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Diffstat (limited to 'Source/WebCore/rendering/style/DataRef.h')
-rw-r--r-- | Source/WebCore/rendering/style/DataRef.h | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/Source/WebCore/rendering/style/DataRef.h b/Source/WebCore/rendering/style/DataRef.h new file mode 100644 index 0000000..c8d8072 --- /dev/null +++ b/Source/WebCore/rendering/style/DataRef.h @@ -0,0 +1,71 @@ +/* + * 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/RefPtr.h> + +namespace WebCore { + +template <typename T> class DataRef { +public: + 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(); + } + + void init() + { + ASSERT(!m_data); + m_data = T::create(); + } + + bool operator==(const DataRef<T>& o) const + { + ASSERT(m_data); + ASSERT(o.m_data); + return m_data == o.m_data || *m_data == *o.m_data; + } + + bool operator!=(const DataRef<T>& o) const + { + ASSERT(m_data); + ASSERT(o.m_data); + return m_data != o.m_data && *m_data != *o.m_data; + } + +private: + RefPtr<T> m_data; +}; + +} // namespace WebCore + +#endif // DataRef_h |