#12895: Categories: adds support for SubcategoryMethods
-------------------------------------+--------------------------------------
Reporter: nthiery | Owner: nthiery
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.10
Component: categories | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Nicolas M. Thiéry | Merged in:
Dependencies: #11935, #12894 | Stopgaps:
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Comment (by nthiery):
Replying to [comment:8 SimonKing]:
> I see that for `class Category_singleton(Category)`, you replace
> {{{
> @lazy_class_attribute
> def __classcall__(object cls):
> }}}
> by
> {{{
> @staticmethod
> def __classcall__(object cls):
> }}}
>
> The point is that you do
`obj.__class__._set_classcall(ConstantFunction(obj))`, so that the lazy
class attribute is not needed, right? Just to make sure I understand what
you did.
That's right. If I remember well (that was one year ago), the tricky part
is to have the classcall setting work properly both for the original class
and its dynamic subclass. And having __classcall__ be a static method
deviates a bit less from the standard UniqueRepresentation idiom.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12895#comment:13>
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