class Object
  def metaclass
    class << self
      self
    end
  end

  def meta_eval(&block)
    metaclass.instance_eval(&block)
  end

  def meta_def(name, &block)
    meta_eval { define_method(name, &block) }
  end

  def class_def(name, &block)
    class_eval { define_method(name, &block) }
  end
end