Common Lisp the Language, 2nd Edition

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28.1.8.3. Standard Meta-objects

The Object System supplies a standard set of meta-objects, called standard meta-objects. These include the class standard-object and instances of the classes standard-method, standard-generic-function, and method-combination.

• The class standard-method is the default class of methods that are defined by the forms defmethod, defgeneric, generic-function, generic-flet, generic-labels, and with-added-methods.
• The class standard-generic-function is the default class of generic functions defined by the forms defmethod, defgeneric, generic-function, generic-flet, generic-labels, with-added-methods, and defclass.
• The class named standard-object is an instance of the class standard-class and is a superclass of every class that is an instance of standard-class except itself.
• Every method combination object is an instance of a subclass of the class method-combination.

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