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author | Andrey Khalyavin <halyavin@gmail.com> | 2022-02-10 16:46:30 +0300 |
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committer | Daniil Cherednik <dcherednik@yandex-team.ru> | 2022-02-10 16:46:30 +0300 |
commit | 4b839d0704ee9be1dabb0310a1f03af24963637b (patch) | |
tree | 1a2c5ffcf89eb53ecd79dbc9bc0a195c27404d0c /contrib/libs/cxxsupp/libcxx/include/__algorithm/sift_down.h | |
parent | f773626848a7c7456803654292e716b83d69cc12 (diff) | |
download | ydb-4b839d0704ee9be1dabb0310a1f03af24963637b.tar.gz |
Restoring authorship annotation for Andrey Khalyavin <halyavin@gmail.com>. Commit 2 of 2.
Diffstat (limited to 'contrib/libs/cxxsupp/libcxx/include/__algorithm/sift_down.h')
-rw-r--r-- | contrib/libs/cxxsupp/libcxx/include/__algorithm/sift_down.h | 158 |
1 files changed, 79 insertions, 79 deletions
diff --git a/contrib/libs/cxxsupp/libcxx/include/__algorithm/sift_down.h b/contrib/libs/cxxsupp/libcxx/include/__algorithm/sift_down.h index b158824b9c..6e801b48b4 100644 --- a/contrib/libs/cxxsupp/libcxx/include/__algorithm/sift_down.h +++ b/contrib/libs/cxxsupp/libcxx/include/__algorithm/sift_down.h @@ -1,79 +1,79 @@ -//===----------------------------------------------------------------------===// -// -// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. -// See https://llvm.org/LICENSE.txt for license information. -// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception -// -//===----------------------------------------------------------------------===// - -#ifndef _LIBCPP___ALGORITHM_SIFT_DOWN_H -#define _LIBCPP___ALGORITHM_SIFT_DOWN_H - -#include <__config> -#include <__iterator/iterator_traits.h> -#include <__utility/move.h> - -#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) -#pragma GCC system_header -#endif - -_LIBCPP_BEGIN_NAMESPACE_STD - -template <class _Compare, class _RandomAccessIterator> -_LIBCPP_CONSTEXPR_AFTER_CXX11 void -__sift_down(_RandomAccessIterator __first, _RandomAccessIterator /*__last*/, - _Compare __comp, - typename iterator_traits<_RandomAccessIterator>::difference_type __len, - _RandomAccessIterator __start) -{ - typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type; - typedef typename iterator_traits<_RandomAccessIterator>::value_type value_type; - // left-child of __start is at 2 * __start + 1 - // right-child of __start is at 2 * __start + 2 - difference_type __child = __start - __first; - - if (__len < 2 || (__len - 2) / 2 < __child) - return; - - __child = 2 * __child + 1; - _RandomAccessIterator __child_i = __first + __child; - - if ((__child + 1) < __len && __comp(*__child_i, *(__child_i + 1))) { - // right-child exists and is greater than left-child - ++__child_i; - ++__child; - } - - // check if we are in heap-order - if (__comp(*__child_i, *__start)) - // we are, __start is larger than it's largest child - return; - - value_type __top(_VSTD::move(*__start)); - do - { - // we are not in heap-order, swap the parent with its largest child - *__start = _VSTD::move(*__child_i); - __start = __child_i; - - if ((__len - 2) / 2 < __child) - break; - - // recompute the child based off of the updated parent - __child = 2 * __child + 1; - __child_i = __first + __child; - - if ((__child + 1) < __len && __comp(*__child_i, *(__child_i + 1))) { - // right-child exists and is greater than left-child - ++__child_i; - ++__child; - } - - // check if we are in heap-order - } while (!__comp(*__child_i, __top)); - *__start = _VSTD::move(__top); -} - -_LIBCPP_END_NAMESPACE_STD - -#endif // _LIBCPP___ALGORITHM_SIFT_DOWN_H +//===----------------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#ifndef _LIBCPP___ALGORITHM_SIFT_DOWN_H +#define _LIBCPP___ALGORITHM_SIFT_DOWN_H + +#include <__config> +#include <__iterator/iterator_traits.h> +#include <__utility/move.h> + +#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) +#pragma GCC system_header +#endif + +_LIBCPP_BEGIN_NAMESPACE_STD + +template <class _Compare, class _RandomAccessIterator> +_LIBCPP_CONSTEXPR_AFTER_CXX11 void +__sift_down(_RandomAccessIterator __first, _RandomAccessIterator /*__last*/, + _Compare __comp, + typename iterator_traits<_RandomAccessIterator>::difference_type __len, + _RandomAccessIterator __start) +{ + typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type; + typedef typename iterator_traits<_RandomAccessIterator>::value_type value_type; + // left-child of __start is at 2 * __start + 1 + // right-child of __start is at 2 * __start + 2 + difference_type __child = __start - __first; + + if (__len < 2 || (__len - 2) / 2 < __child) + return; + + __child = 2 * __child + 1; + _RandomAccessIterator __child_i = __first + __child; + + if ((__child + 1) < __len && __comp(*__child_i, *(__child_i + 1))) { + // right-child exists and is greater than left-child + ++__child_i; + ++__child; + } + + // check if we are in heap-order + if (__comp(*__child_i, *__start)) + // we are, __start is larger than it's largest child + return; + + value_type __top(_VSTD::move(*__start)); + do + { + // we are not in heap-order, swap the parent with its largest child + *__start = _VSTD::move(*__child_i); + __start = __child_i; + + if ((__len - 2) / 2 < __child) + break; + + // recompute the child based off of the updated parent + __child = 2 * __child + 1; + __child_i = __first + __child; + + if ((__child + 1) < __len && __comp(*__child_i, *(__child_i + 1))) { + // right-child exists and is greater than left-child + ++__child_i; + ++__child; + } + + // check if we are in heap-order + } while (!__comp(*__child_i, __top)); + *__start = _VSTD::move(__top); +} + +_LIBCPP_END_NAMESPACE_STD + +#endif // _LIBCPP___ALGORITHM_SIFT_DOWN_H |