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I.e. transferring the state from one object to another object, which shares some (but not all) of the first object’s members.
I’m not applying this question to any real-life problem yet, but I guess I’m asking it to get a feel for the differences between the problem-solving approach in LISP as opposed to object-oriented languages like C#.
Just as an object is an instance of a class, a class is also an object, which is an instance of the (meta)class “class”. You can ask each of your classes for the list of it’s slot definitions and compare the two lists to find the commonalities.
http://www.lisp.org/mop/concepts.html