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These are object callbacks that are only dispatched if target of callback is non-null.
| SafeCallbackBase (CallbackSafeObject* o) | SafeCallbackBase | 
Constructor.
Informs CallbackSafeObject that this callback operates on it.
| ~SafeCallbackBase () | ~SafeCallbackBase | 
Destructor.
Informs CallbackSafeObject that is tracking callback instances that this callback no longer exists.
| void  invalidate () | invalidate | 
| bool  valid () | valid | 
[const]
| SafeCallbackBase () | SafeCallbackBase | 
[protected]
| SafeCallbackBase (const SafeCallbackBase&) | SafeCallbackBase | 
[protected]
| SafeCallbackBase&  operator= (const SafeCallbackBase&) | operator= | 
[protected]
| CallbackSafeObject* _cso | _cso | 
[protected]