/* | |
* 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(); | |
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; } | |
}; | |
// Remove inline for winscw compiler to prevent the compiler agressively resolving | |
// T::ref() in RefPtr<T>'s copy constructor. The bug is reported at: | |
// https://xdabug001.ext.nokia.com/bugzilla/show_bug.cgi?id=9812. | |
template <typename T> | |
#if !COMPILER(WINSCW) | |
inline | |
#endif | |
ListRefPtr<T>::~ListRefPtr() | |
{ | |
RefPtr<T> reaper = this->release(); | |
while (reaper && reaper->hasOneRef()) | |
reaper = reaper->releaseNext(); // implicitly protects reaper->next, then derefs reaper | |
} | |
template <typename T> inline T* getPtr(const ListRefPtr<T>& p) | |
{ | |
return p.get(); | |
} | |
} // namespace WTF | |
using WTF::ListRefPtr; | |
#endif // WTF_ListRefPtr_h |