From: Vl Online <vlonline@126.com>
Date: 2008-09-01T23:58:54+09:00
Subject: Re: Checking for 'nil' Class (not instance) variables?

> irb(main):031:0> @nosuchvar.nil?
> => true
> irb(main):032:0> @@nosuchvar.nil?
> NameError: uninitialized class variable @@nosuchvar in Object
>         from (irb):32
> irb(main):033:0>

Well, to query about class variables/methods, I would prefer to use 
class methods.

use self.class to get the class object of current instance, then query 
the class variables of this class using class_variable_defined? method.

irb(main):026:0> self.class.class_variable_defined? :@@nosuchvar
=> false
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