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 static_assert(
27 __has_forward_iterator_category<_ForwardIterator>::value, "std::max_element requires a ForwardIterator");
28 if (__first != __last) {
29 _ForwardIterator __i = __first;
30 while (++__i != __last)
31 if (__comp(*__first, *__i))
32 __first = __i;
33 }
34 return __first;
35 }
36
37 template <class _ForwardIterator, class _Compare>
38 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator
max_element(_ForwardIterator __first,_ForwardIterator __last,_Compare __comp)39 max_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) {
40 return std::__max_element<__comp_ref_type<_Compare> >(__first, __last, __comp);
41 }
42
43 template <class _ForwardIterator>
44 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator
max_element(_ForwardIterator __first,_ForwardIterator __last)45 max_element(_ForwardIterator __first, _ForwardIterator __last) {
46 return std::max_element(__first, __last, __less<>());
47 }
48
49 _LIBCPP_END_NAMESPACE_STD
50
51 #endif // _LIBCPP___ALGORITHM_MAX_ELEMENT_H
52