Re: creating goops classes in C library wrappers

[Martin Soto <masoto@uniandes.edu.co>]

Mikael Djurfeldt <mdj@mdj-pc.nada.kth.se> writes:
> Klaus Schilling <Klaus.Schilling@home.ivm.de> writes:
> > This might influence guile-curses a lot, if one could define e.g a
> > <window> class, and many generic functions wrapping curses library
> > calls. It may be even better for libraries like gtk or some database
> > libraries.
> 
> Yes.  Also note the possibility not to implement the window as a smob
> but rather as a <foreign-object> (see undocumented example in
> goops-core/fdi.c).  A <foreign-object> is a lisp cell with a pointer
> to an arbitrary C struct in its CDR, just as a smob, so very little
> resources are spended.  It is possible to define accessors for the
> different fields in the struct on the C level.

What about defining goops methods from the C level as well?  From the
fdi.c example it seems clear that you can easily provide accesors to
the fields of the structure, but I can't see how to provide access to
the C functions that work on that structure.  Particularly, I would
like to be able to "define-generic" and "define-method" directly from
the C level, and in such a way that the newly defined method is
implemented in C.  Is that possible at all?

M. S.
------------
Martin A. Soto J.                           Profesor
Departamento de Ingenieria de Sistemas y Computacion
Universidad de los Andes      masoto@uniandes.edu.co