From: Ken Bloom <kbloom@...>
Date: 2007-08-19T12:39:57+09:00
Subject: Re: Ruby's equivalent to Java's "interface"

On Sun, 19 Aug 2007 11:17:07 +0900, Olivier Renaud wrote:

> Note that the method 'quack' from class 'Squeek' replaces the definition
> of the method 'quack' that was first included from 'QuakeBehavior'. If
> you use this technique, you will be warned by a NotImplementedError (so,
> at runtime), if you forgot to define a method in classes that include
> QuakeBehavior. I don't think it is a good design, but maybe it can help.

You get two differences when you do this: one is that  
NotImplementedError rather than a NameError -- that's probably not too 
important. The other is that you can use is_a? and case statements to 
match QuakeBehavior.

--Ken

-- 
Ken Bloom. PhD candidate. Linguistic Cognition Laboratory.
Department of Computer Science. Illinois Institute of Technology.
http://www.iit.edu/~kbloom1/