1fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 2fe6060f1SDimitry Andric // 3fe6060f1SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4fe6060f1SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5fe6060f1SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6fe6060f1SDimitry Andric // 7fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 8fe6060f1SDimitry Andric 9fe6060f1SDimitry Andric #ifndef _LIBCPP___ALGORITHM_IS_HEAP_UNTIL_H 10fe6060f1SDimitry Andric #define _LIBCPP___ALGORITHM_IS_HEAP_UNTIL_H 11fe6060f1SDimitry Andric 12fe6060f1SDimitry Andric #include <__algorithm/comp.h> 135e801ac6SDimitry Andric #include <__algorithm/comp_ref_type.h> 1404eeddc0SDimitry Andric #include <__config> 15fe6060f1SDimitry Andric #include <__iterator/iterator_traits.h> 16fe6060f1SDimitry Andric 17fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18fe6060f1SDimitry Andric # pragma GCC system_header 19fe6060f1SDimitry Andric #endif 20fe6060f1SDimitry Andric 21fe6060f1SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 22fe6060f1SDimitry Andric 235e801ac6SDimitry Andric template <class _Compare, class _RandomAccessIterator> 24bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _RandomAccessIterator 25cb14a3feSDimitry Andric __is_heap_until(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare&& __comp) { 26fe6060f1SDimitry Andric typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type; 27fe6060f1SDimitry Andric difference_type __len = __last - __first; 28fe6060f1SDimitry Andric difference_type __p = 0; 29fe6060f1SDimitry Andric difference_type __c = 1; 30fe6060f1SDimitry Andric _RandomAccessIterator __pp = __first; 31cb14a3feSDimitry Andric while (__c < __len) { 32fe6060f1SDimitry Andric _RandomAccessIterator __cp = __first + __c; 33fe6060f1SDimitry Andric if (__comp(*__pp, *__cp)) 34fe6060f1SDimitry Andric return __cp; 35fe6060f1SDimitry Andric ++__c; 36fe6060f1SDimitry Andric ++__cp; 37fe6060f1SDimitry Andric if (__c == __len) 38fe6060f1SDimitry Andric return __last; 39fe6060f1SDimitry Andric if (__comp(*__pp, *__cp)) 40fe6060f1SDimitry Andric return __cp; 41fe6060f1SDimitry Andric ++__p; 42fe6060f1SDimitry Andric ++__pp; 43fe6060f1SDimitry Andric __c = 2 * __p + 1; 44fe6060f1SDimitry Andric } 45fe6060f1SDimitry Andric return __last; 46fe6060f1SDimitry Andric } 47fe6060f1SDimitry Andric 485e801ac6SDimitry Andric template <class _RandomAccessIterator, class _Compare> 49*0fca6ea1SDimitry Andric _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _RandomAccessIterator 50cb14a3feSDimitry Andric is_heap_until(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp) { 51bdd1243dSDimitry Andric return std::__is_heap_until(__first, __last, static_cast<__comp_ref_type<_Compare> >(__comp)); 525e801ac6SDimitry Andric } 535e801ac6SDimitry Andric 54fe6060f1SDimitry Andric template <class _RandomAccessIterator> 55*0fca6ea1SDimitry Andric _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _RandomAccessIterator 56cb14a3feSDimitry Andric is_heap_until(_RandomAccessIterator __first, _RandomAccessIterator __last) { 575f757f3fSDimitry Andric return std::__is_heap_until(__first, __last, __less<>()); 58fe6060f1SDimitry Andric } 59fe6060f1SDimitry Andric 60fe6060f1SDimitry Andric _LIBCPP_END_NAMESPACE_STD 61fe6060f1SDimitry Andric 62fe6060f1SDimitry Andric #endif // _LIBCPP___ALGORITHM_IS_HEAP_UNTIL_H 63