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