author | Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com> |
Mon, 30 Mar 2009 12:54:55 +0300 | |
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/* |
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* This file is part of the DOM implementation for KDE. |
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* |
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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 Apple Computer, Inc. |
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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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namespace WebCore { |
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template <typename T> class DataRef { |
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public: |
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DataRef() |
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: m_data(0) |
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{ |
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} |
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|
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DataRef(const DataRef<T>& d) |
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{ |
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ASSERT(d.m_data); |
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m_data = d.m_data; |
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m_data->ref(); |
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} |
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|
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~DataRef() |
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{ |
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if (m_data) |
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m_data->deref(); |
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} |
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const T* get() const { return m_data; } |
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T& operator*() const { return *m_data; } |
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const T* operator->() const { return m_data; } |
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T* access() |
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{ |
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if (!m_data->hasOneRef()) { |
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m_data->deref(); |
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m_data = new T(*m_data); |
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m_data->ref(); |
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} |
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return m_data; |
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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 = new T; |
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m_data->ref(); |
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} |
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DataRef<T>& operator=(const DataRef<T>& d) |
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{ |
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ASSERT(d.m_data); |
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d.m_data->ref(); |
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if (m_data) |
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m_data->deref(); |
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m_data = d.m_data; |
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return *this; |
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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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T* m_data; |
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}; |
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} // namespace WebCore |
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#endif // DataRef_h |