From: Chris Gardner <chris.r.gardner@...>
Date: 2009-02-27T04:59:53+09:00
Subject: Re: Instance Variable Names Available from Class?

What I mean is that I would like to ask a class for the names of 
instance variables of its objects, which may have yet to be 
instantiated.

class Foo
  def intialize(bar, baz)
    @bar = bar
    @baz = baz
  end
end

I was trying to ask class Foo for the names @bar and @baz.  I've found 
out that these are accessible only through Foo instances.

I'm a Ruby newbie and am just today learning about Ruby's approach to 
metaprogramming.


Brian Candler wrote:
> Chris Gardner wrote:
>> In metaprogramming, I know how to get the instance variable names from
>> an Object (through instance_variables).  Is there a way to get them from
>> a Class?
> 
> A class *is* an object, with its own instance variables, and you can see 
> them in the same way:
> 
> class Foo
>   @bar = 123
> 
>   def self.flurble
>     @bar
>   end
> end
> 
> p Foo.instance_variables   # ["@bar"]
> 
> p Foo.flurble              # 123
> 
> Or did you mean something else?
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