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_FIRST_OF_H 10 #define _LIBCPP___ALGORITHM_RANGES_FIND_FIRST_OF_H 11 12 #include <__config> 13 #include <__functional/identity.h> 14 #include <__functional/invoke.h> 15 #include <__functional/ranges_operations.h> 16 #include <__iterator/concepts.h> 17 #include <__iterator/indirectly_comparable.h> 18 #include <__ranges/access.h> 19 #include <__ranges/concepts.h> 20 #include <__ranges/dangling.h> 21 #include <__utility/move.h> 22 23 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 24 # pragma GCC system_header 25 #endif 26 27 #if _LIBCPP_STD_VER >= 20 28 29 _LIBCPP_BEGIN_NAMESPACE_STD 30 31 namespace ranges { 32 namespace __find_first_of { 33 struct __fn { 34 template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Pred, class _Proj1, class _Proj2> 35 _LIBCPP_HIDE_FROM_ABI constexpr static _Iter1 __find_first_of_impl( 36 _Iter1 __first1, 37 _Sent1 __last1, 38 _Iter2 __first2, 39 _Sent2 __last2, 40 _Pred& __pred, 41 _Proj1& __proj1, 42 _Proj2& __proj2) { 43 for (; __first1 != __last1; ++__first1) { 44 for (auto __j = __first2; __j != __last2; ++__j) { 45 if (std::invoke(__pred, std::invoke(__proj1, *__first1), std::invoke(__proj2, *__j))) 46 return __first1; 47 } 48 } 49 return __first1; 50 } 51 52 template <input_iterator _Iter1, 53 sentinel_for<_Iter1> _Sent1, 54 forward_iterator _Iter2, 55 sentinel_for<_Iter2> _Sent2, 56 class _Pred = ranges::equal_to, 57 class _Proj1 = identity, 58 class _Proj2 = identity> 59 requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2> 60 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr _Iter1 operator()( 61 _Iter1 __first1, 62 _Sent1 __last1, 63 _Iter2 __first2, 64 _Sent2 __last2, 65 _Pred __pred = {}, 66 _Proj1 __proj1 = {}, 67 _Proj2 __proj2 = {}) const { 68 return __find_first_of_impl( 69 std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __pred, __proj1, __proj2); 70 } 71 72 template <input_range _Range1, 73 forward_range _Range2, 74 class _Pred = ranges::equal_to, 75 class _Proj1 = identity, 76 class _Proj2 = identity> 77 requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2> 78 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range1> operator()( 79 _Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const { 80 return __find_first_of_impl( 81 ranges::begin(__range1), 82 ranges::end(__range1), 83 ranges::begin(__range2), 84 ranges::end(__range2), 85 __pred, 86 __proj1, 87 __proj2); 88 } 89 }; 90 } // namespace __find_first_of 91 92 inline namespace __cpo { 93 inline constexpr auto find_first_of = __find_first_of::__fn{}; 94 } // namespace __cpo 95 } // namespace ranges 96 97 _LIBCPP_END_NAMESPACE_STD 98 99 #endif // _LIBCPP_STD_VER >= 20 100 101 #endif // _LIBCPP___ALGORITHM_RANGES_FIND_FIRST_OF_H 102