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1// -*- C++ -*-2//===----------------------------------------------------------------------===//3//4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.5// See https://llvm.org/LICENSE.txt for license information.6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception7//8//===----------------------------------------------------------------------===//9 10#ifndef _LIBCPP___RANGES_CONCEPTS_H11#define _LIBCPP___RANGES_CONCEPTS_H12 13#include <__concepts/common_reference_with.h>14#include <__concepts/constructible.h>15#include <__concepts/convertible_to.h>16#include <__concepts/movable.h>17#include <__concepts/same_as.h>18#include <__config>19#include <__iterator/concepts.h>20#include <__iterator/incrementable_traits.h>21#include <__iterator/iter_move.h>22#include <__iterator/iterator_traits.h>23#include <__iterator/readable_traits.h>24#include <__ranges/access.h>25#include <__ranges/data.h>26#include <__ranges/enable_borrowed_range.h>27#include <__ranges/enable_view.h>28#include <__ranges/size.h>29#include <__type_traits/add_pointer.h>30#include <__type_traits/common_reference.h>31#include <__type_traits/common_type.h>32#include <__type_traits/is_reference.h>33#include <__type_traits/remove_cvref.h>34#include <__type_traits/remove_reference.h>35#include <__utility/declval.h>36#include <initializer_list>37 38#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)39# pragma GCC system_header40#endif41 42_LIBCPP_BEGIN_NAMESPACE_STD43 44#if _LIBCPP_STD_VER >= 2045 46namespace ranges {47 48// [range.range]49 50template <class _Tp>51concept range = requires(_Tp& __t) {52 ranges::begin(__t); // sometimes equality-preserving53 ranges::end(__t);54};55 56template <class _Tp>57concept input_range = range<_Tp> && input_iterator<iterator_t<_Tp>>;58 59template <class _Range>60concept borrowed_range =61 range<_Range> && (is_lvalue_reference_v<_Range> || enable_borrowed_range<remove_cvref_t<_Range>>);62 63// `iterator_t` defined in <__ranges/access.h>64 65template <range _Rp>66using sentinel_t = decltype(ranges::end(std::declval<_Rp&>()));67 68template <range _Rp>69using range_difference_t = iter_difference_t<iterator_t<_Rp>>;70 71template <range _Rp>72using range_value_t = iter_value_t<iterator_t<_Rp>>;73 74template <range _Rp>75using range_reference_t = iter_reference_t<iterator_t<_Rp>>;76 77template <range _Rp>78using range_rvalue_reference_t = iter_rvalue_reference_t<iterator_t<_Rp>>;79 80template <range _Rp>81using range_common_reference_t = iter_common_reference_t<iterator_t<_Rp>>;82 83// [range.sized]84template <class _Tp>85concept sized_range = range<_Tp> && requires(_Tp& __t) { ranges::size(__t); };86 87template <sized_range _Rp>88using range_size_t = decltype(ranges::size(std::declval<_Rp&>()));89 90// `disable_sized_range` defined in `<__ranges/size.h>`91 92// [range.view], views93 94// `enable_view` defined in <__ranges/enable_view.h>95// `view_base` defined in <__ranges/enable_view.h>96 97template <class _Tp>98concept view = range<_Tp> && movable<_Tp> && enable_view<_Tp>;99 100template <class _Range>101concept __simple_view =102 view<_Range> && range<const _Range> && same_as<iterator_t<_Range>, iterator_t<const _Range>> &&103 same_as<sentinel_t<_Range>, sentinel_t<const _Range>>;104 105// [range.refinements], other range refinements106template <class _Rp, class _Tp>107concept output_range = range<_Rp> && output_iterator<iterator_t<_Rp>, _Tp>;108 109template <class _Tp>110concept forward_range = input_range<_Tp> && forward_iterator<iterator_t<_Tp>>;111 112template <class _Tp>113concept bidirectional_range = forward_range<_Tp> && bidirectional_iterator<iterator_t<_Tp>>;114 115template <class _Tp>116concept random_access_range = bidirectional_range<_Tp> && random_access_iterator<iterator_t<_Tp>>;117 118template <class _Tp>119concept contiguous_range = random_access_range<_Tp> && contiguous_iterator<iterator_t<_Tp>> && requires(_Tp& __t) {120 { ranges::data(__t) } -> same_as<add_pointer_t<range_reference_t<_Tp>>>;121};122 123template <class _Tp>124concept common_range = range<_Tp> && same_as<iterator_t<_Tp>, sentinel_t<_Tp>>;125 126template <class _Tp>127inline constexpr bool __is_std_initializer_list = false;128 129template <class _Ep>130inline constexpr bool __is_std_initializer_list<initializer_list<_Ep>> = true;131 132template <class _Tp>133concept viewable_range =134 range<_Tp> &&135 ((view<remove_cvref_t<_Tp>> && constructible_from<remove_cvref_t<_Tp>, _Tp>) ||136 (!view<remove_cvref_t<_Tp>> &&137 (is_lvalue_reference_v<_Tp> ||138 (movable<remove_reference_t<_Tp>> && !__is_std_initializer_list<remove_cvref_t<_Tp>>))));139 140# if _LIBCPP_STD_VER >= 23141 142template <class... _Rs>143using __concat_reference_t _LIBCPP_NODEBUG = common_reference_t<range_reference_t<_Rs>...>;144 145template <class... _Rs>146using __concat_value_t _LIBCPP_NODEBUG = common_type_t<range_value_t<_Rs>...>;147 148template <class... _Rs>149using __concat_rvalue_reference_t _LIBCPP_NODEBUG = common_reference_t<range_rvalue_reference_t<_Rs>...>;150 151template <class _Ref, class _RRef, class _It>152concept __concat_indirectly_readable_impl = requires(const _It __it) {153 { *__it } -> convertible_to<_Ref>;154 { ranges::iter_move(__it) } -> convertible_to<_RRef>;155};156 157template <class... _Rs>158concept __concat_indirectly_readable =159 common_reference_with<__concat_reference_t<_Rs...>&&, __concat_value_t<_Rs...>&> &&160 common_reference_with<__concat_reference_t<_Rs...>&&, __concat_rvalue_reference_t<_Rs...>&&> &&161 common_reference_with<__concat_rvalue_reference_t<_Rs...>&&, const __concat_value_t<_Rs...>&> &&162 (__concat_indirectly_readable_impl<__concat_reference_t<_Rs...>,163 __concat_rvalue_reference_t<_Rs...>,164 iterator_t<_Rs>> &&165 ...);166 167template <class... _Rs>168concept __concatable = requires {169 typename __concat_reference_t<_Rs...>;170 typename __concat_value_t<_Rs...>;171 typename __concat_rvalue_reference_t<_Rs...>;172} && __concat_indirectly_readable<_Rs...>;173 174# endif // _LIBCPP_STD_VER >= 23175 176} // namespace ranges177 178#endif // _LIBCPP_STD_VER >= 20179 180_LIBCPP_END_NAMESPACE_STD181 182#endif // _LIBCPP___RANGES_CONCEPTS_H183