HN Theater @HNTheaterMonth

Peter Seibel talks about it in Practical Common Lisp and in the talk he had at Google about the book: https://youtu.be/VeAdryYZ7ak

The book is available online I think.

⬐ gpm

Thanks!

That is definitely an interesting concept.

Peter Seibel's talk "Practical Common Lisp"[1] covers that from a different angle, also comparing multiple dispatch with the visitor pattern.

[1] https://www.youtube.com/watch?v=VeAdryYZ7ak

⬐ eliben

Part 3 in the series (coming some time next week hopefully) shows how multiple dispatch is done in CLOS (Common Lisp) :-)

P.S. I love Seibel's PCL - great book

The author provides a good example of legitimate use of change-class with his compiler example.

About violating "some earlier architectural plan" in the case of libraries: Being able to do this allows CL programmers to freely mix libraries with different "architectural plans" without resorting to some half-baked fusion architecture that has to account for the different styles used by the libraries.

Last but not least, change-class is not a hack - it's behavior is well defined and documented. And when you consider that CL's "object orientation" is more generic that c++'s or java's, based on generic methods alone, inferring from c++- or java-paradigms to good CL style just does not work. Peter Seibel's talk "Practical Common Lisp" at google explains that pretty well: https://www.youtube.com/watch?v=VeAdryYZ7ak

I agree that my macros explanation was stretched. I simplified it too much.

Restarts are really nice, I first heard about them in "Practical Common Lisp" google talk: http://www.youtube.com/watch?v=VeAdryYZ7ak