From: Brian Candler <B.Candler@...>
Date: 2003-03-28T08:16:19+09:00
Subject: Re: How to call super with different arguments

> A similar result - adding a few methods and leaving everything else
> unchanged - can be obtained with singleton classes. How about this approach:

Actually that didn't work when case-sensitive was true, because of the loop
on <=>, but in this case you _can_ use super:

  def <=>(other)
    if @@intpattern =~ self && @@intpattern =~ other
      to_i <=> other.to_i
    elsif @@casesensitive
      super
    else
      downcase <=> other.downcase
    end
  end

Instead of 'super' you can do 'dup <=> other'. Note that 'downcase' also
duplicates the object: it's the same as dup.downcase!

It seems that duplicating an object of a singleton class gives you an object
of the original class, which is fortunately exactly what we needed. I
suppose if it didn't, it would no longer be a singleton :-)

Regards,

Brian.