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https://github.com/flutter/flutter.git
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72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
/*
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* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
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* (C) 2000 Antti Koivisto (koivisto@kde.org)
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* (C) 2000 Dirk Mueller (mueller@kde.org)
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* Copyright (C) 2003, 2005, 2008 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef DataRef_h
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#define DataRef_h
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#include "wtf/RefPtr.h"
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namespace blink {
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template <typename T> class DataRef {
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public:
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const T* get() const { return m_data.get(); }
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const T& operator*() const { return *get(); }
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const T* operator->() const { return get(); }
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T* access()
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{
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if (!m_data->hasOneRef())
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m_data = m_data->copy();
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return m_data.get();
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}
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void init()
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{
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ASSERT(!m_data);
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m_data = T::create();
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}
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bool operator==(const DataRef<T>& o) const
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{
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ASSERT(m_data);
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ASSERT(o.m_data);
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return m_data == o.m_data || *m_data == *o.m_data;
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}
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bool operator!=(const DataRef<T>& o) const
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{
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ASSERT(m_data);
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ASSERT(o.m_data);
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return m_data != o.m_data && *m_data != *o.m_data;
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}
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private:
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RefPtr<T> m_data;
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};
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} // namespace blink
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#endif // DataRef_h
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