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___ALGORITHM_IS_HEAP_UNTIL_H
10#define _LIBCPP___ALGORITHM_IS_HEAP_UNTIL_H
11
12#include <__algorithm/comp.h>
13#include <__algorithm/comp_ref_type.h>
14#include <__config>
15#include <__iterator/iterator_traits.h>
16
17#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18#  pragma GCC system_header
19#endif
20
21_LIBCPP_BEGIN_NAMESPACE_STD
22
23template <class _Compare, class _RandomAccessIterator>
24_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _RandomAccessIterator
25__is_heap_until(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare&& __comp) {
26  typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type;
27  difference_type __len      = __last - __first;
28  difference_type __p        = 0;
29  difference_type __c        = 1;
30  _RandomAccessIterator __pp = __first;
31  while (__c < __len) {
32    _RandomAccessIterator __cp = __first + __c;
33    if (__comp(*__pp, *__cp))
34      return __cp;
35    ++__c;
36    ++__cp;
37    if (__c == __len)
38      return __last;
39    if (__comp(*__pp, *__cp))
40      return __cp;
41    ++__p;
42    ++__pp;
43    __c = 2 * __p + 1;
44  }
45  return __last;
46}
47
48template <class _RandomAccessIterator, class _Compare>
49[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _RandomAccessIterator
50is_heap_until(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp) {
51  return std::__is_heap_until(__first, __last, static_cast<__comp_ref_type<_Compare> >(__comp));
52}
53
54template <class _RandomAccessIterator>
55[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _RandomAccessIterator
56is_heap_until(_RandomAccessIterator __first, _RandomAccessIterator __last) {
57  return std::__is_heap_until(__first, __last, __less<>());
58}
59
60_LIBCPP_END_NAMESPACE_STD
61
62#endif // _LIBCPP___ALGORITHM_IS_HEAP_UNTIL_H