From: Ilias Lazaridis <ilias@...>
Date: 2005-04-20T18:24:35+09:00
Subject: Re: [EVALUATION] - E03d - The Ruby Object Model (End Game)

Mark Hubbart wrote:
> On 4/19/05, Ilias Lazaridis <ilias@lazaridis.com> wrote:
> 
>>[EVALUATION] - E03c - The Ruby Object Model (Revised Documentation)
>>http://groups-beta.google.com/group/comp.lang.ruby/msg/b72b4a3bfd81a48e?hl=en
>>
>>-
>>
>>the above thread went a little out of control.
>>
>>The mostly discussed point (inherits from nil) has evolved and
>>
>>please focus on the essence:
>>
>>which is the term "metaclass"
>>
>>-
>>
>>cmd:> ri Class
>>
>>"Classes, modules, and objects are interrelated. In the diagram that
>>follows, the arrows represent inheritance, and the parentheses
>>meta-classes. All metaclasses are instances of the class `Class'."
>>
>>                           +------------------+
>>                           |                  |
>>             Object---->(Object)              |
>>              ^  ^        ^  ^                |
>>              |  |        |  |                |
>>              |  |  +-----+  +---------+      |
>>              |  |  |                  |      |
>>              |  +-----------+         |      |
>>              |     |        |         |      |
>>       +------+     |     Module--->(Module)  |
>>       |            |        ^         ^      |
>>  OtherClass-->(OtherClass)  |         |      |
>>                             |         |      |
>>                           Class---->(Class)  |
>>                             ^                |
>>                             |                |
>>                             +----------------+
>>
>>-
>>
>>The above documentation is false.
> 
> Not so. It is perhaps a bit unclear, but not incorrect. 
[...]

> I should also add my voice to the throng complaining about the
> 'Object.superclass == nil' issue. 
[...]

please.

The diagram has evolved in this point:

http://lazaridis.com/case/lang/ruby/

>>The mentioned metaclasses like "(Class)" are not existent and not
>>accessible whilst using standard Class/Object mechanisms.
[...]

>>If I am wrong, please show me how to access the metaclass:
>>
>>ClassMetaClass = Class.???
>>
>>ClassMetaClass.<class operations / access>
> 
> Class's metaclass is Class. 
[...]

"Class"  is the _class_ of "Class",  not its metaclass.

-

the above diagramm shows a "(Class)", which is documented as a "metaclass".

How do I access this class?

-

the above diagramm shows a "(Object)", which inherits from "Class".

how do I call "(Object).superclass"?

-

ruby is about fun and simplicity in programming?

so, please show me how to play with those "metaclasses".

[please without essay's]

..

-- 
http://lazaridis.com