libcxx/include/__algorithm/ranges_contains.h

   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-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef _LIBCPP___ALGORITHM_RANGES_CONTAINS_H
  10 #define _LIBCPP___ALGORITHM_RANGES_CONTAINS_H
  11
  12 #include <__algorithm/ranges_find.h>
  13 #include <__config>
  14 #include <__functional/identity.h>
  15 #include <__functional/ranges_operations.h>
  16 #include <__functional/reference_wrapper.h>
  17 #include <__iterator/concepts.h>
  18 #include <__iterator/indirectly_comparable.h>
  19 #include <__iterator/projected.h>
  20 #include <__ranges/access.h>
  21 #include <__ranges/concepts.h>
  22 #include <__utility/move.h>
  23
  24 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  25 #  pragma GCC system_header
  26 #endif
  27
  28 _LIBCPP_PUSH_MACROS
  29 #include <__undef_macros>
  30
  31 #if _LIBCPP_STD_VER >= 23
  32
  33 _LIBCPP_BEGIN_NAMESPACE_STD
  34
  35 namespace ranges {
  36 struct __contains {
  37   template <input_iterator _Iter, sentinel_for<_Iter> _Sent, class _Type, class _Proj = identity>
  38     requires indirect_binary_predicate<ranges::equal_to, projected<_Iter, _Proj>, const _Type*>
  39   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool static
  40   operator()(_Iter __first, _Sent __last, const _Type& __value, _Proj __proj = {}) {
  41     return ranges::find(std::move(__first), __last, __value, std::ref(__proj)) != __last;
  42   }
  43
  44   template <input_range _Range, class _Type, class _Proj = identity>
  45     requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Range>, _Proj>, const _Type*>
  46   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool static
  47   operator()(_Range&& __range, const _Type& __value, _Proj __proj = {}) {
  48     return ranges::find(ranges::begin(__range), ranges::end(__range), __value, std::ref(__proj)) !=
  49            ranges::end(__range);
  50   }
  51 };
  52
  53 inline namespace __cpo {
  54 inline constexpr auto contains = __contains{};
  55 } // namespace __cpo
  56 } // namespace ranges
  57
  58 _LIBCPP_END_NAMESPACE_STD
  59
  60 #endif // _LIBCPP_STD_VER >= 23
  61
  62 _LIBCPP_POP_MACROS
  63
  64 #endif // _LIBCPP___ALGORITHM_RANGES_CONTAINS_H