Re: insert classes?

[Danny Bobrow <bobrow@parc.xerox.com>]

    Date: Tue, 20 Mar 90 15:22:12 +0100
    From: "Petra Sommer" <petra@cs.uni-sb.de>

    Hi,

    maybe this is an old question:

    how can i insert a pcl-class into an existing class-hierarchy?
    e.g. class A supers class B, insert new class C
	 should lead to 
	 class A supers class C supers class B

    Thanks in advance
      Petra

Assume you had started with

(defclass a (b) ...)

...
Then 

Evaluate 
(defclass c (b) ...)

and then evaluate:

(defclass a (c) ...)

CLOS guarantees that the new definition will override the old one
and that instances of a will be updated to the new structure the
next time a method is called on them.