Common Lisp the Language, 2nd Edition
Next: Changing the Class
Up: Redefining Classes
Previous: Customizing Class Redefinition
![change_begin](gif/ch_begin.gif)
There are two allowed extensions to class redefinition:
- The Object System may be extended to permit the new class
to be an instance of a metaclass other than the metaclass of the
old class.
- The Object System may be extended to support an updating process
when either the old or the new class is an instance of a
class other than standard-class that is not a built-in class.
![change_end](gif/ch_end.gif)
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