Synch with 20010921

include/osg/Object

@@ -5,6 +5,16 @@
 
 namespace osg {
 
+/** META_Object macro define the standard clone, isSameKindAs and className methods.
+  * Use when subclassing from Object to make it more convinient to define 
+  * the standard pure virtual clone, isSameKindAs and className methods 
+  * which are required for all Object subclasses.*/
+#define META_Object(name) \
+        virtual Object* clone() const { return new name (); } \
+        virtual bool isSameKindAs(const Object* obj) const { return dynamic_cast<const name *>(obj)!=NULL; } \
+        virtual const char* className() const { return #name; }
+
+
 /** Base class/standard interface for objects which require IO support, 
     cloning and reference counting.
     Based on GOF Composite, Prototype and Template Method patterns.