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_FIND_H 10 #define _LIBCPP___ALGORITHM_RANGES_FIND_H 11 12 #include <__algorithm/find.h> 13 #include <__algorithm/ranges_find_if.h> 14 #include <__algorithm/unwrap_range.h> 15 #include <__config> 16 #include <__functional/identity.h> 17 #include <__functional/invoke.h> 18 #include <__functional/ranges_operations.h> 19 #include <__iterator/concepts.h> 20 #include <__iterator/projected.h> 21 #include <__ranges/access.h> 22 #include <__ranges/concepts.h> 23 #include <__ranges/dangling.h> 24 #include <__utility/forward.h> 25 #include <__utility/move.h> 26 27 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 28 # pragma GCC system_header 29 #endif 30 31 #if _LIBCPP_STD_VER >= 20 32 33 _LIBCPP_BEGIN_NAMESPACE_STD 34 35 namespace ranges { 36 namespace __find { 37 struct __fn { 38 template <class _Iter, class _Sent, class _Tp, class _Proj> 39 _LIBCPP_HIDE_FROM_ABI static constexpr _Iter 40 __find_unwrap(_Iter __first, _Sent __last, const _Tp& __value, _Proj& __proj) { 41 if constexpr (forward_iterator<_Iter>) { 42 auto [__first_un, __last_un] = std::__unwrap_range(__first, std::move(__last)); 43 return std::__rewrap_range<_Sent>( 44 std::move(__first), std::__find_impl(std::move(__first_un), std::move(__last_un), __value, __proj)); 45 } else { 46 return std::__find_impl(std::move(__first), std::move(__last), __value, __proj); 47 } 48 } 49 50 template <input_iterator _Ip, sentinel_for<_Ip> _Sp, class _Tp, class _Proj = identity> 51 requires indirect_binary_predicate<ranges::equal_to, projected<_Ip, _Proj>, const _Tp*> 52 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr _Ip 53 operator()(_Ip __first, _Sp __last, const _Tp& __value, _Proj __proj = {}) const { 54 return __find_unwrap(std::move(__first), std::move(__last), __value, __proj); 55 } 56 57 template <input_range _Rp, class _Tp, class _Proj = identity> 58 requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Rp>, _Proj>, const _Tp*> 59 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Rp> 60 operator()(_Rp&& __r, const _Tp& __value, _Proj __proj = {}) const { 61 return __find_unwrap(ranges::begin(__r), ranges::end(__r), __value, __proj); 62 } 63 }; 64 } // namespace __find 65 66 inline namespace __cpo { 67 inline constexpr auto find = __find::__fn{}; 68 } // namespace __cpo 69 } // namespace ranges 70 71 _LIBCPP_END_NAMESPACE_STD 72 73 #endif // _LIBCPP_STD_VER >= 20 74 75 #endif // _LIBCPP___ALGORITHM_RANGES_FIND_H 76