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_PUSH_HEAP_H 10 #define _LIBCPP___ALGORITHM_PUSH_HEAP_H 11 12 #include <__algorithm/comp.h> 13 #include <__algorithm/comp_ref_type.h> 14 #include <__config> 15 #include <__iterator/iterator_traits.h> 16 #include <__utility/move.h> 17 18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19 # pragma GCC system_header 20 # pragma clang include_instead(<algorithm>) 21 #endif 22 23 _LIBCPP_BEGIN_NAMESPACE_STD 24 25 template <class _Compare, class _RandomAccessIterator> 26 _LIBCPP_CONSTEXPR_AFTER_CXX11 void 27 __sift_up(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp, 28 typename iterator_traits<_RandomAccessIterator>::difference_type __len) 29 { 30 typedef typename iterator_traits<_RandomAccessIterator>::value_type value_type; 31 if (__len > 1) 32 { 33 __len = (__len - 2) / 2; 34 _RandomAccessIterator __ptr = __first + __len; 35 if (__comp(*__ptr, *--__last)) 36 { 37 value_type __t(_VSTD::move(*__last)); 38 do 39 { 40 *__last = _VSTD::move(*__ptr); 41 __last = __ptr; 42 if (__len == 0) 43 break; 44 __len = (__len - 1) / 2; 45 __ptr = __first + __len; 46 } while (__comp(*__ptr, __t)); 47 *__last = _VSTD::move(__t); 48 } 49 } 50 } 51 52 template <class _RandomAccessIterator, class _Compare> 53 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 54 void 55 push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp) 56 { 57 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 58 _VSTD::__sift_up<_Comp_ref>(__first, __last, __comp, __last - __first); 59 } 60 61 template <class _RandomAccessIterator> 62 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 63 void 64 push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last) 65 { 66 _VSTD::push_heap(__first, __last, __less<typename iterator_traits<_RandomAccessIterator>::value_type>()); 67 } 68 69 _LIBCPP_END_NAMESPACE_STD 70 71 #endif // _LIBCPP___ALGORITHM_PUSH_HEAP_H 72