common lisp - Defining classes at runtime -

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i trying write function takes list of classes (or class names) , returns class has given classes superclasses. should return same class again when given same list twice, using hash table memoization. can not use defclass purpose doesn't evaluate it's direct-superclasses parameter. didn't find corresponding function in hyperspec. there way can portably?

just create defclass form , evaluate eval.

you can use clos function ensure-class.


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