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CLOS/MOP at Dynamic Languages Day
Created by stuart on: Sun, 18 Jun 2006 19:18:44 GMT, Last modification: Sun, 18 Jun 2006 19:18:44 GMT

Dynamic Languages Day @ Vrije Universiteit Brussel, February 13, 2006. Video available of Pascal Costanza presenting on CLOS, Generic Functions, and the Meta-Object Protocol.

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Generic Functions and the CLOS Metaobject Protocol (Pascal Costanza)

The Common Lisp Object System (CLOS) is unique in two ways.

This presentation introduces these two notions. The code for an interpreter for generic functions that performs selection and execution of methods will be developed live during the presentation. This will be followed by a discussion how that code can be extended to introduce, for example, multimethods and AOP-style advices, and a sketch how generic functions are implemented efficiently in the "real" world. In the second part, the extensibility of the CLOS MOP will be illustrated by implementing - live - the (hashtable-based) Python object model as a metaclass. Other practical extensions based on the CLOS MOP are also sketched, like object-relational mappings, interfaces to foreign-language objects, and domain-specific annotations in classes.

Biography: Pascal Costanza has a Ph.D. degree from the University of Bonn, Germany. His past involvements include specification and implementation of the languages Gilgul and Lava, and the design and application of the JMangler framework for load-time transformation of Java class files. He has also implemented ContextL, the first programming language extension for Context-oriented Programming based on CLOS, and aspect-oriented extensions for CLOS, which all heavily rely on the CLOS MOP. He is furthermore the initiator and lead of Closer, an open source project that provides a compatibility layer for the CLOS MOP across multiple Common Lisp implementations.


Video Recording | Learning | Meetings and Events | Brussels

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