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 <__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_BEGIN_NAMESPACE_STD 21 22 template <class _ForwardIterator, class _Compare> 23 _LIBCPP_NODISCARD_EXT inline 24 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 25 _ForwardIterator 26 max_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) 27 { 28 static_assert(__is_cpp17_forward_iterator<_ForwardIterator>::value, 29 "std::max_element requires a ForwardIterator"); 30 if (__first != __last) 31 { 32 _ForwardIterator __i = __first; 33 while (++__i != __last) 34 if (__comp(*__first, *__i)) 35 __first = __i; 36 } 37 return __first; 38 } 39 40 41 template <class _ForwardIterator> 42 _LIBCPP_NODISCARD_EXT inline 43 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 44 _ForwardIterator 45 max_element(_ForwardIterator __first, _ForwardIterator __last) 46 { 47 return _VSTD::max_element(__first, __last, 48 __less<typename iterator_traits<_ForwardIterator>::value_type>()); 49 } 50 51 _LIBCPP_END_NAMESPACE_STD 52 53 #endif // _LIBCPP___ALGORITHM_MAX_ELEMENT_H 54