| //===----------------------------------------------------------------------===// |
| // |
| // 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_MAKE_HEAP_H |
| #define _LIBCPP___ALGORITHM_MAKE_HEAP_H |
| |
| #include <__algorithm/comp.h> |
| #include <__algorithm/comp_ref_type.h> |
| #include <__algorithm/iterator_operations.h> |
| #include <__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 _AlgPolicy, class _Compare, class _RandomAccessIterator> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| void __make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare&& __comp) { |
| using _CompRef = typename __comp_ref_type<_Compare>::type; |
| _CompRef __comp_ref = __comp; |
| |
| using difference_type = typename iterator_traits<_RandomAccessIterator>::difference_type; |
| difference_type __n = __last - __first; |
| if (__n > 1) { |
| // start from the first parent, there is no need to consider children |
| for (difference_type __start = (__n - 2) / 2; __start >= 0; --__start) { |
| std::__sift_down<_AlgPolicy>(__first, __comp_ref, __n, __first + __start); |
| } |
| } |
| } |
| |
| template <class _RandomAccessIterator, class _Compare> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 |
| void make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp) { |
| std::__make_heap<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __comp); |
| } |
| |
| template <class _RandomAccessIterator> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 |
| void make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last) { |
| std::make_heap(std::move(__first), std::move(__last), |
| __less<typename iterator_traits<_RandomAccessIterator>::value_type>()); |
| } |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___ALGORITHM_MAKE_HEAP_H |