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// <concepts> -*- C++ -*- // Copyright (C) 2019-2021 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file include/concepts * This is a Standard C++ Library header. * @ingroup concepts */ #ifndef _GLIBCXX_CONCEPTS #define _GLIBCXX_CONCEPTS 1 #if __cplusplus > 201703L && __cpp_concepts >= 201907L #pragma GCC system_header /** * @defgroup concepts Concepts * @ingroup utilities * * Concepts for checking type requirements. */ #include <type_traits> namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION #define __cpp_lib_concepts 202002L // [concepts.lang], language-related concepts namespace __detail { template<typename _Tp, typename _Up> concept __same_as = std::is_same_v<_Tp, _Up>; } // namespace __detail /// [concept.same], concept same_as template<typename _Tp, typename _Up> concept same_as = __detail::__same_as<_Tp, _Up> && __detail::__same_as<_Up, _Tp>; /// [concept.derived], concept derived_from template<typename _Derived, typename _Base> concept derived_from = __is_base_of(_Base, _Derived) && is_convertible_v<const volatile _Derived*, const volatile _Base*>; /// [concept.convertible], concept convertible_to template<typename _From, typename _To> concept convertible_to = is_convertible_v<_From, _To> && requires { static_cast<_To>(std::declval<_From>()); }; /// [concept.commonref], concept common_reference_with template<typename _Tp, typename _Up> concept common_reference_with = same_as<common_reference_t<_Tp, _Up>, common_reference_t<_Up, _Tp>> && convertible_to<_Tp, common_reference_t<_Tp, _Up>> && convertible_to<_Up, common_reference_t<_Tp, _Up>>; /// [concept.common], concept common_with template<typename _Tp, typename _Up> concept common_with = same_as<common_type_t<_Tp, _Up>, common_type_t<_Up, _Tp>> && requires { static_cast<common_type_t<_Tp, _Up>>(std::declval<_Tp>()); static_cast<common_type_t<_Tp, _Up>>(std::declval<_Up>()); } && common_reference_with<add_lvalue_reference_t<const _Tp>, add_lvalue_reference_t<const _Up>> && common_reference_with<add_lvalue_reference_t<common_type_t<_Tp, _Up>>, common_reference_t< add_lvalue_reference_t<const _Tp>, add_lvalue_reference_t<const _Up>>>; // [concepts.arithmetic], arithmetic concepts template<typename _Tp> concept integral = is_integral_v<_Tp>; template<typename _Tp> concept signed_integral = integral<_Tp> && is_signed_v<_Tp>; template<typename _Tp> concept unsigned_integral = integral<_Tp> && !signed_integral<_Tp>; template<typename _Tp> concept floating_point = is_floating_point_v<_Tp>; namespace __detail { template<typename _Tp> using __cref = const remove_reference_t<_Tp>&; template<typename _Tp> concept __class_or_enum = is_class_v<_Tp> || is_union_v<_Tp> || is_enum_v<_Tp>; } // namespace __detail /// [concept.assignable], concept assignable_from template<typename _Lhs, typename _Rhs> concept assignable_from = is_lvalue_reference_v<_Lhs> && common_reference_with<__detail::__cref<_Lhs>, __detail::__cref<_Rhs>> && requires(_Lhs __lhs, _Rhs&& __rhs) { { __lhs = static_cast<_Rhs&&>(__rhs) } -> same_as<_Lhs>; }; /// [concept.destructible], concept destructible template<typename _Tp> concept destructible = is_nothrow_destructible_v<_Tp>; /// [concept.constructible], concept constructible_from template<typename _Tp, typename... _Args> concept constructible_from = destructible<_Tp> && is_constructible_v<_Tp, _Args...