From: dblack@...
Date: 2007-02-15T12:19:13+09:00
Subject: Re: Creating a second instance of a singleton class?

Hi --

On Thu, 15 Feb 2007, ara.t.howard@noaa.gov wrote:

> On Thu, 15 Feb 2007, Steve Midgley wrote:
>
>> Another way to describe what I want to do:
>> 
>> 1) create a class "Test"
>> 2) create an instance of Test: "test1"
>> 3) modify test1's class definition, creating a singleton class
>> 4) Somehow "promote" or copy this singleton class to be a full fledged 
>> class as "Test2"
>> 5) Create an instance of "Test2" as "test2"
>
>  harp:~ > cat a.rb
>  require 'rubygems'
>  require 'prototype'

Are you sure you need those for your example?

>> I can't see why Ruby would object inherently to copying all the class 
>> methods of a singleton into a new class object (which is all I want - just 
>> a template of the singleton class's methods - no class variables or 
>> whatnot).
>
> you have to have the the class variables if you have class methods. 
> otherwise this
>
>  class C
>    @x = 42
>    def self.x() @x end
>  end
>
> won't work

That's not a class variable, though -- but I'm a bit confused by
Steve's reference to class methods.  Steve, why are you referring to
class methods? :-)


David

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