1 files changed, 71 insertions, 0 deletions
diff --git a/src/3rdparty/webkit/WebCore/rendering/style/DataRef.h b/src/3rdparty/webkit/WebCore/rendering/style/DataRef.h
new file mode 100644
index 0000000..c8d8072
--- /dev/null
+++ b/src/3rdparty/webkit/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