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b07b5bd727
This is not mandated by the standard, so it goes in libcxx/test/libcxx/. It's certainly arguable that the algorithms changed here (`is_heap`, `is_sorted`, `min`, `max`) are harmless and we should just let them copy their comparators once. But at the same time, it's nice to have all our algorithms be 100% consistent and never copy a comparator, not even once. Differential Revision: https://reviews.llvm.org/D114136
59 lines
2.0 KiB
C++
59 lines
2.0 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ALGORITHM_MAX_ELEMENT_H
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#define _LIBCPP___ALGORITHM_MAX_ELEMENT_H
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#include <__config>
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#include <__algorithm/comp.h>
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#include <__algorithm/comp_ref_type.h>
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#include <__iterator/iterator_traits.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _Compare, class _ForwardIterator>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 _ForwardIterator
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__max_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp)
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{
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static_assert(__is_cpp17_forward_iterator<_ForwardIterator>::value,
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"std::max_element requires a ForwardIterator");
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if (__first != __last)
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{
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_ForwardIterator __i = __first;
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while (++__i != __last)
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if (__comp(*__first, *__i))
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__first = __i;
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}
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return __first;
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}
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template <class _ForwardIterator, class _Compare>
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_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 _ForwardIterator
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max_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp)
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{
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typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
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return _VSTD::__max_element<_Comp_ref>(__first, __last, __comp);
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}
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template <class _ForwardIterator>
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_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 _ForwardIterator
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max_element(_ForwardIterator __first, _ForwardIterator __last)
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{
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return _VSTD::max_element(__first, __last,
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__less<typename iterator_traits<_ForwardIterator>::value_type>());
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ALGORITHM_MAX_ELEMENT_H
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