181ad6265SDimitry Andric //===----------------------------------------------------------------------===// 281ad6265SDimitry Andric // 381ad6265SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 481ad6265SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 581ad6265SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 681ad6265SDimitry Andric // 781ad6265SDimitry Andric //===----------------------------------------------------------------------===// 881ad6265SDimitry Andric 981ad6265SDimitry Andric #ifndef _LIBCPP___ALGORITHM_RANGES_ADJACENT_FIND_H 1081ad6265SDimitry Andric #define _LIBCPP___ALGORITHM_RANGES_ADJACENT_FIND_H 1181ad6265SDimitry Andric 1281ad6265SDimitry Andric #include <__config> 1381ad6265SDimitry Andric #include <__functional/identity.h> 1481ad6265SDimitry Andric #include <__functional/invoke.h> 1581ad6265SDimitry Andric #include <__functional/ranges_operations.h> 1681ad6265SDimitry Andric #include <__iterator/concepts.h> 1781ad6265SDimitry Andric #include <__iterator/projected.h> 1881ad6265SDimitry Andric #include <__ranges/access.h> 1981ad6265SDimitry Andric #include <__ranges/concepts.h> 2081ad6265SDimitry Andric #include <__ranges/dangling.h> 2181ad6265SDimitry Andric #include <__utility/move.h> 2281ad6265SDimitry Andric 2381ad6265SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 2481ad6265SDimitry Andric # pragma GCC system_header 2581ad6265SDimitry Andric #endif 2681ad6265SDimitry Andric 275f757f3fSDimitry Andric _LIBCPP_PUSH_MACROS 285f757f3fSDimitry Andric #include <__undef_macros> 295f757f3fSDimitry Andric 3006c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 20 3181ad6265SDimitry Andric 3281ad6265SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 3381ad6265SDimitry Andric 3481ad6265SDimitry Andric namespace ranges { 3581ad6265SDimitry Andric namespace __adjacent_find { 3681ad6265SDimitry Andric struct __fn { 3781ad6265SDimitry Andric template <class _Iter, class _Sent, class _Proj, class _Pred> 3806c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr static _Iter 3906c3fb27SDimitry Andric __adjacent_find_impl(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) { 4081ad6265SDimitry Andric if (__first == __last) 4181ad6265SDimitry Andric return __first; 4281ad6265SDimitry Andric 4381ad6265SDimitry Andric auto __i = __first; 4481ad6265SDimitry Andric while (++__i != __last) { 4581ad6265SDimitry Andric if (std::invoke(__pred, std::invoke(__proj, *__first), std::invoke(__proj, *__i))) 4681ad6265SDimitry Andric return __first; 4781ad6265SDimitry Andric __first = __i; 4881ad6265SDimitry Andric } 4981ad6265SDimitry Andric return __i; 5081ad6265SDimitry Andric } 5181ad6265SDimitry Andric 5206c3fb27SDimitry Andric template <forward_iterator _Iter, 5306c3fb27SDimitry Andric sentinel_for<_Iter> _Sent, 5481ad6265SDimitry Andric class _Proj = identity, 5581ad6265SDimitry Andric indirect_binary_predicate<projected<_Iter, _Proj>, projected<_Iter, _Proj>> _Pred = ranges::equal_to> 56*0fca6ea1SDimitry Andric [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Iter 5706c3fb27SDimitry Andric operator()(_Iter __first, _Sent __last, _Pred __pred = {}, _Proj __proj = {}) const { 5881ad6265SDimitry Andric return __adjacent_find_impl(std::move(__first), std::move(__last), __pred, __proj); 5981ad6265SDimitry Andric } 6081ad6265SDimitry Andric 6181ad6265SDimitry Andric template <forward_range _Range, 6281ad6265SDimitry Andric class _Proj = identity, 6306c3fb27SDimitry Andric indirect_binary_predicate<projected<iterator_t<_Range>, _Proj>, projected<iterator_t<_Range>, _Proj>> 6406c3fb27SDimitry Andric _Pred = ranges::equal_to> 65*0fca6ea1SDimitry Andric [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range> 6606c3fb27SDimitry Andric operator()(_Range&& __range, _Pred __pred = {}, _Proj __proj = {}) const { 6781ad6265SDimitry Andric return __adjacent_find_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj); 6881ad6265SDimitry Andric } 6981ad6265SDimitry Andric }; 7081ad6265SDimitry Andric } // namespace __adjacent_find 7181ad6265SDimitry Andric 7281ad6265SDimitry Andric inline namespace __cpo { 7381ad6265SDimitry Andric inline constexpr auto adjacent_find = __adjacent_find::__fn{}; 7481ad6265SDimitry Andric } // namespace __cpo 7581ad6265SDimitry Andric } // namespace ranges 7681ad6265SDimitry Andric 7781ad6265SDimitry Andric _LIBCPP_END_NAMESPACE_STD 7881ad6265SDimitry Andric 7906c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 20 8081ad6265SDimitry Andric 815f757f3fSDimitry Andric _LIBCPP_POP_MACROS 825f757f3fSDimitry Andric 8381ad6265SDimitry Andric #endif // _LIBCPP___ALGORITHM_RANGES_ADJACENT_FIND_H 84