Design thought for callbacks

[Gregory Ewing]

Cem Karan wrote:
> I tend to structure my code as a tree or DAG of objects.  The owner refers to
> the owned object, but the owned object has no reference to its owner.  With
> callbacks, you get cycles, where the owned owns the owner.

This is why I suggested registering a listener object
plus a method name instead of a callback. It avoids that
reference cycle, because there is no long-lived callback
object keeping a reference to the listener.

-- 
Greg