mirror of
https://codeberg.org/ziglang/zig.git
synced 2026-05-02 07:49:22 +03:00
Alex Rønne Petersen
73 lines
2.7 KiB
C++
Vendored
73 lines
2.7 KiB
C++
Vendored
//===----------------------------------------------------------------------===//
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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_MAKE_HEAP_H
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#define _LIBCPP___ALGORITHM_MAKE_HEAP_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/push_heap.h>
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#include <__algorithm/sift_down.h>
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#include <__config>
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#include <__iterator/iterator_traits.h>
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#include <__type_traits/is_arithmetic.h>
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#include <__utility/move.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_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _AlgPolicy, class _Compare, class _RandomAccessIterator>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
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__make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare&& __comp) {
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__comp_ref_type<_Compare> __comp_ref = __comp;
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using __diff_t = __iterator_difference_type<_RandomAccessIterator>;
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const __diff_t __n = __last - __first;
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const bool __assume_both_children = is_arithmetic<__iterator_value_type<_RandomAccessIterator> >::value;
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// While it would be correct to always assume we have both children, in practice we observed this to be a performance
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// improvement only for arithmetic types.
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const __diff_t __sift_down_n = __assume_both_children ? ((__n & 1) ? __n : __n - 1) : __n;
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if (__n > 1) {
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// start from the first parent, there is no need to consider children
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for (__diff_t __start = (__sift_down_n - 2) / 2; __start >= 0; --__start) {
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std::__sift_down<_AlgPolicy, __assume_both_children>(__first, __comp_ref, __sift_down_n, __start);
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}
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if _LIBCPP_CONSTEXPR (__assume_both_children)
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std::__sift_up<_AlgPolicy>(__first, __last, __comp, __n);
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}
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}
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template <class _RandomAccessIterator, class _Compare>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
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make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp) {
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std::__make_heap<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __comp);
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}
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template <class _RandomAccessIterator>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
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make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last) {
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std::make_heap(std::move(__first), std::move(__last), __less<>());
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}
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___ALGORITHM_MAKE_HEAP_H
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