1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___ALGORITHM_ADJACENT_FIND_H 11 #define _LIBCPP___ALGORITHM_ADJACENT_FIND_H 12 13 #include <__algorithm/comp.h> 14 #include <__algorithm/iterator_operations.h> 15 #include <__config> 16 #include <__functional/identity.h> 17 #include <__iterator/iterator_traits.h> 18 #include <__type_traits/invoke.h> 19 #include <__utility/move.h> 20 21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 22 # pragma GCC system_header 23 #endif 24 25 _LIBCPP_PUSH_MACROS 26 #include <__undef_macros> 27 28 _LIBCPP_BEGIN_NAMESPACE_STD 29 30 template <class _Iter, class _Sent, class _Pred, class _Proj> 31 [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Iter 32 __adjacent_find(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) { 33 if (__first == __last) 34 return __first; 35 36 _Iter __i = __first; 37 while (++__i != __last) { 38 if (std::__invoke(__pred, std::__invoke(__proj, *__first), std::__invoke(__proj, *__i))) 39 return __first; 40 __first = __i; 41 } 42 return __i; 43 } 44 45 template <class _ForwardIterator, class _BinaryPredicate> 46 [[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator 47 adjacent_find(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred) { 48 __identity __proj; 49 return std::__adjacent_find(std::move(__first), std::move(__last), __pred, __proj); 50 } 51 52 template <class _ForwardIterator> 53 [[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator 54 adjacent_find(_ForwardIterator __first, _ForwardIterator __last) { 55 return std::adjacent_find(std::move(__first), std::move(__last), __equal_to()); 56 } 57 58 _LIBCPP_END_NAMESPACE_STD 59 60 _LIBCPP_POP_MACROS 61 62 #endif // _LIBCPP___ALGORITHM_ADJACENT_FIND_H 63