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| ANSI Common Lisp 4 Types and Classes 4.3 Classes 4.3.1 Introduction to Classes ### 4.3.1.1 Standard Metaclasses The object system provides a number of predefined metaclasses. These include the classes standard-class, built-in-class, and structure-class: The class standard-class is the default class of classes defined by defclass. The class built-in-class is the class whose instances are classes that have special implementations with restricted capabilities. Any class that corresponds to a standard type might be an instance of built-in-class. The predefined type specifiers that are required to have corresponding classes are listed in Figure 4.3.7 Integrating Types and Classes. It is implementation-dependent whether each of these classes is implemented as a built-in class. All classes defined by means of defstruct are instances of the class structure-class.

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