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/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* (C) 2000 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2003, 2005, 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 DataRef_h
#define DataRef_h
#include <wtf/PassRef.h>
#include <wtf/Ref.h>
namespace WebCore {
template <typename T> class DataRef {
public:
DataRef(PassRef<T> data) : m_data(WTF::move(data)) { }
DataRef(const DataRef& other) : m_data(const_cast<T&>(other.m_data.get())) { }
DataRef& operator=(const DataRef& other) { m_data = const_cast<T&>(other.m_data.get()); return *this; }
const T* get() const { return &m_data.get(); }
const T& operator*() const { return *get(); }
const T* operator->() const { return get(); }
T* access()
{
if (!m_data->hasOneRef())
m_data = m_data->copy();
return &m_data.get();
}
bool operator==(const DataRef<T>& o) const
{
return &m_data.get() == &o.m_data.get() || m_data.get() == o.m_data.get();
}
bool operator!=(const DataRef<T>& o) const
{
return &m_data.get() != &o.m_data.get() && m_data.get() != o.m_data.get();
}
private:
Ref<T> m_data;
};
} // namespace WebCore
#endif // DataRef_h
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