
| static constexpr bool __enable_explicit() { |
| return __is_pair_constructible<_U1, _U2>() && !__is_implicit<_U1, _U2>(); |
| } |
| |
| template <class _U1, class _U2> |
| static constexpr bool __enable_implicit() { |
| return __is_pair_constructible<_U1, _U2>() && __is_implicit<_U1, _U2>(); |
| } |
| }; |
| |
| template <bool _MaybeEnable> |
| using _CheckArgsDep _LIBCPP_NODEBUG = typename conditional< |
| _MaybeEnable, _CheckArgs, __check_tuple_constructor_fail>::type; |
| |
| struct _CheckTupleLikeConstructor { |
| template <class _Tuple> |
| static constexpr bool __enable_implicit() { |
| return __tuple_convertible<_Tuple, pair>::value; |
| } |
| |
| template <class _Tuple> |
| static constexpr bool __enable_explicit() { |
| return __tuple_constructible<_Tuple, pair>::value |
| && !__tuple_convertible<_Tuple, pair>::value; |
| } |
| |
| template <class _Tuple> |
| static constexpr bool __enable_assign() { |
| return __tuple_assignable<_Tuple, pair>::value; |
| } |
| }; |
| |
| template <class _Tuple> |
| using _CheckTLC _LIBCPP_NODEBUG = __conditional_t< |
| __tuple_like_with_size<_Tuple, 2>::value |
| && !is_same<__decay_t<_Tuple>, pair>::value, |
| _CheckTupleLikeConstructor, |
| __check_tuple_constructor_fail |
| >; |
| |
| template<bool _Dummy = true, typename enable_if< |
| _CheckArgsDep<_Dummy>::__enable_explicit_default() |
| >::type* = nullptr> |
| explicit _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR |
| pair() _NOEXCEPT_(is_nothrow_default_constructible<first_type>::value && |
| is_nothrow_default_constructible<second_type>::value) |
| : first(), second() {} |
| |
| template<bool _Dummy = true, typename enable_if< |
| _CheckArgsDep<_Dummy>::__enable_implicit_default() |
| >::type* = nullptr> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR |
| pair() _NOEXCEPT_(is_nothrow_default_constructible<first_type>::value && |
| is_nothrow_default_constructible<second_type>::value) |
| : first(), second() {} |
| |
| template <bool _Dummy = true, typename enable_if< |
| _CheckArgsDep<_Dummy>::template __enable_explicit<_T1 const&, _T2 const&>() |
| >::type* = nullptr> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| explicit pair(_T1 const& __t1, _T2 const& __t2) |
| _NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value && |
| is_nothrow_copy_constructible<second_type>::value) |
| : first(__t1), second(__t2) {} |
| |
| template<bool _Dummy = true, typename enable_if< |
| _CheckArgsDep<_Dummy>::template __enable_implicit<_T1 const&, _T2 const&>() |
| >::type* = nullptr> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| pair(_T1 const& __t1, _T2 const& __t2) |
| _NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value && |
| is_nothrow_copy_constructible<second_type>::value) |
| : first(__t1), second(__t2) {} |
| |
| template < |
| #if _LIBCPP_STD_VER >= 23 // http://wg21.link/P1951 |
| class _U1 = _T1, class _U2 = _T2, |
| #else |
| class _U1, class _U2, |
| #endif |
| typename enable_if<_CheckArgs::template __enable_explicit<_U1, _U2>()>::type* = nullptr |
| > |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| explicit pair(_U1&& __u1, _U2&& __u2) |
| _NOEXCEPT_((is_nothrow_constructible<first_type, _U1>::value && |
| is_nothrow_constructible<second_type, _U2>::value)) |
| : first(std::forward<_U1>(__u1)), second(std::forward<_U2>(__u2)) {} |
| |
| template < |
| #if _LIBCPP_STD_VER >= 23 // http://wg21.link/P1951 |
| class _U1 = _T1, class _U2 = _T2, |
| #else |
| class _U1, class _U2, |
| #endif |
| typename enable_if<_CheckArgs::template __enable_implicit<_U1, _U2>()>::type* = nullptr |
| > |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| pair(_U1&& __u1, _U2&& __u2) |
| _NOEXCEPT_((is_nothrow_constructible<first_type, _U1>::value && |
| is_nothrow_constructible<second_type, _U2>::value)) |
| : first(std::forward<_U1>(__u1)), second(std::forward<_U2>(__u2)) {} |
| |
| #if _LIBCPP_STD_VER >= 23 |
| template<class _U1, class _U2, __enable_if_t< |
| _CheckArgs::template __is_pair_constructible<_U1&, _U2&>() |
| >* = nullptr> |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| explicit(!_CheckArgs::template __is_implicit<_U1&, _U2&>()) pair(pair<_U1, _U2>& __p) |
