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 <__config>
15#include <__functional/identity.h>
16#include <__type_traits/invoke.h>
17#include <__utility/move.h>
18
19#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
20# pragma GCC system_header
21#endif
22
23_LIBCPP_PUSH_MACROS
24#include <__undef_macros>
25
26_LIBCPP_BEGIN_NAMESPACE_STD
27
28template <class _Iter, class _Sent, class _Pred, class _Proj>
29[[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Iter
30__adjacent_find(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) {
31 if (__first == __last)
32 return __first;
33
34 _Iter __i = __first;
35 while (++__i != __last) {
36 if (std::__invoke(__pred, std::__invoke(__proj, *__first), std::__invoke(__proj, *__i)))
37 return __first;
38 __first = __i;
39 }
40 return __i;
41}
42
43template <class _ForwardIterator, class _BinaryPredicate>
44[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
45adjacent_find(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred) {
46 __identity __proj;
47 return std::__adjacent_find(std::move(__first), std::move(__last), __pred, __proj);
48}
49
50template <class _ForwardIterator>
51[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
52adjacent_find(_ForwardIterator __first, _ForwardIterator __last) {
53 return std::adjacent_find(std::move(__first), std::move(__last), __equal_to());
54}
55
56_LIBCPP_END_NAMESPACE_STD
57
58_LIBCPP_POP_MACROS
59
60#endif // _LIBCPP___ALGORITHM_ADJACENT_FIND_H
61