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 <__iterator/iterator_traits.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 _BinaryPredicate>
29_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Iter
30__adjacent_find(_Iter __first, _Sent __last, _BinaryPredicate&& __pred) {
31  if (__first == __last)
32    return __first;
33  _Iter __i = __first;
34  while (++__i != __last) {
35    if (__pred(*__first, *__i))
36      return __first;
37    __first = __i;
38  }
39  return __i;
40}
41
42template <class _ForwardIterator, class _BinaryPredicate>
43_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
44adjacent_find(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred) {
45  return std::__adjacent_find(std::move(__first), std::move(__last), __pred);
46}
47
48template <class _ForwardIterator>
49_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
50adjacent_find(_ForwardIterator __first, _ForwardIterator __last) {
51  return std::adjacent_find(std::move(__first), std::move(__last), __equal_to());
52}
53
54_LIBCPP_END_NAMESPACE_STD
55
56_LIBCPP_POP_MACROS
57
58#endif // _LIBCPP___ALGORITHM_ADJACENT_FIND_H
59