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Practical Common Lisp by Peter Seibel

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CHAPTER 16Object Reorientation:Generic Functions

Because the invention of Lisp predated the rise of object-oriented programming by a couple decades,1 new Lispers are sometimes surprised to discover what a thoroughly object-oriented language Common Lisp is. Common Lisp's immediate predecessors were developed at a time when object orientation was an exciting new idea and there were many experiments with ways to incorporate the ideas of object orientation, especially as manifested in Smalltalk, into Lisp. As part of the Common Lisp standardization, a synthesis of several of these experiments emerged under the name Common Lisp Object System, or CLOS. The ANSI standard incorporated CLOS into the language, so it no longer really makes sense to speak ...

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