#12894: Add classcall setter in ClasscallMetaclass
--------------------------------------------------+-------------------------
Reporter: nthiery | Owner: jason
Type: enhancement | Status:
needs_review
Priority: major | Milestone: sage-5.9
Component: misc | Resolution:
Keywords: classcall UniqueRepresentation | Work issues:
Report Upstream: N/A | Reviewers: Florent
Hivert
Authors: Nicolas M. Thiéry | Merged in:
Dependencies: | Stopgaps:
--------------------------------------------------+-------------------------
Comment (by nthiery):
Replying to [comment:6 hivert]:
> Replying to [comment:5 nthiery]:
> > Oops, I let that ticket die, whereas I need it soon in Sage for the
> > functorial constructions. Thanks for the reminder!
> >
> > If the property approach can be made to work, it sounds like the one
> > that encapsulates best the details of the caching of the resolution of
> > classcall. So I vote for it. Does it look feasible?
>
> See:
http://docs.cython.org/src/userguide/extension_types.html#properties
>
> We just need to check that we have a sufficiently recent Cython in Sage
and
> that this doesn't induce some unacceptable overhead.
I just looked at this, and it seems we can't make this approach work:
Indeed, even if we define __classcall__ as a property in
ClasscallMetaclass, any class C which will implement its own
__classcall__ will overwrite the property. But then,
C.__classcall__ = ... won't work ...
So at this point I'd go with just the _set_classcall approach, unless you
see a way out.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12894#comment:7>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac?hl=en.
For more options, visit https://groups.google.com/groups/opt_out.
