From: Trans <transfire@...>
Date: 2005-09-07T19:26:30+09:00
Subject: Re: memoize

>From Nano Methods (thanks to Robert Feldt)

 $MEMOIZE_CACHE = Hash.new

 class Module

  def memoize(*meths)
    meths.each do |meth|
      mc = $MEMOIZE_CACHE[meth] = Hash.new
      old = instance_method(meth)
      new = proc do |*args|
        if mc.has_key? args
          mc[args]
        else
          mc[args] = old.bind(self).call(*args)
        end
      end
      send(:define_method, meth, &new)
    end
  end

 end

(I'm doubtful of supporting an instance version.)

T.