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_ref_type.h> 14 #include <__iterator/iterator_traits.h> 15 #include <type_traits> 16 17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18 #pragma GCC system_header 19 #endif 20 21 _LIBCPP_PUSH_MACROS 22 #include <__undef_macros> 23 24 _LIBCPP_BEGIN_NAMESPACE_STD 25 26 template <class _Compare, class _RandomAccessIterator> 27 _LIBCPP_CONSTEXPR_AFTER_CXX11 void 28 __sift_up(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp, 29 typename iterator_traits<_RandomAccessIterator>::difference_type __len) 30 { 31 typedef typename iterator_traits<_RandomAccessIterator>::value_type value_type; 32 if (__len > 1) 33 { 34 __len = (__len - 2) / 2; 35 _RandomAccessIterator __ptr = __first + __len; 36 if (__comp(*__ptr, *--__last)) 37 { 38 value_type __t(_VSTD::move(*__last)); 39 do 40 { 41 *__last = _VSTD::move(*__ptr); 42 __last = __ptr; 43 if (__len == 0) 44 break; 45 __len = (__len - 1) / 2; 46 __ptr = __first + __len; 47 } while (__comp(*__ptr, __t)); 48 *__last = _VSTD::move(__t); 49 } 50 } 51 } 52 53 template <class _RandomAccessIterator, class _Compare> 54 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 55 void 56 push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp) 57 { 58 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 59 _VSTD::__sift_up<_Comp_ref>(__first, __last, __comp, __last - __first); 60 } 61 62 template <class _RandomAccessIterator> 63 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 64 void 65 push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last) 66 { 67 _VSTD::push_heap(__first, __last, __less<typename iterator_traits<_RandomAccessIterator>::value_type>()); 68 } 69 70 _LIBCPP_END_NAMESPACE_STD 71 72 _LIBCPP_POP_MACROS 73 74 #endif // _LIBCPP___ALGORITHM_PUSH_HEAP_H 75