// -*- mode: c++; c-basic-offset: 4 -*- /* * Copyright (C) 2005, 2006 Apple Computer, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public License * along with this library; see the file COPYING.LIB. If not, write to * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, * Boston, MA 02110-1301, USA. * */ #ifndef KXMLCORE_LIST_REF_PTR_H #define KXMLCORE_LIST_REF_PTR_H #include <wtf/RefPtr.h> namespace WTF { // Specialized version of RefPtr desgined for use in singly-linked lists. // Derefs the list iteratively to avoid recursive derefing that can overflow the stack. template <typename T> class ListRefPtr : public RefPtr<T> { public: ListRefPtr() : RefPtr<T>() {} ListRefPtr(T* ptr) : RefPtr<T>(ptr) {} ListRefPtr(const RefPtr<T>& o) : RefPtr<T>(o) {} // see comment in PassRefPtr.h for why this takes const reference template <typename U> ListRefPtr(const PassRefPtr<U>& o) : RefPtr<T>(o) {} ~ListRefPtr() { RefPtr<T> reaper = this->release(); while (reaper && reaper->refcount() == 1) reaper = reaper->releaseNext(); // implicitly protects reaper->next, then derefs reaper } ListRefPtr& operator=(T* optr) { RefPtr<T>::operator=(optr); return *this; } ListRefPtr& operator=(const RefPtr<T>& o) { RefPtr<T>::operator=(o); return *this; } ListRefPtr& operator=(const PassRefPtr<T>& o) { RefPtr<T>::operator=(o); return *this; } template <typename U> ListRefPtr& operator=(const RefPtr<U>& o) { RefPtr<T>::operator=(o); return *this; } template <typename U> ListRefPtr& operator=(const PassRefPtr<U>& o) { RefPtr<T>::operator=(o); return *this; } }; template <typename T> inline T* getPtr(const ListRefPtr<T>& p) { return p.get(); } } // namespace WTF using WTF::ListRefPtr; #endif // KXMLCORE_LIST_REF_PTR_H