WTF
ListRefPtr.h
Go to the documentation of this file.00001 // -*- mode: c++; c-basic-offset: 4 -*- 00002 /* 00003 * This file is part of the KDE libraries 00004 * Copyright (C) 2005 Apple Computer, Inc. 00005 * 00006 * This library is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Library General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2 of the License, or (at your option) any later version. 00010 * 00011 * This library is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Library General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Library General Public License 00017 * along with this library; see the file COPYING.LIB. If not, write to 00018 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 00019 * Boston, MA 02110-1301, USA. 00020 * 00021 */ 00022 00023 #ifndef WTF_ListRefPtr_h 00024 #define WTF_ListRefPtr_h 00025 00026 #include "RefPtr.h" 00027 00028 namespace WTF { 00029 00030 // Specialized version of RefPtr desgined for use in singly-linked lists. 00031 // Derefs the list iteratively to avoid recursive derefing that can overflow the stack. 00032 template <typename T> class ListRefPtr : public RefPtr<T> 00033 { 00034 public: 00035 ListRefPtr() : RefPtr<T>() {} 00036 ListRefPtr(T *ptr) : RefPtr<T>(ptr) {} 00037 ListRefPtr(const RefPtr<T>& o) : RefPtr<T>(o) {} 00038 // see comment in PassRefPtr.h for why this takes const reference 00039 template <typename U> ListRefPtr(const PassRefPtr<U>& o) : RefPtr<T>(o) {} 00040 00041 ~ListRefPtr() { 00042 RefPtr<T> reaper = this->release(); 00043 while (reaper && reaper->refcount() == 1) 00044 reaper = reaper->releaseNext(); // implicitly protects reaper->next, then derefs reaper 00045 } 00046 00047 ListRefPtr& operator=(T *optr) { RefPtr<T>::operator=(optr); return *this; } 00048 ListRefPtr& operator=(const RefPtr<T>& o) { RefPtr<T>::operator=(o); return *this; } 00049 ListRefPtr& operator=(const PassRefPtr<T>& o) { RefPtr<T>::operator=(o); return *this; } 00050 template <typename U> ListRefPtr& operator=(const RefPtr<U>& o) { RefPtr<T>::operator=(o); return *this; } 00051 template <typename U> ListRefPtr& operator=(const PassRefPtr<U>& o) { RefPtr<T>::operator=(o); return *this; } 00052 }; 00053 00054 } // namespace WTF 00055 00056 using WTF::ListRefPtr; 00057 00058 #endif // WTF_ListRefPtr_h 00059