1e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 2e78f53d1SNikolas Klauser // 3e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information. 5e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6e78f53d1SNikolas Klauser // 7e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 8e78f53d1SNikolas Klauser 9*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___ALGORITHM_MAKE_HEAP_H 10*ce777190SNikolas Klauser #define _LIBCPP___CXX03___ALGORITHM_MAKE_HEAP_H 11e78f53d1SNikolas Klauser 1273fbae83SNikolas Klauser #include <__cxx03/__algorithm/comp.h> 1373fbae83SNikolas Klauser #include <__cxx03/__algorithm/comp_ref_type.h> 1473fbae83SNikolas Klauser #include <__cxx03/__algorithm/iterator_operations.h> 1573fbae83SNikolas Klauser #include <__cxx03/__algorithm/sift_down.h> 1673fbae83SNikolas Klauser #include <__cxx03/__config> 1773fbae83SNikolas Klauser #include <__cxx03/__iterator/iterator_traits.h> 1873fbae83SNikolas Klauser #include <__cxx03/__utility/move.h> 19e78f53d1SNikolas Klauser 20e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 21e78f53d1SNikolas Klauser # pragma GCC system_header 22e78f53d1SNikolas Klauser #endif 23e78f53d1SNikolas Klauser 24e78f53d1SNikolas Klauser _LIBCPP_PUSH_MACROS 2573fbae83SNikolas Klauser #include <__cxx03/__undef_macros> 26e78f53d1SNikolas Klauser 27e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD 28e78f53d1SNikolas Klauser 29e78f53d1SNikolas Klauser template <class _AlgPolicy, class _Compare, class _RandomAccessIterator> 30e78f53d1SNikolas Klauser inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void 31e78f53d1SNikolas Klauser __make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare&& __comp) { 32e78f53d1SNikolas Klauser __comp_ref_type<_Compare> __comp_ref = __comp; 33e78f53d1SNikolas Klauser 34e78f53d1SNikolas Klauser using difference_type = typename iterator_traits<_RandomAccessIterator>::difference_type; 35e78f53d1SNikolas Klauser difference_type __n = __last - __first; 36e78f53d1SNikolas Klauser if (__n > 1) { 37e78f53d1SNikolas Klauser // start from the first parent, there is no need to consider children 38e78f53d1SNikolas Klauser for (difference_type __start = (__n - 2) / 2; __start >= 0; --__start) { 39e78f53d1SNikolas Klauser std::__sift_down<_AlgPolicy>(__first, __comp_ref, __n, __first + __start); 40e78f53d1SNikolas Klauser } 41e78f53d1SNikolas Klauser } 42e78f53d1SNikolas Klauser } 43e78f53d1SNikolas Klauser 44e78f53d1SNikolas Klauser template <class _RandomAccessIterator, class _Compare> 45e78f53d1SNikolas Klauser inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void 46e78f53d1SNikolas Klauser make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp) { 47e78f53d1SNikolas Klauser std::__make_heap<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __comp); 48e78f53d1SNikolas Klauser } 49e78f53d1SNikolas Klauser 50e78f53d1SNikolas Klauser template <class _RandomAccessIterator> 51e78f53d1SNikolas Klauser inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void 52e78f53d1SNikolas Klauser make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last) { 53e78f53d1SNikolas Klauser std::make_heap(std::move(__first), std::move(__last), __less<>()); 54e78f53d1SNikolas Klauser } 55e78f53d1SNikolas Klauser 56e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD 57e78f53d1SNikolas Klauser 58e78f53d1SNikolas Klauser _LIBCPP_POP_MACROS 59e78f53d1SNikolas Klauser 60*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___ALGORITHM_MAKE_HEAP_H 61