From: Josh Cheek <josh.cheek@...>
Date: 2011-12-21T13:34:16+09:00
Subject: Re: Accessing class instance variables from an instance?

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On Tue, Dec 20, 2011 at 9:42 PM, Khat Harr <myphatproxy@hotmail.com> wrote:

> Actually, now that I'm thinking about it the existing behavior sort of
> what makes more sense.  I'd think that subclasses would be better
> instantiating their own class vars rather than expecting a unique copy
> of the superclass var.  I can see why you'd want the class instance vars
> rather than modifying the existing mechanic.  On the other hand, maybe a
> new variable type to encapsulate the behavior of a class instance var in
> the way that it's being used here would be something worth discussing?
>
> --
> Posted via http://www.ruby-forum.com/.
>
>
I don't see any point in that, class ivars seem sufficient to me. What
would be nice, though, is an attr_accessor equivalent that defines methods
for both the class and instance.

(overly simple example)

class Class
  def whatever_accessor(meth_name)
    delegate_to_class meth_name
    singleton_class.instance_eval do
      attr_accessor meth_name
    end
  end

  def delegate_to_class(meth_name)
    define_method meth_name do |*args, &block|
      self.class.send meth_name, *args, &block
    end
  end
end

class Foo
  whatever_accessor :bar
  self.bar = :baz
end

Foo.new.bar # => :baz

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