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 # pragma clang include_instead(<algorithm>) 20 #endif 21 22 _LIBCPP_BEGIN_NAMESPACE_STD 23 24 template <class _Compare, class _ForwardIterator> 25 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 _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 template <class _ForwardIterator, class _Compare> 41 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 _ForwardIterator 42 max_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) 43 { 44 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 45 return _VSTD::__max_element<_Comp_ref>(__first, __last, __comp); 46 } 47 48 49 template <class _ForwardIterator> 50 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 _ForwardIterator 51 max_element(_ForwardIterator __first, _ForwardIterator __last) 52 { 53 return _VSTD::max_element(__first, __last, 54 __less<typename iterator_traits<_ForwardIterator>::value_type>()); 55 } 56 57 _LIBCPP_END_NAMESPACE_STD 58 59 #endif // _LIBCPP___ALGORITHM_MAX_ELEMENT_H 60