Re: Inheriting from foreign objects

[Neil Jerram]

>>>>> "Andreas" == Andreas Rottmann <address@hidden> writes:

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

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

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

I'd say you're in virgin territory here, and that any advice you can
give on such problems, and on defining a C API for GOOPS, would be
very useful.

(Sorry that wasn't much help!  Good luck.)

        Neil