| noexcept((is_nothrow_constructible<first_type, _U1&>::value && |
| is_nothrow_constructible<second_type, _U2&>::value)) |
| : first(__p.first), second(__p.second) {} |
| #endif |
| |
| template<class _U1, class _U2, typename enable_if< |
| _CheckArgs::template __enable_explicit<_U1 const&, _U2 const&>() |
| >::type* = nullptr> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| explicit pair(pair<_U1, _U2> const& __p) |
| _NOEXCEPT_((is_nothrow_constructible<first_type, _U1 const&>::value && |
| is_nothrow_constructible<second_type, _U2 const&>::value)) |
| : first(__p.first), second(__p.second) {} |
| |
| template<class _U1, class _U2, typename enable_if< |
| _CheckArgs::template __enable_implicit<_U1 const&, _U2 const&>() |
| >::type* = nullptr> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| pair(pair<_U1, _U2> const& __p) |
| _NOEXCEPT_((is_nothrow_constructible<first_type, _U1 const&>::value && |
| is_nothrow_constructible<second_type, _U2 const&>::value)) |
| : first(__p.first), second(__p.second) {} |
| |
| template<class _U1, class _U2, typename enable_if< |
| _CheckArgs::template __enable_explicit<_U1, _U2>() |
| >::type* = nullptr> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| explicit pair(pair<_U1, _U2>&&__p) |
| _NOEXCEPT_((is_nothrow_constructible<first_type, _U1&&>::value && |
| is_nothrow_constructible<second_type, _U2&&>::value)) |
| : first(std::forward<_U1>(__p.first)), second(std::forward<_U2>(__p.second)) {} |
| |
| template<class _U1, class _U2, typename enable_if< |
| _CheckArgs::template __enable_implicit<_U1, _U2>() |
| >::type* = nullptr> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| pair(pair<_U1, _U2>&& __p) |
| _NOEXCEPT_((is_nothrow_constructible<first_type, _U1&&>::value && |
| is_nothrow_constructible<second_type, _U2&&>::value)) |
| : first(std::forward<_U1>(__p.first)), second(std::forward<_U2>(__p.second)) {} |
| |
| #if _LIBCPP_STD_VER >= 23 |
| template<class _U1, class _U2, __enable_if_t< |
| _CheckArgs::template __is_pair_constructible<const _U1&&, const _U2&&>() |
| >* = nullptr> |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| explicit(!_CheckArgs::template __is_implicit<const _U1&&, const _U2&&>()) |
| pair(const pair<_U1, _U2>&& __p) |
| noexcept(is_nothrow_constructible<first_type, const _U1&&>::value && |
| is_nothrow_constructible<second_type, const _U2&&>::value) |
| : first(std::move(__p.first)), second(std::move(__p.second)) {} |
| #endif |
| |
| template<class _Tuple, typename enable_if< |
| _CheckTLC<_Tuple>::template __enable_explicit<_Tuple>() |
| >::type* = nullptr> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| explicit pair(_Tuple&& __p) |
| : first(std::get<0>(std::forward<_Tuple>(__p))), |
| second(std::get<1>(std::forward<_Tuple>(__p))) {} |
| |
| template<class _Tuple, typename enable_if< |
| _CheckTLC<_Tuple>::template __enable_implicit<_Tuple>() |
| >::type* = nullptr> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| pair(_Tuple&& __p) |
| : first(std::get<0>(std::forward<_Tuple>(__p))), |
| second(std::get<1>(std::forward<_Tuple>(__p))) {} |
| |
| template <class... _Args1, class... _Args2> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 |
| pair(piecewise_construct_t __pc, |
| tuple<_Args1...> __first_args, tuple<_Args2...> __second_args) |
| _NOEXCEPT_((is_nothrow_constructible<first_type, _Args1...>::value && |
| is_nothrow_constructible<second_type, _Args2...>::value)) |
| : pair(__pc, __first_args, __second_args, |
| typename __make_tuple_indices<sizeof...(_Args1)>::type(), |
| typename __make_tuple_indices<sizeof...(_Args2) >::type()) {} |
| |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 |
| pair& operator=(__conditional_t< |
| is_copy_assignable<first_type>::value && |
| is_copy_assignable<second_type>::value, |
| pair, __nat> const& __p) |
| _NOEXCEPT_(is_nothrow_copy_assignable<first_type>::value && |
| is_nothrow_copy_assignable<second_type>::value) |
| { |
| first = __p.first; |
| second = __p.second; |
| return *this; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 |
| pair& operator=(__conditional_t< |
