1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #ifndef _LIBCPP___ALGORITHM_IS_SORTED_UNTIL_H
10 #define _LIBCPP___ALGORITHM_IS_SORTED_UNTIL_H
11 
12 #include <__config>
13 #include <__algorithm/comp.h>
14 #include <__iterator/iterator_traits.h>
15 
16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17 #pragma GCC system_header
18 #endif
19 
20 _LIBCPP_PUSH_MACROS
21 #include <__undef_macros>
22 
23 _LIBCPP_BEGIN_NAMESPACE_STD
24 
25 template <class _ForwardIterator, class _Compare>
26 _LIBCPP_NODISCARD_EXT _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator
27 is_sorted_until(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp)
28 {
29     if (__first != __last)
30     {
31         _ForwardIterator __i = __first;
32         while (++__i != __last)
33         {
34             if (__comp(*__i, *__first))
35                 return __i;
36             __first = __i;
37         }
38     }
39     return __last;
40 }
41 
42 template<class _ForwardIterator>
43 _LIBCPP_NODISCARD_EXT inline
44 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
45 _ForwardIterator
46 is_sorted_until(_ForwardIterator __first, _ForwardIterator __last)
47 {
48     return _VSTD::is_sorted_until(__first, __last, __less<typename iterator_traits<_ForwardIterator>::value_type>());
49 }
50 
51 _LIBCPP_END_NAMESPACE_STD
52 
53 _LIBCPP_POP_MACROS
54 
55 #endif // _LIBCPP___ALGORITHM_IS_SORTED_UNTIL_H
56