From: James Coglan <jcoglan@...>
Date: 2008-09-30T18:31:17+09:00
Subject: Re: extend keyword in class definition

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>
> I am a bit surprised by the 'extend Forwardable' line. Can anybody
> explain me what this is? Is it the same as 'include Forwardable' or is
> it the same as 'class WriterDecorator < Forwardable'?


It's neither. extend() is method that all objects have (classes are objects
too). It takes the methods from a module (in this case Forwardable) and adds
them as singleton methods to the object. Forwardable contains the method
'def_delegators', which we see here has been added as a singleton method to
WriterDecorator.

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