| is_move_assignable<first_type>::value && |
| is_move_assignable<second_type>::value, |
| pair, __nat>&& __p) |
| _NOEXCEPT_(is_nothrow_move_assignable<first_type>::value && |
| is_nothrow_move_assignable<second_type>::value) |
| { |
| first = std::forward<first_type>(__p.first); |
| second = std::forward<second_type>(__p.second); |
| return *this; |
| } |
| |
| #if _LIBCPP_STD_VER >= 23 |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| const pair& operator=(pair const& __p) const |
| noexcept(is_nothrow_copy_assignable_v<const first_type> && |
| is_nothrow_copy_assignable_v<const second_type>) |
| requires(is_copy_assignable_v<const first_type> && |
| is_copy_assignable_v<const second_type>) { |
| first = __p.first; |
| second = __p.second; |
| return *this; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| const pair& operator=(pair&& __p) const |
| noexcept(is_nothrow_assignable_v<const first_type&, first_type> && |
| is_nothrow_assignable_v<const second_type&, second_type>) |
| requires(is_assignable_v<const first_type&, first_type> && |
| is_assignable_v<const second_type&, second_type>) { |
| first = std::forward<first_type>(__p.first); |
| second = std::forward<second_type>(__p.second); |
| return *this; |
| } |
| |
| template<class _U1, class _U2> |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| const pair& operator=(const pair<_U1, _U2>& __p) const |
| requires(is_assignable_v<const first_type&, const _U1&> && |
| is_assignable_v<const second_type&, const _U2&>) { |
| first = __p.first; |
| second = __p.second; |
| return *this; |
| } |
| |
| template<class _U1, class _U2> |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| const pair& operator=(pair<_U1, _U2>&& __p) const |
| requires(is_assignable_v<const first_type&, _U1> && |
| is_assignable_v<const second_type&, _U2>) { |
| first = std::forward<_U1>(__p.first); |
| second = std::forward<_U2>(__p.second); |
| return *this; |
| } |
| #endif // _LIBCPP_STD_VER >= 23 |
| |
| template <class _Tuple, typename enable_if< |
| _CheckTLC<_Tuple>::template __enable_assign<_Tuple>() |
| >::type* = nullptr> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 |
| pair& operator=(_Tuple&& __p) { |
| first = std::get<0>(std::forward<_Tuple>(__p)); |
| second = std::get<1>(std::forward<_Tuple>(__p)); |
| return *this; |
| } |
| #endif // _LIBCPP_CXX03_LANG |
| |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 |
| void |
| swap(pair& __p) _NOEXCEPT_(__is_nothrow_swappable<first_type>::value && |
| __is_nothrow_swappable<second_type>::value) |
| { |
| using std::swap; |
| swap(first, __p.first); |
| swap(second, __p.second); |
| } |
| |
| #if _LIBCPP_STD_VER >= 23 |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| void swap(const pair& __p) const |
| noexcept(__is_nothrow_swappable<const first_type>::value && |
| __is_nothrow_swappable<const second_type>::value) |
| { |
| using std::swap; |
| swap(first, __p.first); |
| swap(second, __p.second); |
| } |
| #endif |
| private: |
| |
| #ifndef _LIBCPP_CXX03_LANG |
| template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 |
| pair(piecewise_construct_t, |
| tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args, |
| __tuple_indices<_I1...>, __tuple_indices<_I2...>); |
| #endif |
| }; |
| |
| #if _LIBCPP_STD_VER >= 17 |
| template<class _T1, class _T2> |
| pair(_T1, _T2) -> pair<_T1, _T2>; |
| #endif |
| |
| // [pairs.spec], specialized algorithms |
| |
| template <class _T1, class _T2, class _U1, class _U2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| bool |
| operator==(const pair<_T1,_T2>& __x, const pair<_U1,_U2>& __y) |
| { |
| return __x.first == __y.first && __x.second == __y.second; |
| } |
| |
| #if _LIBCPP_STD_VER >= 20 |
| |
| template <class _T1, class _T2, class _U1, class _U2> |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| common_comparison_category_t< |
| __synth_three_way_result<_T1, _U1>, |
| __synth_three_way_result<_T2, _U2> > |
| operator<=>(const pair<_T1,_T2>& __x, const pair<_U1,_U2>& __y) |
| { |
| if (auto __c = std::__synth_three_way(__x.first, __y.first); __c != 0) { |
| return __c; |
| } |
| return std::__synth_three_way(__x.second, __y.second); |
