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MJD was talking about Memoize. Here it is in Ruby:

module Memoize
  def memoize(func_name)
    cache = {}
    (class<<elf; self; end).send(:define_method, func_name) { |*args| 
      return cache[args] if cache.has_key? args
      cache[args] = super     
    }       
  end     
end

There’s a lot of code in the Perl Memoize module; maybe it does other things—I haven’t really looked. Oh, and here’s this Memoize module from RAA. I’m some months late. :-)

Here’s some pictures from Portland.