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 
28 template <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 
42 template <class _ForwardIterator, class _BinaryPredicate>
43 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
44 adjacent_find(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred) {
45   return std::__adjacent_find(std::move(__first), std::move(__last), __pred);
46 }
47 
48 template <class _ForwardIterator>
49 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
50 adjacent_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