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 <__iterator/iterator_traits.h> 14 15 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 16 #pragma GCC system_header 17 #endif 18 19 _LIBCPP_PUSH_MACROS 20 #include <__undef_macros> 21 22 _LIBCPP_BEGIN_NAMESPACE_STD 23 24 template <class _ForwardIterator, class _Compare> 25 _LIBCPP_NODISCARD_EXT inline 26 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 27 _ForwardIterator 28 max_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) 29 { 30 static_assert(__is_cpp17_forward_iterator<_ForwardIterator>::value, 31 "std::max_element requires a ForwardIterator"); 32 if (__first != __last) 33 { 34 _ForwardIterator __i = __first; 35 while (++__i != __last) 36 if (__comp(*__first, *__i)) 37 __first = __i; 38 } 39 return __first; 40 } 41 42 43 template <class _ForwardIterator> 44 _LIBCPP_NODISCARD_EXT inline 45 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 46 _ForwardIterator 47 max_element(_ForwardIterator __first, _ForwardIterator __last) 48 { 49 return _VSTD::max_element(__first, __last, 50 __less<typename iterator_traits<_ForwardIterator>::value_type>()); 51 } 52 53 _LIBCPP_END_NAMESPACE_STD 54 55 _LIBCPP_POP_MACROS 56 57 #endif // _LIBCPP___ALGORITHM_MAX_ELEMENT_H 58