Sundance <sundance <at> ierne.eu.org> writes:
> This class behaves like weakref.ref, only for callables.
We use a variant of this idea in our app for observable callbacks:
class bound_ref(object):
def __init__(self, method, cb = None):
self.object = weakref_ref(method.im_self, cb)
self.func = method.im_func
self.cls = method.im_class
def __call__(self):
obj = self.object()
if obj is None:
return None
return new.instancemethod(self.func, obj, self.cls)
Obviously the usage of the above bound_ref is just for bound methods--but I
think using new.instancemethod is more correct than lazily grabbing the bound
method with getattr. The only issue remaining is to whip up a C implementation
:-) This is important enough that I'll try to look into it today, unless Phil
raises serious objections about its feasibility :P
>
> Might it be possible to have it used by PyQt for virtual methods?
>
> Thanks,
>
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