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 _LIBCPP_PUSH_MACROS 32 #include <__undef_macros> 33 34 #if _LIBCPP_STD_VER >= 20 35 36 _LIBCPP_BEGIN_NAMESPACE_STD 37 38 namespace ranges { 39 namespace __find { 40 struct __fn { 41 template <class _Iter, class _Sent, class _Tp, class _Proj> 42 _LIBCPP_HIDE_FROM_ABI static constexpr _Iter __find_unwrap__fn43 __find_unwrap(_Iter __first, _Sent __last, const _Tp& __value, _Proj& __proj) { 44 if constexpr (forward_iterator<_Iter>) { 45 auto [__first_un, __last_un] = std::__unwrap_range(__first, std::move(__last)); 46 return std::__rewrap_range<_Sent>( 47 std::move(__first), std::__find(std::move(__first_un), std::move(__last_un), __value, __proj)); 48 } else { 49 return std::__find(std::move(__first), std::move(__last), __value, __proj); 50 } 51 } 52 53 template <input_iterator _Ip, sentinel_for<_Ip> _Sp, class _Tp, class _Proj = identity> 54 requires indirect_binary_predicate<ranges::equal_to, projected<_Ip, _Proj>, const _Tp*> 55 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Ip operator__fn56 operator()(_Ip __first, _Sp __last, const _Tp& __value, _Proj __proj = {}) const { 57 return __find_unwrap(std::move(__first), std::move(__last), __value, __proj); 58 } 59 60 template <input_range _Rp, class _Tp, class _Proj = identity> 61 requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Rp>, _Proj>, const _Tp*> 62 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Rp> operator__fn63 operator()(_Rp&& __r, const _Tp& __value, _Proj __proj = {}) const { 64 return __find_unwrap(ranges::begin(__r), ranges::end(__r), __value, __proj); 65 } 66 }; 67 } // namespace __find 68 69 inline namespace __cpo { 70 inline constexpr auto find = __find::__fn{}; 71 } // namespace __cpo 72 } // namespace ranges 73 74 _LIBCPP_END_NAMESPACE_STD 75 76 #endif // _LIBCPP_STD_VER >= 20 77 78 _LIBCPP_POP_MACROS 79 80 #endif // _LIBCPP___ALGORITHM_RANGES_FIND_H 81