On Feb 24, 2015, at 4:19 PM, Gregory Ewing <greg.ew...@canterbury.ac.nz> wrote:
> random...@fastmail.us wrote: >> On Tue, Feb 24, 2015, at 00:20, Gregory Ewing wrote: >>> 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. >> How does that help? Everywhere you would have had a reference to the >> "callback object", you now have a reference to the listener object. > > The point is that the library can keep a weak reference > to the listener object, whereas it can't reliably keep > a weak reference to a bound method. I think I see what you're talking about now. Does WeakMethod (https://docs.python.org/3/library/weakref.html#weakref.WeakMethod) solve this problem? Note that I can force my users to use the latest stable version of python at all times, so WeakMethod IS available to me. Thanks, Cem Karan -- https://mail.python.org/mailman/listinfo/python-list
