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Subject: Re: Design thought for callbacks
From: Cem Karan <cfkaran2@gmail.com>
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Date: Mon, 2 Mar 2015 06:04:33 -0500
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To: Ian Kelly <ian.g.kelly@gmail.com>
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Xref: csiph.com comp.lang.python:86719

On Feb 26, 2015, at 2:54 PM, Ian Kelly <ian.g.kelly@gmail.com> wrote:
> On Feb 26, 2015 4:00 AM, "Cem Karan" <cfkaran2@gmail.com> wrote:
> >
> >
> > On Feb 26, 2015, at 12:36 AM, Gregory Ewing =
<greg.ewing@canterbury.ac.nz> wrote:
> >
> > > Cem Karan wrote:
> > >> 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?
> > >
> > > Yes, that looks like it would work.
> >
> >
> > Cool!
>=20
> Sometimes I wonder whether anybody reads my posts. I suggested a =
solution involving WeakMethod four days ago that additionally extends =
the concept to non-method callbacks (requiring a small amount of extra =
effort from the client in those cases, but I think that is unavoidable. =
There is no way that the framework can determine the appropriate =
lifetime for a closure-based callback.)

I apologize about taking so long to reply to everyone's posts, but I've =
been busy at home.

Ian, it took me a while to do some research to understand WHY what you =
were suggesting was important; you're right about storing the object as =
well as the method/function separately, but I think that WeakMethod =
might solve that completely, correct?  Are there any cases where =
WeakMethod wouldn't work?

Thanks,
Cem Karan=