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_AFTER_CXX11 _ForwardIterator 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_AFTER_CXX11 _ForwardIterator 41 max_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) 42 { 43 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 44 return _VSTD::__max_element<_Comp_ref>(__first, __last, __comp); 45 } 46 47 48 template <class _ForwardIterator> 49 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 _ForwardIterator 50 max_element(_ForwardIterator __first, _ForwardIterator __last) 51 { 52 return _VSTD::max_element(__first, __last, 53 __less<typename iterator_traits<_ForwardIterator>::value_type>()); 54 } 55 56 _LIBCPP_END_NAMESPACE_STD 57 58 #endif // _LIBCPP___ALGORITHM_MAX_ELEMENT_H 59