From: Chris Pine <nemo@...>
Date: 2002-12-12T05:50:14+09:00
Subject: do I really not understand inheritance??

So, I've been really trying to get a firm understanding of objects and
classes in Ruby.  Just to make sure I understood what was what, though, I
wrote a program to test my understanding.

As I understand it, asking:

  obj.kind_of? mod

...is the same as asking:

  obj.class.ancestors.include? mod

So I tested every object-class pair which comes standard with Ruby.  It
failed on two of these pairs, both with the Enumerable module.  Here's the
fast version of the code, working only with Enumerable:

  def doIGetIt? (obj)
    (obj.kind_of?(Enumerable)) == (obj.class.ancestors.include?(Enumerable))
  end

  ObjectSpace.each_object do |obj1|
    if !doIGetIt? obj1
      puts obj1.kind_of?(Enumerable)
      puts obj1.class.ancestors.inspect
      puts obj1
      puts obj1.class
      puts obj1.inspect
      puts
    end
  end

So, I'm assuming that it fails for you, too.  What's the deal with the ENV
object?  And what is that other '-' object?

Chris