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# Memoize the method +name+. If +file+ is provided, then the method results # are stored on disk as well as in memory. def memoize(name, file=nil) cache = File.open(file, "rb"){ |io| Marshal.load(io) } rescue {} (class<<self; self; end).send(:define_method, name) do |*args| unless cache.has_key?(args) cache[args] = super File.open(file, "wb+"){ |f| Marshal.dump(cache, f) } if file end cache[args] end cache end

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