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 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) 26 { 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; 32 while (__c < __len) 33 { 34 _RandomAccessIterator __cp = __first + __c; 35 if (__comp(*__pp, *__cp)) 36 return __cp; 37 ++__c; 38 ++__cp; 39 if (__c == __len) 40 return __last; 41 if (__comp(*__pp, *__cp)) 42 return __cp; 43 ++__p; 44 ++__pp; 45 __c = 2 * __p + 1; 46 } 47 return __last; 48 } 49 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) 53 { 54 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 55 return std::__is_heap_until(__first, __last, static_cast<_Comp_ref>(__comp)); 56 } 57 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) 61 { 62 return _VSTD::__is_heap_until(__first, __last, __less<typename iterator_traits<_RandomAccessIterator>::value_type>()); 63 } 64 65 _LIBCPP_END_NAMESPACE_STD 66 67 #endif // _LIBCPP___ALGORITHM_IS_HEAP_UNTIL_H 68