#13922: Avoid a regression in the creation of homsets
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Reporter: SimonKing | Owner: tbd
Type: defect | Status: needs_review
Priority: critical | Milestone: sage-5.6
Component: performance | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Simon King | Merged in:
Dependencies: #715 | Stopgaps:
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Comment (by SimonKing):
Question to Robert: Is it possible to use a metaclass in Cython?
I tried:
{{{
cdef class Test:
__metaclass__ = ClasscallMetaclass
@staticmethod
def __classcall__(cls,data):
print "classcall"
O = super(cls,cls).__new__(cls,data)
cls.__init__(O,data)
return O
def __init__(self, data):
print "init"
class Test2:
__metaclass__ = ClasscallMetaclass
@staticmethod
def __classcall__(cls,data):
print "classcall"
O = super(cls,cls).__new__(cls,data)
cls.__init__(O,data)
return O
def __init__(self, data):
print "init"
}}}
While I obtain
{{{
sage: Test2('bla')
classcall
init
<...Test2 object at 0x6128680>
}}}
I only get
{{{
sage: Test('bla')
init
<...Test object at 0x72eddc0>
}}}
with the Cython function. Hence, it compiles with the metaclass, but
apparently it has no effect.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13922#comment:21>
Sage <http://www.sagemath.org>
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