Patman64 3490d21bcd Make the register functions optionally return a cancel callback. ...

It's now possible to have complete flexibility with cancelling bindings,
i.e. it's possible to re-implement all of the other ways to cancel bindings
using the callback.

This sytem has been designed with complete safety in mind:
 - It is safe to call the callback more than once (does nothing after the
   first call).
 - The callback does not expire, and can be stored for as long as
   necessary.
 - If a callback is returned, there is no other way to cancel the binding
   (again, due to safety).

2015-05-01 20:29:48 -04:00

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