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1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef _LIBCPP___ITERATOR_CPP17_ITERATOR_CONCEPTS_H10#define _LIBCPP___ITERATOR_CPP17_ITERATOR_CONCEPTS_H11 12#include <__concepts/boolean_testable.h>13#include <__concepts/convertible_to.h>14#include <__concepts/same_as.h>15#include <__config>16#include <__iterator/iterator_traits.h>17#include <__type_traits/is_constructible.h>18#include <__type_traits/is_convertible.h>19#include <__type_traits/is_signed.h>20#include <__type_traits/is_void.h>21#include <__utility/as_const.h>22#include <__utility/forward.h>23#include <__utility/move.h>24#include <__utility/swap.h>25 26#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)27# pragma GCC system_header28#endif29 30_LIBCPP_PUSH_MACROS31#include <__undef_macros>32 33#if _LIBCPP_STD_VER >= 2034 35_LIBCPP_BEGIN_NAMESPACE_STD36 37template <class _Tp>38concept __cpp17_move_constructible = is_move_constructible_v<_Tp>;39 40template <class _Tp>41concept __cpp17_copy_constructible = __cpp17_move_constructible<_Tp> && is_copy_constructible_v<_Tp>;42 43template <class _Tp>44concept __cpp17_move_assignable = requires(_Tp __lhs, _Tp __rhs) {45 { __lhs = std::move(__rhs) } -> same_as<_Tp&>;46};47 48template <class _Tp>49concept __cpp17_copy_assignable = __cpp17_move_assignable<_Tp> && requires(_Tp __lhs, _Tp __rhs) {50 { __lhs = __rhs } -> same_as<_Tp&>;51 { __lhs = std::as_const(__rhs) } -> same_as<_Tp&>;52};53 54template <class _Tp>55concept __cpp17_destructible = requires(_Tp __v) { __v.~_Tp(); };56 57template <class _Tp>58concept __cpp17_equality_comparable = requires(_Tp __lhs, _Tp __rhs) {59 { __lhs == __rhs } -> __boolean_testable;60 { std::as_const(__lhs) == __rhs } -> __boolean_testable;61 { __lhs == std::as_const(__rhs) } -> __boolean_testable;62 { std::as_const(__lhs) == std::as_const(__rhs) } -> __boolean_testable;63};64 65template <class _Tp>66concept __cpp17_default_constructible = is_default_constructible_v<_Tp>;67 68template <class _Iter>69concept __cpp17_iterator =70 __cpp17_copy_constructible<_Iter> && __cpp17_copy_assignable<_Iter> && __cpp17_destructible<_Iter> &&71 (is_signed_v<__iterator_difference_type<_Iter>> || is_void_v<__iterator_difference_type<_Iter>>) &&72 requires(_Iter __iter) {73 { *__iter };74 { ++__iter } -> same_as<_Iter&>;75 };76 77template <class _Iter>78concept __cpp17_input_iterator =79 __cpp17_iterator<_Iter> && __cpp17_equality_comparable<_Iter> && requires(_Iter __lhs, _Iter __rhs) {80 { __lhs != __rhs } -> __boolean_testable;81 { std::as_const(__lhs) != __rhs } -> __boolean_testable;82 { __lhs != std::as_const(__rhs) } -> __boolean_testable;83 { std::as_const(__lhs) != std::as_const(__rhs) } -> __boolean_testable;84 85 { *__lhs } -> same_as<__iterator_reference<_Iter>>;86 { *std::as_const(__lhs) } -> same_as<__iterator_reference<_Iter>>;87 88 { ++__lhs } -> same_as<_Iter&>;89 { (void)__lhs++ };90 { *__lhs++ };91 };92 93template <class _Iter, class _WriteTo>94concept __cpp17_output_iterator = __cpp17_iterator<_Iter> && requires(_Iter __iter, _WriteTo __write) {95 { *__iter = std::forward<_WriteTo>(__write) };96 { ++__iter } -> same_as<_Iter&>;97 { __iter++ } -> convertible_to<const _Iter&>;98 { *__iter++ = std::forward<_WriteTo>(__write) };99};100 101template <class _Iter>102concept __cpp17_forward_iterator =103 __cpp17_input_iterator<_Iter> && __cpp17_default_constructible<_Iter> && requires(_Iter __iter) {104 { __iter++ } -> convertible_to<const _Iter&>;105 { *__iter++ } -> same_as<__iterator_reference<_Iter>>;106 };107 108template <class _Iter>109concept __cpp17_bidirectional_iterator = __cpp17_forward_iterator<_Iter> && requires(_Iter __iter) {110 { --__iter } -> same_as<_Iter&>;111 { __iter-- } -> convertible_to<const _Iter&>;112 { *__iter-- } -> same_as<__iterator_reference<_Iter>>;113};114 115template <class _Iter>116concept __cpp17_random_access_iterator =117 __cpp17_bidirectional_iterator<_Iter> && requires(_Iter __iter, __iterator_difference_type<_Iter> __n) {118 { __iter += __n } -> same_as<_Iter&>;119 120 { __iter + __n } -> same_as<_Iter>;121 { __n + __iter } -> same_as<_Iter>;122 { std::as_const(__iter) + __n } -> same_as<_Iter>;123 { __n + std::as_const(__iter) } -> same_as<_Iter>;124 125 { __iter -= __n } -> same_as<_Iter&>;126 { __iter - __n } -> same_as<_Iter>;127 { std::as_const(__iter) - __n } -> same_as<_Iter>;128 129 { __iter - __iter } -> same_as<__iterator_difference_type<_Iter>>;130 { std::as_const(__iter) - __iter } -> same_as<__iterator_difference_type<_Iter>>;131 { __iter - std::as_const(__iter) } -> same_as<__iterator_difference_type<_Iter>>;132 { std::as_const(__iter) - std::as_const(__iter) } -> same_as<__iterator_difference_type<_Iter>>;133 134 { __iter[__n] } -> convertible_to<__iterator_reference<_Iter>>;135 { std::as_const(__iter)[__n] } -> convertible_to<__iterator_reference<_Iter>>;136 137 { __iter < __iter } -> __boolean_testable;138 { std::as_const(__iter) < __iter } -> __boolean_testable;139 { __iter < std::as_const(__iter) } -> __boolean_testable;140 { std::as_const(__iter) < std::as_const(__iter) } -> __boolean_testable;141 142 { __iter > __iter } -> __boolean_testable;143 { std::as_const(__iter) > __iter } -> __boolean_testable;144 { __iter > std::as_const(__iter) } -> __boolean_testable;145 { std::as_const(__iter) > std::as_const(__iter) } -> __boolean_testable;146 147 { __iter >= __iter } -> __boolean_testable;148 { std::as_const(__iter) >= __iter } -> __boolean_testable;149 { __iter >= std::as_const(__iter) } -> __boolean_testable;150 { std::as_const(__iter) >= std::as_const(__iter) } -> __boolean_testable;151 152 { __iter <= __iter } -> __boolean_testable;153 { std::as_const(__iter) <= __iter } -> __boolean_testable;154 { __iter <= std::as_const(__iter) } -> __boolean_testable;155 { std::as_const(__iter) <= std::as_const(__iter) } -> __boolean_testable;156 };157 158_LIBCPP_END_NAMESPACE_STD159 160# ifndef _LIBCPP_DISABLE_ITERATOR_CHECKS161# define _LIBCPP_REQUIRE_CPP17_INPUT_ITERATOR(iter_t, message) \162 static_assert(::std::__cpp17_input_iterator<iter_t>, message)163# define _LIBCPP_REQUIRE_CPP17_OUTPUT_ITERATOR(iter_t, write_t, message) \164 static_assert(::std::__cpp17_output_iterator<iter_t, write_t>, message)165# define _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(iter_t, message) \166 static_assert(::std::__cpp17_forward_iterator<iter_t>, message)167# define _LIBCPP_REQUIRE_CPP17_BIDIRECTIONAL_ITERATOR(iter_t, message) \168 static_assert(::std::__cpp17_bidirectional_iterator<iter_t>, message)169# define _LIBCPP_REQUIRE_CPP17_RANDOM_ACCESS_ITERATOR(iter_t, message) \170 static_assert(::std::__cpp17_random_access_iterator<iter_t>, message)171# else172# define _LIBCPP_REQUIRE_CPP17_INPUT_ITERATOR(iter_t, message) static_assert(true)173# define _LIBCPP_REQUIRE_CPP17_OUTPUT_ITERATOR(iter_t, write_t, message) static_assert(true)174# define _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(iter_t, message) static_assert(true)175# define _LIBCPP_REQUIRE_CPP17_BIDIRECTIONAL_ITERATOR(iter_t, message) static_assert(true)176# define _LIBCPP_REQUIRE_CPP17_RANDOM_ACCESS_ITERATOR(iter_t, message) static_assert(true)177# endif178 179#else // _LIBCPP_STD_VER >= 20180 181# define _LIBCPP_REQUIRE_CPP17_INPUT_ITERATOR(iter_t, message) static_assert(true)182# define _LIBCPP_REQUIRE_CPP17_OUTPUT_ITERATOR(iter_t, write_t, message) static_assert(true)183# define _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(iter_t, message) static_assert(true)184# define _LIBCPP_REQUIRE_CPP17_BIDIRECTIONAL_ITERATOR(iter_t, message) static_assert(true)185# define _LIBCPP_REQUIRE_CPP17_RANDOM_ACCESS_ITERATOR(iter_t, message) static_assert(true)186 187#endif // _LIBCPP_STD_VER >= 20188 189_LIBCPP_POP_MACROS190 191#endif // _LIBCPP___ITERATOR_CPP17_ITERATOR_CONCEPTS_H192