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 > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) 28 29 _LIBCPP_BEGIN_NAMESPACE_STD 30 31 namespace ranges { 32 namespace __find_first_of { 33 struct __fn { 34 35 template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Pred, class _Proj1, class _Proj2> 36 _LIBCPP_HIDE_FROM_ABI constexpr static 37 _Iter1 __find_first_of_impl(_Iter1 __first1, _Sent1 __last1, 38 _Iter2 __first2, _Sent2 __last2, 39 _Pred& __pred, 40 _Proj1& __proj1, 41 _Proj2& __proj2) { 42 for (; __first1 != __last1; ++__first1) { 43 for (auto __j = __first2; __j != __last2; ++__j) { 44 if (std::invoke(__pred, std::invoke(__proj1, *__first1), std::invoke(__proj2, *__j))) 45 return __first1; 46 } 47 } 48 return __first1; 49 } 50 51 template <input_iterator _Iter1, sentinel_for<_Iter1> _Sent1, 52 forward_iterator _Iter2, sentinel_for<_Iter2> _Sent2, 53 class _Pred = ranges::equal_to, 54 class _Proj1 = identity, 55 class _Proj2 = identity> 56 requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2> 57 _LIBCPP_HIDE_FROM_ABI constexpr 58 _Iter1 operator()(_Iter1 __first1, _Sent1 __last1, 59 _Iter2 __first2, _Sent2 __last2, 60 _Pred __pred = {}, 61 _Proj1 __proj1 = {}, 62 _Proj2 __proj2 = {}) const { 63 return __find_first_of_impl(std::move(__first1), std::move(__last1), 64 std::move(__first2), std::move(__last2), 65 __pred, 66 __proj1, 67 __proj2); 68 } 69 70 template <input_range _Range1, 71 forward_range _Range2, 72 class _Pred = ranges::equal_to, 73 class _Proj1 = identity, 74 class _Proj2 = identity> 75 requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2> 76 _LIBCPP_HIDE_FROM_ABI constexpr 77 borrowed_iterator_t<_Range1> operator()(_Range1&& __range1, 78 _Range2&& __range2, 79 _Pred __pred = {}, 80 _Proj1 __proj1 = {}, 81 _Proj2 __proj2 = {}) const { 82 return __find_first_of_impl(ranges::begin(__range1), ranges::end(__range1), 83 ranges::begin(__range2), ranges::end(__range2), 84 __pred, 85 __proj1, 86 __proj2); 87 } 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 > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) 100 101 #endif // _LIBCPP___ALGORITHM_RANGES_FIND_FIRST_OF_H 102