>; /// [concept.defaultinitializable], concept default_initializable template<typename _Tp> concept default_initializable = constructible_from<_Tp> && requires { _Tp{}; (void) ::new _Tp; }; /// [concept.moveconstructible], concept move_constructible template<typename _Tp> concept move_constructible = constructible_from<_Tp, _Tp> && convertible_to<_Tp, _Tp>; /// [concept.copyconstructible], concept copy_constructible template<typename _Tp> concept copy_constructible = move_constructible<_Tp> && constructible_from<_Tp, _Tp&> && convertible_to<_Tp&, _Tp> && constructible_from<_Tp, const _Tp&> && convertible_to<const _Tp&, _Tp> && constructible_from<_Tp, const _Tp> && convertible_to<const _Tp, _Tp>; // [concept.swappable], concept swappable namespace ranges { namespace __cust_swap { template<typename _Tp> void swap(_Tp&, _Tp&) = delete; template<typename _Tp, typename _Up> concept __adl_swap = (__detail::__class_or_enum<remove_reference_t<_Tp>> || __detail::__class_or_enum<remove_reference_t<_Up>>) && requires(_Tp&& __t, _Up&& __u) { swap(static_cast<_Tp&&>(__t), static_cast<_Up&&>(__u)); }; struct _Swap { private: template<typename _Tp, typename _Up> static constexpr bool _S_noexcept() { if constexpr (__adl_swap<_Tp, _Up>) return noexcept(swap(std::declval<_Tp>(), std::declval<_Up>())); else return is_nothrow_move_constructible_v<remove_reference_t<_Tp>> && is_nothrow_move_assignable_v<remove_reference_t<_Tp>>; } public: template<typename _Tp, typename _Up> requires __adl_swap<_Tp, _Up> || (same_as<_Tp, _Up> && is_lvalue_reference_v<_Tp> && move_constructible<remove_reference_t<_Tp>> && assignable_from<_Tp, remove_reference_t<_Tp>>) constexpr void operator()(_Tp&& __t, _Up&& __u) const noexcept(_S_noexcept<_Tp, _Up>()) { if constexpr (__adl_swap<_Tp, _Up>) swap(static_cast<_Tp&&>(__t), static_cast<_Up&&>(__u)); else { auto __tmp = static_cast<remove_reference_t<_Tp>&&>(__t); __t = static_cast<remove_reference_t<_Tp>&&>(__u); __u = static_cast<remove_reference_t<_Tp>&&>(__tmp); } } template<typename _Tp, typename _Up, size_t _Num> requires requires(const _Swap& __swap, _Tp& __e1, _Up& __e2) { __swap(__e1, __e2); } constexpr void operator()(_Tp (&__e1)[_Num], _Up (&__e2)[_Num]) const noexcept(noexcept(std::declval<const _Swap&>()(*__e1, *__e2))) { for (size_t __n = 0; __n < _Num; ++__n) (*this)(__e1[__n], __e2[__n]); } }; } // namespace __cust_swap inline namespace __cust { inline constexpr __cust_swap::_Swap swap{}; } // inline namespace __cust } // namespace ranges template<typename _Tp> concept swappable = requires(_Tp& __a, _Tp& __b) { ranges::swap(__a, __b); }; template<typename _Tp, typename _Up> concept swappable_with = common_reference_with<_Tp, _Up> && requires(_Tp&& __t, _Up&& __u) { ranges::swap(static_cast<_Tp&&>(__t), static_cast<_Tp&&>(__t)); ranges::swap(static_cast<_Up&&>(__u), static_cast<_Up&&>(__u)); ranges::swap(static_cast<_Tp&&>(__t), static_cast<_Up&&>(__u)); ranges::swap(static_cast<_Up&&>(__u), static_cast<_Tp&&>(__t)); }; // [concepts.object], Object concepts template<typename _Tp> concept movable = is_object_v<_Tp> && move_constructible<_Tp> && assignable_from<_Tp&, _Tp> && swappable<_Tp>; template<typename _Tp> concept copyable = copy_constructible<_Tp> && movable<_Tp> && assignable_from<_Tp&, _Tp&> && assignable_from<_Tp&, const _Tp&> && assignable_from<_Tp&, const _Tp>; template<typename _Tp> concept semiregular = copyable<_Tp> && default_initializable<_Tp>; // [concepts.compare], comparison