From: "David A. Black" <dblack@...>
Date: 2008-09-30T20:05:08+09:00
Subject: Re: extend keyword in class definition

Hi --

On Tue, 30 Sep 2008, ruud grosmann wrote:

> OK. I think now I get what you mean.
>
> To make sure I understood it right:
> my mistake was that there are both singleton methods on classes and
> singleton methods on instances of a class. Essentially the same,
> because classes are objects too. In this case, we're talking about
> singleton methods on the class WriterDecorator. This is done because
> the Forwardable method 'def_delegators' is used by the class object
> only, not by it's instances. Which would have been the case if
> Forwardable was mixed in.
> Please correct me if I'm wrong.

The only thing I'd add is that it's not really accurate to describe
methods defined in a module as "singleton methods" of an object that
extends itself with the module. A singleton method is really a method
defined in the object's singleton class itself.


David

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