11The Meta Object Protocol (MOP), which isn't part of the language standard but is supported by most Common Lisp implementations,
provides a function, class-prototype, that returns an instance of
a class that can be used to access class slots. 9One consequence of defining a SETF function--say,
(setf foo)--is that if you also define the corresponding accessor
function, foo in this case, you can use all the modify macros built
upon SETF, such as INCF, DECF, PUSH, and POP, on the new
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