| /* |
| * Copyright (C) 2005, 2006, 2008 Apple Inc. All rights reserved. |
| * |
| * 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 WTF_ListRefPtr_h |
| #define WTF_ListRefPtr_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->hasOneRef()) |
| 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 // WTF_ListRefPtr_h |