From: Sean O'Halpin <sean.ohalpin@...>
Date: 2011-03-07T08:17:04+09:00
Subject: Re: How to get class of BasicObject ancestor (Ruby 1.9.2)?

> I'm not sure of a pure-ruby way to write #class,
> it's definitely written in C for the Object class.

Here's another attempt (this time handling inheritance):

module DefineClass
  def self.define_class(klass)
    klass.class_eval {
      define_method :class do
        klass
      end
    }
  end
  def self.extended(other)
    define_class(other)
  end
  def inherited(other)
    DefineClass.define_class(other)
  end
end

class SO < BasicObject
  extend ::DefineClass

  @@counter = 0
  def initialize(*a, &b)
    super
    @@counter += 1
  end

  def clone
    clone = self.class.new
  end

  def inspect
    "<#{self.class}: #{@@counter}>"
  end
end

s = SO.new
p s.clone
# => <SO: 2>

class BO < SO
end

b = BO.new
p b.clone
# => <BO: 4>

Regards,
Sean