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 <__config>
14 #include <__algorithm/comp.h>
15 #include <__iterator/iterator_traits.h>
16
17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18 #pragma GCC system_header
19 #endif
20
21 _LIBCPP_PUSH_MACROS
22 #include <__undef_macros>
23
24 _LIBCPP_BEGIN_NAMESPACE_STD
25
26 template <class _ForwardIterator, class _BinaryPredicate>
27 _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator
adjacent_find(_ForwardIterator __first,_ForwardIterator __last,_BinaryPredicate __pred)28 adjacent_find(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred) {
29 if (__first != __last) {
30 _ForwardIterator __i = __first;
31 while (++__i != __last) {
32 if (__pred(*__first, *__i))
33 return __first;
34 __first = __i;
35 }
36 }
37 return __last;
38 }
39
40 template <class _ForwardIterator>
41 _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator
adjacent_find(_ForwardIterator __first,_ForwardIterator __last)42 adjacent_find(_ForwardIterator __first, _ForwardIterator __last) {
43 typedef typename iterator_traits<_ForwardIterator>::value_type __v;
44 return _VSTD::adjacent_find(__first, __last, __equal_to<__v>());
45 }
46
47 _LIBCPP_END_NAMESPACE_STD
48
49 _LIBCPP_POP_MACROS
50
51 #endif // _LIBCPP___ALGORITHM_ADJACENT_FIND_H
52