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| 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___CXX03___ALGORITHM_IS_HEAP_UNTIL_H |
| 10 | #define _LIBCPP___CXX03___ALGORITHM_IS_HEAP_UNTIL_H |
| 11 | |
| 12 | #include <__cxx03/__algorithm/comp.h> |
| 13 | #include <__cxx03/__algorithm/comp_ref_type.h> |
| 14 | #include <__cxx03/__config> |
| 15 | #include <__cxx03/__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 | |
| 23 | template <class _Compare, class _RandomAccessIterator> |
| 24 | _LIBCPP_HIDE_FROM_ABI _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 | |
| 48 | template <class _RandomAccessIterator, class _Compare> |
| 49 | _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _RandomAccessIterator |
| 50 | is_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 | |
| 54 | template <class _RandomAccessIterator> |
| 55 | _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _RandomAccessIterator |
| 56 | is_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___CXX03___ALGORITHM_IS_HEAP_UNTIL_H |
| 63 |
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