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/*
* 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
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