88 lines
3.7 KiB
C++
88 lines
3.7 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_PARTIAL_SORT_COPY_H
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#define _LIBCPP___ALGORITHM_PARTIAL_SORT_COPY_H
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#include <__algorithm/comp.h>
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#include <__algorithm/comp_ref_type.h>
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#include <__algorithm/iterator_operations.h>
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#include <__algorithm/make_heap.h>
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#include <__algorithm/make_projected.h>
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#include <__algorithm/sift_down.h>
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#include <__algorithm/sort_heap.h>
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#include <__config>
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#include <__functional/identity.h>
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#include <__functional/invoke.h>
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#include <__iterator/iterator_traits.h>
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#include <__type_traits/is_callable.h>
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#include <__utility/move.h>
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#include <__utility/pair.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 _AlgPolicy, class _Compare,
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class _InputIterator, class _Sentinel1, class _RandomAccessIterator, class _Sentinel2,
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class _Proj1, class _Proj2>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_InputIterator, _RandomAccessIterator>
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__partial_sort_copy(_InputIterator __first, _Sentinel1 __last,
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_RandomAccessIterator __result_first, _Sentinel2 __result_last,
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_Compare&& __comp, _Proj1&& __proj1, _Proj2&& __proj2)
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{
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_RandomAccessIterator __r = __result_first;
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auto&& __projected_comp = std::__make_projected(__comp, __proj2);
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if (__r != __result_last)
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{
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for (; __first != __last && __r != __result_last; ++__first, (void) ++__r)
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*__r = *__first;
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std::__make_heap<_AlgPolicy>(__result_first, __r, __projected_comp);
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typename iterator_traits<_RandomAccessIterator>::difference_type __len = __r - __result_first;
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for (; __first != __last; ++__first)
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if (std::__invoke(__comp, std::__invoke(__proj1, *__first), std::__invoke(__proj2, *__result_first))) {
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*__result_first = *__first;
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std::__sift_down<_AlgPolicy>(__result_first, __projected_comp, __len, __result_first);
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}
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std::__sort_heap<_AlgPolicy>(__result_first, __r, __projected_comp);
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}
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return pair<_InputIterator, _RandomAccessIterator>(
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_IterOps<_AlgPolicy>::next(std::move(__first), std::move(__last)), std::move(__r));
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}
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template <class _InputIterator, class _RandomAccessIterator, class _Compare>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
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_RandomAccessIterator
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partial_sort_copy(_InputIterator __first, _InputIterator __last,
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_RandomAccessIterator __result_first, _RandomAccessIterator __result_last, _Compare __comp)
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{
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static_assert(__is_callable<_Compare, decltype(*__first), decltype(*__result_first)>::value,
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"Comparator has to be callable");
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auto __result = std::__partial_sort_copy<_ClassicAlgPolicy>(__first, __last, __result_first, __result_last,
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static_cast<__comp_ref_type<_Compare> >(__comp), __identity(), __identity());
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return __result.second;
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}
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template <class _InputIterator, class _RandomAccessIterator>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
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_RandomAccessIterator
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partial_sort_copy(_InputIterator __first, _InputIterator __last,
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_RandomAccessIterator __result_first, _RandomAccessIterator __result_last)
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{
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return _VSTD::partial_sort_copy(__first, __last, __result_first, __result_last, __less<>());
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ALGORITHM_PARTIAL_SORT_COPY_H
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