concepts // [concept.booleantestable], Boolean testability namespace __detail { template<typename _Tp> concept __boolean_testable_impl = convertible_to<_Tp, bool>; template<typename _Tp> concept __boolean_testable = __boolean_testable_impl<_Tp> && requires(_Tp&& __t) { { !static_cast<_Tp&&>(__t) } -> __boolean_testable_impl; }; } // namespace __detail // [concept.equalitycomparable], concept equality_comparable namespace __detail { template<typename _Tp, typename _Up> concept __weakly_eq_cmp_with = requires(__detail::__cref<_Tp> __t, __detail::__cref<_Up> __u) { { __t == __u } -> __boolean_testable; { __t != __u } -> __boolean_testable; { __u == __t } -> __boolean_testable; { __u != __t } -> __boolean_testable; }; } // namespace __detail template<typename _Tp> concept equality_comparable = __detail::__weakly_eq_cmp_with<_Tp, _Tp>; template<typename _Tp, typename _Up> concept equality_comparable_with = equality_comparable<_Tp> && equality_comparable<_Up> && common_reference_with<__detail::__cref<_Tp>, __detail::__cref<_Up>> && equality_comparable<common_reference_t<__detail::__cref<_Tp>, __detail::__cref<_Up>>> && __detail::__weakly_eq_cmp_with<_Tp, _Up>; namespace __detail { template<typename _Tp, typename _Up> concept __partially_ordered_with = requires(const remove_reference_t<_Tp>& __t, const remove_reference_t<_Up>& __u) { { __t < __u } -> __boolean_testable; { __t > __u } -> __boolean_testable; { __t <= __u } -> __boolean_testable; { __t >= __u } -> __boolean_testable; { __u < __t } -> __boolean_testable; { __u > __t } -> __boolean_testable; { __u <= __t } -> __boolean_testable; { __u >= __t } -> __boolean_testable; }; } // namespace __detail // [concept.totallyordered], concept totally_ordered template<typename _Tp> concept totally_ordered = equality_comparable<_Tp> && __detail::__partially_ordered_with<_Tp, _Tp>; template<typename _Tp, typename _Up> concept totally_ordered_with = totally_ordered<_Tp> && totally_ordered<_Up> && equality_comparable_with<_Tp, _Up> && totally_ordered<common_reference_t<__detail::__cref<_Tp>, __detail::__cref<_Up>>> && __detail::__partially_ordered_with<_Tp, _Up>; template<typename _Tp> concept regular = semiregular<_Tp> && equality_comparable<_Tp>; // [concepts.callable], callable concepts /// [concept.invocable], concept invocable template<typename _Fn, typename... _Args> concept invocable = is_invocable_v<_Fn, _Args...>; /// [concept.regularinvocable], concept regular_invocable template<typename _Fn, typename... _Args> concept regular_invocable = invocable<_Fn, _Args...>; /// [concept.predicate], concept predicate template<typename _Fn, typename... _Args> concept predicate = regular_invocable<_Fn, _Args...> && __detail::__boolean_testable<invoke_result_t<_Fn, _Args...>>; /// [concept.relation], concept relation template<typename _Rel, typename _Tp, typename _Up> concept relation = predicate<_Rel, _Tp, _Tp> && predicate<_Rel, _Up, _Up> && predicate<_Rel, _Tp, _Up> && predicate<_Rel, _Up, _Tp>; /// [concept.equiv], concept equivalence_relation template<typename _Rel, typename _Tp, typename _Up> concept equivalence_relation = relation<_Rel, _Tp, _Up>; /// [concept.strictweakorder], concept strict_weak_order template<typename _Rel, typename _Tp, typename _Up> concept strict_weak_order = relation<_Rel, _Tp, _Up>; _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif // C++2a #endif /* _GLIBCXX_CONCEPTS */