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 #endif 21 22 _LIBCPP_BEGIN_NAMESPACE_STD 23 24 template <class _Compare, class _RandomAccessIterator> 25 _LIBCPP_CONSTEXPR_AFTER_CXX11 void 26 __sift_up(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp, 27 typename iterator_traits<_RandomAccessIterator>::difference_type __len) 28 { 29 typedef typename iterator_traits<_RandomAccessIterator>::value_type value_type; 30 if (__len > 1) 31 { 32 __len = (__len - 2) / 2; 33 _RandomAccessIterator __ptr = __first + __len; 34 if (__comp(*__ptr, *--__last)) 35 { 36 value_type __t(_VSTD::move(*__last)); 37 do 38 { 39 *__last = _VSTD::move(*__ptr); 40 __last = __ptr; 41 if (__len == 0) 42 break; 43 __len = (__len - 1) / 2; 44 __ptr = __first + __len; 45 } while (__comp(*__ptr, __t)); 46 *__last = _VSTD::move(__t); 47 } 48 } 49 } 50 51 template <class _RandomAccessIterator, class _Compare> 52 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 53 void 54 push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp) 55 { 56 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 57 _VSTD::__sift_up<_Comp_ref>(__first, __last, __comp, __last - __first); 58 } 59 60 template <class _RandomAccessIterator> 61 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 62 void 63 push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last) 64 { 65 _VSTD::push_heap(__first, __last, __less<typename iterator_traits<_RandomAccessIterator>::value_type>()); 66 } 67 68 _LIBCPP_END_NAMESPACE_STD 69 70 #endif // _LIBCPP___ALGORITHM_PUSH_HEAP_H 71