Common functionality shared between simple and targeted events.
     
    
    Methods
    
Method add_listener()
Add an event listener.
Usage
EventBase$add_listener(listener)
 
Arguments
- listener
- the function to be executed on the event, which takes a single
argument giving the time step when this event is triggered. 
 
 
Method clone()
The objects of this class are cloneable with this method.
Usage
EventBase$clone(deep = FALSE)
 
Arguments
- deep
- Whether to make a deep clone.