From: "Damián M. González" <lists@...>
Date: 2012-09-16T06:30:17+09:00
Subject: Re: Class variables or class singleton variables?

Jan E. wrote in post #1076186:
> Exactly. And the singleton class can also have its own methods and
> constants. In fact, the only relation to the original class is that the
> instance methods of the singleton class are the singleton methods of the
> original class (and vice versa). Apart from that it's a completely
> separate class.

 Well this is amazing, I've tried to understand what you say, you mean
this?:

class Foo; end

class << Foo
  attr_accessor :x
  @x = 1
  def lalala
    "lalala #{@x}"
  end
end

class Foo
  @x = 2
  def self.lelele
    "lelele #{@x}"
  end
end

irb(main):018:0* Foo.lalala
=> "lalala 2"
irb(main):019:0> Foo.lelele
=> "lelele 2"
irb(main):020:0> Foo.singleton_class.instance_variable_get :@x
=> 1

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