Specifies that your object cannot be aggregated.
[in] The name of the class object you are defining as not aggregatable.
DECLARE_NOT_AGGREGATABLE causes CreateInstance to return an error (CLASS_E_NOAGGREGATION) if an attempt is made to aggregate onto your object.
By default, CComCoClass contains the DECLARE_AGGREGATABLE macro, which specifies that your object can be aggregated. To override this default behavior, include DECLARE_NOT_AGGREGATABLE in your class definition.