[Zope-dev] Subclassing ExtensionClass in C (this time with a solution)

[James Henstridge]

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Last week I asked a question about subclassing ExtensionClasses in C, but
no one seemed to know how to do it.  I then tried asking Jim Fulton about
it, but he hasn't responded yet.

So I decided to sit down and try to add the functionality myself.  I am
posting it here as some people on the list expressed an interest.  I have
tried to keep to the style of the current code, so those who have used
ExtensionClass should be able to do Extension Subclasses in C without too
much problem.  Also, the modification is backward compatible (both source
and binary), so it shouldn't break any current code.

The one place where the programmer has to be careful is in making the
size and layout of the instance structure of the new class is compatible
with its base classes.  I didn't include the checks done when subclassing
from python, as you may want to have more than one non-pure mixin base
class, or to extend the size of the instance structure in the subclass.

To define a new Extension Subclass, follow the same steps as for a normal
ExtensionClass, but instead of using PyExtensionClass_Export, use
PyExtensionClass_ExportSubclass.  This new function is similar to
PyExtensionClass_Export, except that it takes an extra argument -- a tuple
of base classes.  The function takes ownership of the tuple.

In cases where you only want to do single inheritance, there is a
convenience routine called PyExtensionClass_ExportSubclassSingle.  Its
last argument is the PyExtensionClass structure for the base class.

I have also attached a test module called TESC that tests out subclassing
in C.  Running it gives output something like:
>>> import TESC
>>> a = TESC.Cls()
>>> b = TESC.Subcls()
>>> a.m1(), a.m2()
('m1 of Cls called', 'm2 of Cls called')
>>> b.m1(), b.m2(), b.m3()
('m1 of Subcls called', 'm2 of Cls called', 'm3 of Subcls called')

I have tested this module a fair amount, and it doesn't seem to introduce
any problems with existing code, and is a fairly clean modification (I
could have made the change a little cleaner, but that would have broken
binary compatibility).  So I was wondering if my patch could be integrated
into the official ExtensionClass distribution.  I am sure it is of use to
more people than just me.

James.

--
Email: james@daa.com.au
WWW:   http://www.daa.com.au/~james/


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Content-Description: Test for Extension Subclasses

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