From: Florian Frank <flori@...>
Date: 2006-07-31T08:12:51+09:00
Subject: Re: what is the scope of this object

Sch端le Daniel wrote:
> class Q
> @x=1
> end
> to whom does @x belong now?
Q.instance_variable_get :@x # => 1
> Does it make sense? (Usually one wants to create with @@ class 
> variables at this scope)
@@variables are shared across the whole class hierarchy. Often that is 
not what is wanted. IMHO they are rather useless.

Your @x from above is a class instance variable, a variable of the class 
object Q.

It's a good idea to use accessor methods to set/get its value.

class Q
  class << self
    attr_accessor :x
  end
  self.x = 0
end

Q.x # => 0
Q.x = 1
Q.x # => 1

-- 
Florian Frank