forked from OSchip/llvm-project
68 lines
2.3 KiB
C++
68 lines
2.3 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_IS_HEAP_UNTIL_H
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#define _LIBCPP___ALGORITHM_IS_HEAP_UNTIL_H
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#include <__algorithm/comp.h>
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#include <__algorithm/comp_ref_type.h>
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#include <__config>
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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 _RandomAccessIterator>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 _RandomAccessIterator
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__is_heap_until(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp)
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{
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typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type;
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difference_type __len = __last - __first;
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difference_type __p = 0;
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difference_type __c = 1;
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_RandomAccessIterator __pp = __first;
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while (__c < __len)
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{
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_RandomAccessIterator __cp = __first + __c;
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if (__comp(*__pp, *__cp))
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return __cp;
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++__c;
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++__cp;
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if (__c == __len)
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return __last;
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if (__comp(*__pp, *__cp))
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return __cp;
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++__p;
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++__pp;
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__c = 2 * __p + 1;
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}
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return __last;
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}
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template <class _RandomAccessIterator, class _Compare>
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_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 _RandomAccessIterator
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is_heap_until(_RandomAccessIterator __first, _RandomAccessIterator __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::__is_heap_until<_Comp_ref>(__first, __last, __comp);
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}
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template<class _RandomAccessIterator>
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_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 _RandomAccessIterator
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is_heap_until(_RandomAccessIterator __first, _RandomAccessIterator __last)
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{
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return _VSTD::__is_heap_until(__first, __last, __less<typename iterator_traits<_RandomAccessIterator>::value_type>());
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ALGORITHM_IS_HEAP_UNTIL_H
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