Inheriting from foreign objects

[Andreas Rottmann]

Hi!

I have run into a problem: I create classes from C (C++) using
scm_make_class(). These classes all get the SCM_CLASSF_FOREIGN bit set
to treat them as foreign objects (like invoke the constructor &
desctructor supplied). 

So far, so good. However, when I derive from these classes (on the
Scheme level), the new class has also the FOREIGN bit set (it's
inherited in scm_sys_inherit_magic_x(), AFAICT), but the constructor
set NULL, which causes %allocate-instance bails out when trying to
instantiate the class.

Is there a way I can cleanly derive from C-created classes?

BTW, I'm using the current CVS code.

Regards, Andy
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