[cells-devel] Lots of instances, callback when particular instance changes

[Josip Gracin]

Frank Goenninger wrote:
> You do - yet there is another approach I adopted from Kenny:

Thanks!  Now I have to spend some time examining stuff you've written 
that I've never heard of before (such as with-integrity...). :-)  Also, 
there doesn't seem to be anything named "defobserver" in the latest 
asdf-installable cells.  Has this become def-c-output perhaps?

Anyway, I was kind of trying to avoid sub-classing because I have lots 
of switches.  I'll have to re-think that decision.