v1/__algorithm/ranges_contains.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___ALGORITHM_RANGES_CONTAINS_H
0010 #define _LIBCPP___ALGORITHM_RANGES_CONTAINS_H
0011
0012 #include <__algorithm/ranges_find.h>
0013 #include <__config>
0014 #include <__functional/identity.h>
0015 #include <__functional/ranges_operations.h>
0016 #include <__functional/reference_wrapper.h>
0017 #include <__iterator/concepts.h>
0018 #include <__iterator/indirectly_comparable.h>
0019 #include <__iterator/projected.h>
0020 #include <__ranges/access.h>
0021 #include <__ranges/concepts.h>
0022 #include <__utility/move.h>
0023
0024 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0025 #  pragma GCC system_header
0026 #endif
0027
0028 _LIBCPP_PUSH_MACROS
0029 #include <__undef_macros>
0030
0031 #if _LIBCPP_STD_VER >= 23
0032
0033 _LIBCPP_BEGIN_NAMESPACE_STD
0034
0035 namespace ranges {
0036 struct __contains {
0037   template <input_iterator _Iter, sentinel_for<_Iter> _Sent, class _Type, class _Proj = identity>
0038     requires indirect_binary_predicate<ranges::equal_to, projected<_Iter, _Proj>, const _Type*>
0039   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool static
0040   operator()(_Iter __first, _Sent __last, const _Type& __value, _Proj __proj = {}) {
0041     return ranges::find(std::move(__first), __last, __value, std::ref(__proj)) != __last;
0042   }
0043
0044   template <input_range _Range, class _Type, class _Proj = identity>
0045     requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Range>, _Proj>, const _Type*>
0046   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool static
0047   operator()(_Range&& __range, const _Type& __value, _Proj __proj = {}) {
0048     return ranges::find(ranges::begin(__range), ranges::end(__range), __value, std::ref(__proj)) !=
0049            ranges::end(__range);
0050   }
0051 };
0052
0053 inline namespace __cpo {
0054 inline constexpr auto contains = __contains{};
0055 } // namespace __cpo
0056 } // namespace ranges
0057
0058 _LIBCPP_END_NAMESPACE_STD
0059
0060 #endif // _LIBCPP_STD_VER >= 23
0061
0062 _LIBCPP_POP_MACROS
0063
0064 #endif // _LIBCPP___ALGORITHM_RANGES_CONTAINS_H