| } |
| |
| #else // _LIBCPP_STD_VER >= 20 |
| |
| template <class _T1, class _T2, class _U1, class _U2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| bool |
| operator!=(const pair<_T1,_T2>& __x, const pair<_U1,_U2>& __y) |
| { |
| return !(__x == __y); |
| } |
| |
| template <class _T1, class _T2, class _U1, class _U2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| bool |
| operator< (const pair<_T1,_T2>& __x, const pair<_U1,_U2>& __y) |
| { |
| return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second); |
| } |
| |
| template <class _T1, class _T2, class _U1, class _U2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| bool |
| operator> (const pair<_T1,_T2>& __x, const pair<_U1,_U2>& __y) |
| { |
| return __y < __x; |
| } |
| |
| template <class _T1, class _T2, class _U1, class _U2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| bool |
| operator>=(const pair<_T1,_T2>& __x, const pair<_U1,_U2>& __y) |
| { |
| return !(__x < __y); |
| } |
| |
| template <class _T1, class _T2, class _U1, class _U2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| bool |
| operator<=(const pair<_T1,_T2>& __x, const pair<_U1,_U2>& __y) |
| { |
| return !(__y < __x); |
| } |
| |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| #if _LIBCPP_STD_VER >= 23 |
| template <class _T1, class _T2, class _U1, class _U2, template<class> class _TQual, template<class> class _UQual> |
| requires requires { typename pair<common_reference_t<_TQual<_T1>, _UQual<_U1>>, |
| common_reference_t<_TQual<_T2>, _UQual<_U2>>>; } |
| struct basic_common_reference<pair<_T1, _T2>, pair<_U1, _U2>, _TQual, _UQual> { |
| using type = pair<common_reference_t<_TQual<_T1>, _UQual<_U1>>, |
| common_reference_t<_TQual<_T2>, _UQual<_U2>>>; |
| }; |
| |
| template <class _T1, class _T2, class _U1, class _U2> |
| requires requires { typename pair<common_type_t<_T1, _U1>, common_type_t<_T2, _U2>>; } |
| struct common_type<pair<_T1, _T2>, pair<_U1, _U2>> { |
| using type = pair<common_type_t<_T1, _U1>, common_type_t<_T2, _U2>>; |
| }; |
| #endif // _LIBCPP_STD_VER >= 23 |
| |
| template <class _T1, class _T2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 |
| typename enable_if |
| < |
| __is_swappable<_T1>::value && |
| __is_swappable<_T2>::value, |
| void |
| >::type |
| swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y) |
| _NOEXCEPT_((__is_nothrow_swappable<_T1>::value && |
| __is_nothrow_swappable<_T2>::value)) |
| { |
| __x.swap(__y); |
| } |
| |
| #if _LIBCPP_STD_VER >= 23 |
| template <class _T1, class _T2> |
| requires (__is_swappable<const _T1>::value && |
| __is_swappable<const _T2>::value) |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| void swap(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) |
| noexcept(noexcept(__x.swap(__y))) |
| { |
| __x.swap(__y); |
| } |
| #endif |
| |
| template <class _T1, class _T2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| pair<typename __unwrap_ref_decay<_T1>::type, typename __unwrap_ref_decay<_T2>::type> |
| make_pair(_T1&& __t1, _T2&& __t2) |
| { |
| return pair<typename __unwrap_ref_decay<_T1>::type, typename __unwrap_ref_decay<_T2>::type> |
| (std::forward<_T1>(__t1), std::forward<_T2>(__t2)); |
| } |
| |
| template <class _T1, class _T2> |
| struct _LIBCPP_TEMPLATE_VIS tuple_size<pair<_T1, _T2> > |
| : public integral_constant<size_t, 2> {}; |
| |
| template <size_t _Ip, class _T1, class _T2> |
| struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, pair<_T1, _T2> > |
| { |
| static_assert(_Ip < 2, "Index out of bounds in std::tuple_element<std::pair<T1, T2>>"); |
| }; |
| |
| template <class _T1, class _T2> |
| struct _LIBCPP_TEMPLATE_VIS tuple_element<0, pair<_T1, _T2> > |
| { |
| using type _LIBCPP_NODEBUG = _T1; |
| }; |
| |
| template <class _T1, class _T2> |
| struct _LIBCPP_TEMPLATE_VIS tuple_element<1, pair<_T1, _T2> > |
| { |
| using type _LIBCPP_NODEBUG = _T2; |
| }; |
| |
| template <size_t _Ip> struct __get_pair; |
| |
| template <> |
| struct __get_pair<0> |
| { |
| template <class _T1, class _T2> |
| static |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| _T1& |
