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This is a base class used by other components to add/delete interest in watching the status of a component instance.
| ~InstanceWatcher () | ~InstanceWatcher | 
[virtual]
| void  instance_birth (const string& instance_name) | instance_birth | 
[pure virtual]
Inform the watcher that a component instance is alive.
Parameters:
| instance_name | the name of the instance that is alive. | 
| void  instance_death (const string& instance_name) | instance_death | 
[pure virtual]
Inform the watcher that a component instance is dead.
Parameters:
| instance_name | the name of the instance that is dead. |