[Python-Dev] Weakref design questions (original) (raw)

David Abrahams dave@boost-consulting.com
18 Oct 2002 23:46:45 -0400

Brian Quinlan <brian@sweetapp.com> writes:

Martin wrote: > You don't have to add it to every method. You can perform the check in > tpgetattro before performing the method lookup.

That would be dangerous! See my original "more evil" example.

Yeah, doesn't work for that case.

> Alternatively, you can change the obtype of the object to simply drop

> the methods that are not available anymore. I like this strategy! But I still think that this is more painful/less elegant than using proxies.

I don't see how that works either. If you have two objects of the same type, they may die at different times. If the type drops its methods all the objects become disabled. Furthermore, I think it still doesn't help with "more evil", since nobody's touching the type at that point

-- David Abrahams dave@boost-consulting.com * http://www.boost-consulting.com

Building C/C++ Extensions for Python: Dec 9-11, Austin, TX http://www.enthought.com/training/building_extensions.html