Hi! When one uses ClasscallMetaclass for a class C and then defines a static method C.__classcall__, then creation of instances of C is done by this __classcall__. I just noticed that it is even possible that the resulting instances are not necessarily instances of C:
sage: from sage.misc.classcall_metaclass import ClasscallMetaclass sage: class A: ....: def __init__(self, n): ....: self.n = n ....: def __repr__(self): ....: return "A(%s)"%self.n ....: sage: class C: ....: __metaclass__ = ClasscallMetaclass ....: @staticmethod ....: def __classcall__(cls, *args, **kwds): ....: return A(*args, **kwds) ....: sage: C(4) A(4) sage: isinstance(_,C) False Do we want such a behaviour? Or should ClasscallMetaclass.__call__ do some assertion that makes sure that it can only return instances of the class in question? Best regards, Simon -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/groups/opt_out.
