From: "David A. Black" <dblack@...>
Date: 2009-07-17T21:05:25+09:00
Subject: Re: class.class = class

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Hi --

On Fri, 17 Jul 2009, Rubynewbie Rubynewbie wrote:

> I understand that when you define a new class it卒s an instance of
> Class...
>
> class Test
> end
>
> So you can treat "Test" as an object and asks its class :
>
> Test.class
>
> Class
>
>
> Is this Class itself an object ?
>
> Because when i do Class.class, ruby gives me 'Class'
>
> So is Class an instance of itself? I don卒t understand the logic behind
> this :(

Yes; Class is an instance of itself. Also, Object is an instance of
Class... but Class is a subclass of Object.

There's a bit of circularity at the top of the class/instance diagram,
in other words. It's all in the interest of bootstrapping the object
model into existence, so that everything fits in: classes (including
Class) are instances of Class; all classes descend from Object; etc.


David

-- 
David A. Black / Ruby Power and Light, LLC
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