From: "Thomas B." <tpreal@...>
Date: 2008-09-01T22:10:03+09:00
Subject: Re: accessing instance variable

Robert Klemme wrote:
> You are not defining an instance variable of instances of O here but
> of O itself.  In other words this @b and the @b below have nothing to
> do with each other.

Exactly. And if you want to initialize @b for each new instance of O to 
the value of 0, you should write

class O
  def initialize
    @b = 0
  end
  def x=(a)
    @b = a
  end
  attr_reader :b
end

Now all new instances will have @b equal to 0. And the attr_reader is 
for reading the instance variables. In fact attr_reader :b is the same 
as writing explicitly

def b
  @b
end

TPR.
-- 
Posted via http://www.ruby-forum.com/.