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 <__config> 13 #include <__algorithm/comp.h> 14 #include <__algorithm/comp_ref_type.h> 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_PUSH_MACROS 23 #include <__undef_macros> 24 25 _LIBCPP_BEGIN_NAMESPACE_STD 26 27 template <class _Compare, class _RandomAccessIterator> 28 _LIBCPP_CONSTEXPR_AFTER_CXX11 void 29 __sift_up(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp, 30 typename iterator_traits<_RandomAccessIterator>::difference_type __len) 31 { 32 typedef typename iterator_traits<_RandomAccessIterator>::value_type value_type; 33 if (__len > 1) 34 { 35 __len = (__len - 2) / 2; 36 _RandomAccessIterator __ptr = __first + __len; 37 if (__comp(*__ptr, *--__last)) 38 { 39 value_type __t(_VSTD::move(*__last)); 40 do 41 { 42 *__last = _VSTD::move(*__ptr); 43 __last = __ptr; 44 if (__len == 0) 45 break; 46 __len = (__len - 1) / 2; 47 __ptr = __first + __len; 48 } while (__comp(*__ptr, __t)); 49 *__last = _VSTD::move(__t); 50 } 51 } 52 } 53 54 template <class _RandomAccessIterator, class _Compare> 55 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 56 void 57 push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp) 58 { 59 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 60 _VSTD::__sift_up<_Comp_ref>(__first, __last, __comp, __last - __first); 61 } 62 63 template <class _RandomAccessIterator> 64 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 65 void 66 push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last) 67 { 68 _VSTD::push_heap(__first, __last, __less<typename iterator_traits<_RandomAccessIterator>::value_type>()); 69 } 70 71 _LIBCPP_END_NAMESPACE_STD 72 73 _LIBCPP_POP_MACROS 74 75 #endif // _LIBCPP___ALGORITHM_PUSH_HEAP_H 76