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_MAX_ELEMENT_H
10 #define _LIBCPP___ALGORITHM_MAX_ELEMENT_H
11
12 #include <__algorithm/comp.h>
13 #include <__algorithm/comp_ref_type.h>
14 #include <__config>
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_BEGIN_NAMESPACE_STD
22
23 template <class _Compare, class _ForwardIterator>
24 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator
__max_element(_ForwardIterator __first,_ForwardIterator __last,_Compare __comp)25 __max_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp)
26 {
27 static_assert(__is_cpp17_forward_iterator<_ForwardIterator>::value,
28 "std::max_element requires a ForwardIterator");
29 if (__first != __last)
30 {
31 _ForwardIterator __i = __first;
32 while (++__i != __last)
33 if (__comp(*__first, *__i))
34 __first = __i;
35 }
36 return __first;
37 }
38
39 template <class _ForwardIterator, class _Compare>
40 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator
max_element(_ForwardIterator __first,_ForwardIterator __last,_Compare __comp)41 max_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp)
42 {
43 return _VSTD::__max_element<__comp_ref_type<_Compare> >(__first, __last, __comp);
44 }
45
46
47 template <class _ForwardIterator>
48 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator
max_element(_ForwardIterator __first,_ForwardIterator __last)49 max_element(_ForwardIterator __first, _ForwardIterator __last)
50 {
51 return _VSTD::max_element(__first, __last,
52 __less<typename iterator_traits<_ForwardIterator>::value_type>());
53 }
54
55 _LIBCPP_END_NAMESPACE_STD
56
57 #endif // _LIBCPP___ALGORITHM_MAX_ELEMENT_H
58