From: Peter Szinek <peter@...>
Date: 2007-11-09T19:00:11+09:00
Subject: Re: singleton is this easy?

Thufir wrote:
> Is this all that's required to ensure that there's ever only one
> instance of an ArrayOfCreatures?  Seems too easy!

You can also use the standard Ruby singleton implementation:

=============================================================
require 'singleton'

class SavageCrystalDragon
   include Singleton
end

scd = SavageCrystalDragon.instance
=============================================================

If you would try to scd.dup:

can't dup instance of singleton SavageCrystalDragon (TypeError)

HTH,
Peter
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