[slime-devel] Re: Question about useage

[Christophe Rhodes]

Jeffrey Cunningham <jeffrey at cunningham.net> writes:

> This is probably a dumb question, but I haven't been able to figure it
> out yet. If I'm working with Slime and have defined some method
> functions for CLOS objects and want to change the number of arguments,
> when I go to compile one it objects with something like:
>
> "Attempt to add the method #<Standard-Method LIST-PARMS (TRACK-CLASS)
> {48BAC95D}> to the generic function #<Standard-Generic-Function LIST-PARMS (6)
> {484A09A1}>."
>
> I knew that. I was trying to change them all. Is there a way to clear
> the existence of these functions from lisp's "memory" and start over?
> Or do I have to kill the session and start it up again?

Methods are added to generic functions, unless their lambda lists are
not congruent.  To change a generic function's signature, redefine the
generic function using DEFGENERIC, or (a slightly bigger hammer)
remove the symbol naming the current one and recompile it and all its
callers.

Christophe