1 //===----------------------------------------------------------------------===//
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
7 //===----------------------------------------------------------------------===//
9 #ifndef _LIBCPP___ALGORITHM_IS_HEAP_UNTIL_H
10 #define _LIBCPP___ALGORITHM_IS_HEAP_UNTIL_H
12 #include <__algorithm/comp.h>
13 #include <__algorithm/comp_ref_type.h>
15 #include <__iterator/iterator_traits.h>
17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18 #pragma GCC system_header
21 _LIBCPP_BEGIN_NAMESPACE_STD
23 template <class _Compare, class _RandomAccessIterator>
24 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 _RandomAccessIterator
25 __is_heap_until(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp)
27 typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type;
28 difference_type __len = __last - __first;
29 difference_type __p = 0;
30 difference_type __c = 1;
31 _RandomAccessIterator __pp = __first;
34 _RandomAccessIterator __cp = __first + __c;
35 if (__comp(*__pp, *__cp))
41 if (__comp(*__pp, *__cp))
50 template <class _RandomAccessIterator, class _Compare>
51 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 _RandomAccessIterator
52 is_heap_until(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp)
54 typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
55 return _VSTD::__is_heap_until<_Comp_ref>(__first, __last, __comp);
58 template<class _RandomAccessIterator>
59 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 _RandomAccessIterator
60 is_heap_until(_RandomAccessIterator __first, _RandomAccessIterator __last)
62 return _VSTD::__is_heap_until(__first, __last, __less<typename iterator_traits<_RandomAccessIterator>::value_type>());
65 _LIBCPP_END_NAMESPACE_STD
67 #endif // _LIBCPP___ALGORITHM_IS_HEAP_UNTIL_H