#15718: Implement the __init_extra__ protocol of categories for Cython classes.
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Reporter: nthiery | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.1
Component: categories | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by SimonKing):
It would probably be rather easy:
Currently, we only look into the mro of the class; if the class is a
Python class, then it is a subclass of the category's parent class (since
the quest for `__init_extra__` takes place after category initialisation).
But in the case of Cython class, we simply need to look explicitly into
''both'' the class' mro and the category's parent class' mro.
It would detect a lot of Cython classes in which the call to
`Parent.__init__` happens too early for `__init_extra__` to work... But
these would be exactly the classes that currently do not allow Python
subclasses.
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Ticket URL: <http://trac.sagemath.org/ticket/15718#comment:1>
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