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| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef _LIBCPP___CXX03___ALGORITHM_MAKE_HEAP_H |
| 10 | #define _LIBCPP___CXX03___ALGORITHM_MAKE_HEAP_H |
| 11 | |
| 12 | #include <__cxx03/__algorithm/comp.h> |
| 13 | #include <__cxx03/__algorithm/comp_ref_type.h> |
| 14 | #include <__cxx03/__algorithm/iterator_operations.h> |
| 15 | #include <__cxx03/__algorithm/sift_down.h> |
| 16 | #include <__cxx03/__config> |
| 17 | #include <__cxx03/__iterator/iterator_traits.h> |
| 18 | #include <__cxx03/__utility/move.h> |
| 19 | |
| 20 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 21 | # pragma GCC system_header |
| 22 | #endif |
| 23 | |
| 24 | _LIBCPP_PUSH_MACROS |
| 25 | #include <__cxx03/__undef_macros> |
| 26 | |
| 27 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 28 | |
| 29 | template <class _AlgPolicy, class _Compare, class _RandomAccessIterator> |
| 30 | inline _LIBCPP_HIDE_FROM_ABI void |
| 31 | __make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare&& __comp) { |
| 32 | __comp_ref_type<_Compare> __comp_ref = __comp; |
| 33 | |
| 34 | using difference_type = typename iterator_traits<_RandomAccessIterator>::difference_type; |
| 35 | difference_type __n = __last - __first; |
| 36 | if (__n > 1) { |
| 37 | // start from the first parent, there is no need to consider children |
| 38 | for (difference_type __start = (__n - 2) / 2; __start >= 0; --__start) { |
| 39 | std::__sift_down<_AlgPolicy>(__first, __comp_ref, __n, __first + __start); |
| 40 | } |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | template <class _RandomAccessIterator, class _Compare> |
| 45 | inline _LIBCPP_HIDE_FROM_ABI void |
| 46 | make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp) { |
| 47 | std::__make_heap<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __comp); |
| 48 | } |
| 49 | |
| 50 | template <class _RandomAccessIterator> |
| 51 | inline _LIBCPP_HIDE_FROM_ABI void make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last) { |
| 52 | std::make_heap(std::move(__first), std::move(__last), __less<>()); |
| 53 | } |
| 54 | |
| 55 | _LIBCPP_END_NAMESPACE_STD |
| 56 | |
| 57 | _LIBCPP_POP_MACROS |
| 58 | |
| 59 | #endif // _LIBCPP___CXX03___ALGORITHM_MAKE_HEAP_H |
| 60 |
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