60 lines · c
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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef _LIBCPP___CXX03___ALGORITHM_MAKE_HEAP_H10#define _LIBCPP___CXX03___ALGORITHM_MAKE_HEAP_H11 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_header22#endif23 24_LIBCPP_PUSH_MACROS25#include <__cxx03/__undef_macros>26 27_LIBCPP_BEGIN_NAMESPACE_STD28 29template <class _AlgPolicy, class _Compare, class _RandomAccessIterator>30inline _LIBCPP_HIDE_FROM_ABI void31__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 children38 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 44template <class _RandomAccessIterator, class _Compare>45inline _LIBCPP_HIDE_FROM_ABI void46make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp) {47 std::__make_heap<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __comp);48}49 50template <class _RandomAccessIterator>51inline _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_STD56 57_LIBCPP_POP_MACROS58 59#endif // _LIBCPP___CXX03___ALGORITHM_MAKE_HEAP_H60