From: Gennady <gfb@...>
Date: 2004-08-11T08:50:34+09:00
Subject: Re: Singleton class methods

David A. Black wrote:

> Hi --
> 
> On Wed, 11 Aug 2004, Gennady wrote:
> 
> 
>>>>At least for "def Foo.f1" and "class << Foo" it is not the same one: one 
>>>>holds "A=10" and another -- "A=20".
>>>
>>>
>>>But only one of them is a singleton class; the other is simply Foo
>>>itself :-) When you do def Foo.m, 'self' is Foo; but when you do class
>>
>>That's where a slight misunderstanding might have occurred: I was 
>>calling "Foo itself" an original singleton class (isn't it? ;-)), and 
>>the one created by "class << Foo" -- an anonymous singleton class of Foo 
>>(i omitted word "anonymous" from my original reply, sorry).
> 
> 
> I realize that we should probably be saying 'virtual class' instead of
> 'singleton class' (at least, that's what shows up in the error
> messages when you try to instantiate one) -- but either way, Foo isn't
> one :-)  It's just a regular class.
> 
> 
> David
> 
Hmm, I like "virtual class" much better. I used term "singleton" for 
describing Foo's class simply to reflect that there's only one instance 
of class "Class" representing "Foo". Seems like my terminology was 
misleading.

Gennady.