Frank Millman wrote:
"In order to inform users that certain bits of state have changed, I require
them to register a callback with my code."
This sounds to me like a pub/sub scenario. When a 'listener' object comes
into existence it is passed a reference to a 'controller' object that holds
state. It wants to be informed when the state changes, so it registers a
callback function with the controller.
Perhaps instead of registering a callback function, you
should be registering the listener object together with
a method name.
You can then keep a weak reference to the listener object,
since if it is no longer referenced elsewhere, it presumably
no longer needs to be notified of anything.
--
Greg
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