built-in-class (ANSI and GNU Common Lisp Document)

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#### 4.4.8 built-in-class [System Class]

#### Class Precedence List::

built-in-class, class,

standard-object,

t

#### Description::

A built-in class is a class whose instances have restricted capabilities or special representations. Attempting to use defclass to define subclasses of a built-in class signals an error of type error. Calling make-instance to create an instance of a built-in class signals an error of type error. Calling slot-value on an instance of a built-in class signals an error of type error. Redefining a built-in class or using change-class to change the class of an instance to or from a built-in class signals an error of type error. However, built-in classes can be used as parameter specializers in methods.