Common Lisp the Language, 2nd Edition

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28.1.10.3. Customizing Class Redefinition

Methods for update-instance-for-redefined-class may be defined to specify actions to be taken when an instance is updated. If only :after methods for update-instance-for-redefined-class are defined, they will be run after the system-supplied primary method for initialization and therefore will not interfere with the default behavior of update-instance-for-redefined-class. Because no initialization arguments are passed to update-instance-for-redefined-class when it is called by the system, the :initform forms for slots that are filled by :before methods for update-instance-for-redefined-class will not be evaluated by shared-initialize.

Methods for shared-initialize may be defined to customize class redefinition (see section 28.1.9.5).

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