|  | GL Studio C++ Runtime API
    | 
#include <disti_metadata.h>
 
  
| Public Member Functions | |
| virtual void | Call (DistiAttributeBase &attr)=0 | 
| virtual bool | IsValid () const =0 | 
Class used to call a callback method that takes a DistiAttributeBase
| 
 | pure virtual | 
Call the callback with the provided display event.
| attr | The attribute associated with this callback. | 
Implemented in AttributeResourceCallback< T >, AttributeMethodCallback< T >, and AttributeFnCallback.
| 
 | pure virtual | 
When IsValid is false, then this AttributeObserver can be deleted.
Implemented in AttributeMethodCallback< T >, AttributeResourceCallback< T >, and AttributeFnCallback.