--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/webengine/osswebengine/WebCore/rendering/DataRef.h	Mon Mar 30 12:54:55 2009 +0300
@@ -0,0 +1,103 @@
+/*
+ * This file is part of the DOM implementation for KDE.
+ *
+ * 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 Apple Computer, Inc.
+ *
+ * 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
+
+namespace WebCore {
+
+template <typename T> class DataRef {
+public:
+    DataRef()
+        : m_data(0)
+    {
+    }
+
+    DataRef(const DataRef<T>& d)
+    {
+        ASSERT(d.m_data);
+        m_data = d.m_data;
+        m_data->ref();
+    }
+
+    ~DataRef()
+    {
+        if (m_data)
+            m_data->deref();
+    }
+
+    const T* get() const { return m_data; }
+
+    T& operator*() const { return *m_data; }
+    const T* operator->() const { return m_data; }
+
+    T* access()
+    {
+        if (!m_data->hasOneRef()) {
+            m_data->deref();
+            m_data = new T(*m_data);
+            m_data->ref();
+        }
+        return m_data;
+    }
+
+    void init()
+    {
+        ASSERT(!m_data);
+        m_data = new T;
+        m_data->ref();
+    }
+
+    DataRef<T>& operator=(const DataRef<T>& d)
+    {
+        ASSERT(d.m_data);
+        d.m_data->ref();
+        if (m_data)
+            m_data->deref();
+        m_data = d.m_data;
+        return *this;
+    }
+
+    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:
+    T* m_data;
+};
+
+} // namespace WebCore
+
+#endif // DataRef_h