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Creating auxiliary methods and using method qualifiers

Mixin classes and auxiliary methods

Mixins are ordinary CLOS classes with useful values or methods that "mix in" some special behavior. They are generally not used alone, but add their specializations to another class. In Macintosh Common Lisp, they usually appear first in the class precedence list. The class that adds Fred behavior to a window or dialog item, fred-mixin, is a mixin.

Gettmg Started with MCL - 19 OCT 1996

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