| get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;} |
| |
| template <class _T1, class _T2> |
| static |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| const _T1& |
| get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;} |
| |
| template <class _T1, class _T2> |
| static |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| _T1&& |
| get(pair<_T1, _T2>&& __p) _NOEXCEPT {return std::forward<_T1>(__p.first);} |
| |
| template <class _T1, class _T2> |
| static |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| const _T1&& |
| get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return std::forward<const _T1>(__p.first);} |
| }; |
| |
| template <> |
| struct __get_pair<1> |
| { |
| template <class _T1, class _T2> |
| static |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| _T2& |
| get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;} |
| |
| template <class _T1, class _T2> |
| static |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| const _T2& |
| get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;} |
| |
| template <class _T1, class _T2> |
| static |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| _T2&& |
| get(pair<_T1, _T2>&& __p) _NOEXCEPT {return std::forward<_T2>(__p.second);} |
| |
| template <class _T1, class _T2> |
| static |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| const _T2&& |
| get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return std::forward<const _T2>(__p.second);} |
| }; |
| |
| template <size_t _Ip, class _T1, class _T2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| typename tuple_element<_Ip, pair<_T1, _T2> >::type& |
| get(pair<_T1, _T2>& __p) _NOEXCEPT |
| { |
| return __get_pair<_Ip>::get(__p); |
| } |
| |
| template <size_t _Ip, class _T1, class _T2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| const typename tuple_element<_Ip, pair<_T1, _T2> >::type& |
| get(const pair<_T1, _T2>& __p) _NOEXCEPT |
| { |
| return __get_pair<_Ip>::get(__p); |
| } |
| |
| template <size_t _Ip, class _T1, class _T2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| typename tuple_element<_Ip, pair<_T1, _T2> >::type&& |
| get(pair<_T1, _T2>&& __p) _NOEXCEPT |
| { |
| return __get_pair<_Ip>::get(std::move(__p)); |
| } |
| |
| template <size_t _Ip, class _T1, class _T2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| const typename tuple_element<_Ip, pair<_T1, _T2> >::type&& |
| get(const pair<_T1, _T2>&& __p) _NOEXCEPT |
| { |
| return __get_pair<_Ip>::get(std::move(__p)); |
| } |
| |
| #if _LIBCPP_STD_VER >= 14 |
| template <class _T1, class _T2> |
| inline _LIBCPP_HIDE_FROM_ABI |
| constexpr _T1 & get(pair<_T1, _T2>& __p) _NOEXCEPT |
| { |
| return __get_pair<0>::get(__p); |
| } |
| |
| template <class _T1, class _T2> |
| inline _LIBCPP_HIDE_FROM_ABI |
| constexpr _T1 const & get(pair<_T1, _T2> const& __p) _NOEXCEPT |
| { |
| return __get_pair<0>::get(__p); |
| } |
| |
| template <class _T1, class _T2> |
| inline _LIBCPP_HIDE_FROM_ABI |
| constexpr _T1 && get(pair<_T1, _T2>&& __p) _NOEXCEPT |
| { |
| return __get_pair<0>::get(std::move(__p)); |
| } |
| |
| template <class _T1, class _T2> |
| inline _LIBCPP_HIDE_FROM_ABI |
| constexpr _T1 const && get(pair<_T1, _T2> const&& __p) _NOEXCEPT |
| { |
| return __get_pair<0>::get(std::move(__p)); |
| } |
| |
| template <class _T1, class _T2> |
| inline _LIBCPP_HIDE_FROM_ABI |
| constexpr _T1 & get(pair<_T2, _T1>& __p) _NOEXCEPT |
| { |
| return __get_pair<1>::get(__p); |
| } |
| |
| template <class _T1, class _T2> |
| inline _LIBCPP_HIDE_FROM_ABI |
| constexpr _T1 const & get(pair<_T2, _T1> const& __p) _NOEXCEPT |
| { |
| return __get_pair<1>::get(__p); |
| } |
| |
| template <class _T1, class _T2> |
| inline _LIBCPP_HIDE_FROM_ABI |
| constexpr _T1 && get(pair<_T2, _T1>&& __p) _NOEXCEPT |
| { |
| return __get_pair<1>::get(std::move(__p)); |
| } |
| |
| template <class _T1, class _T2> |
| inline _LIBCPP_HIDE_FROM_ABI |
| constexpr _T1 const && get(pair<_T2, _T1> const&& __p) _NOEXCEPT |
| { |
| return __get_pair<1>::get(std::move(__p)); |
| } |
| |
| #endif // _LIBCPP_STD_VER >= 14 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___UTILITY_PAIR_H |
