Resolving local variables in inherited classes

I'm working on Xine-bindings for pike and I've encountered a situation where I need to access variables in other objects, declared as CVAR in the cmod source.

My program structure looks like this

PIKECLASS Engine { PIKECLASS AudioPort program_flags PROGRAM_USES_PARENT; { CVAR int my_variable; }

PIKECLASS Stream program_flags PROGRAM_USES_PARENT; { PIKEFUN void create(object /*AudioPort object*/ ap) { /* Here I need to access ap->my_variable */ } } }

I've looked a bit at how I resolve the parent context in the inner classes, but I can't make it work for the ap-object.

I guess my question boils down to, how do I find out where the AudioPort local variables begin in ap->storage?