Common Lisp the Language, 2nd Edition

28.1.6. Generic Functions and Methods

A generic function is a function whose behavior depends on the classes or identities of the arguments supplied to it. The methods define the class-specific behavior and operations of the generic function. The following sections describe generic functions and methods.

• Introduction to Generic Functions
• Introduction to Methods
• Agreement on Parameter Specializers and Qualifiers
• Congruent Lambda-Lists for All Methods of a Generic Function
• Keyword Arguments in Generic Functions and Methods