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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_FIND_H
0010 #define _LIBCPP___ALGORITHM_RANGES_FIND_H
0011 
0012 #include <__algorithm/find.h>
0013 #include <__algorithm/ranges_find_if.h>
0014 #include <__algorithm/unwrap_range.h>
0015 #include <__config>
0016 #include <__functional/identity.h>
0017 #include <__functional/invoke.h>
0018 #include <__functional/ranges_operations.h>
0019 #include <__iterator/concepts.h>
0020 #include <__iterator/projected.h>
0021 #include <__ranges/access.h>
0022 #include <__ranges/concepts.h>
0023 #include <__ranges/dangling.h>
0024 #include <__utility/forward.h>
0025 #include <__utility/move.h>
0026 
0027 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0028 #  pragma GCC system_header
0029 #endif
0030 
0031 _LIBCPP_PUSH_MACROS
0032 #include <__undef_macros>
0033 
0034 #if _LIBCPP_STD_VER >= 20
0035 
0036 _LIBCPP_BEGIN_NAMESPACE_STD
0037 
0038 namespace ranges {
0039 struct __find {
0040   template <class _Iter, class _Sent, class _Tp, class _Proj>
0041   _LIBCPP_HIDE_FROM_ABI static constexpr _Iter
0042   __find_unwrap(_Iter __first, _Sent __last, const _Tp& __value, _Proj& __proj) {
0043     if constexpr (forward_iterator<_Iter>) {
0044       auto [__first_un, __last_un] = std::__unwrap_range(__first, std::move(__last));
0045       return std::__rewrap_range<_Sent>(
0046           std::move(__first), std::__find(std::move(__first_un), std::move(__last_un), __value, __proj));
0047     } else {
0048       return std::__find(std::move(__first), std::move(__last), __value, __proj);
0049     }
0050   }
0051 
0052   template <input_iterator _Ip, sentinel_for<_Ip> _Sp, class _Tp, class _Proj = identity>
0053     requires indirect_binary_predicate<ranges::equal_to, projected<_Ip, _Proj>, const _Tp*>
0054   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Ip
0055   operator()(_Ip __first, _Sp __last, const _Tp& __value, _Proj __proj = {}) const {
0056     return __find_unwrap(std::move(__first), std::move(__last), __value, __proj);
0057   }
0058 
0059   template <input_range _Rp, class _Tp, class _Proj = identity>
0060     requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Rp>, _Proj>, const _Tp*>
0061   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Rp>
0062   operator()(_Rp&& __r, const _Tp& __value, _Proj __proj = {}) const {
0063     return __find_unwrap(ranges::begin(__r), ranges::end(__r), __value, __proj);
0064   }
0065 };
0066 
0067 inline namespace __cpo {
0068 inline constexpr auto find = __find{};
0069 } // namespace __cpo
0070 } // namespace ranges
0071 
0072 _LIBCPP_END_NAMESPACE_STD
0073 
0074 #endif // _LIBCPP_STD_VER >= 20
0075 
0076 _LIBCPP_POP_MACROS
0077 
0078 #endif // _LIBCPP___ALGORITHM_RANGES_FIND_H