From: Dave Thomas <Dave@...>
Date: 2000-11-03T01:32:44+09:00
Subject: [ruby-talk:6000] Re: Mem overhead of singleton (ProgRuby chapt 19 q)

Robert Feldt <feldt@ce.chalmers.se> writes:

> I've been working with class decoration a bit and find your piece on
> "Class and Module Definitions" interesting. However, my q to you and
> (possibly other Ruby gurus?) are what effect the "performance enhancement
> based on Tadayoshi Funaba's data module" has on the mem usage?

Yes, there is an overhead, although I'd have to do some digging to
find out exactly how great.

You could eliminate the singleton at the expense of an extra instance
variable by rewriting the methods as

   def <proxy method>
     if !@<name_defined>
       @name_defined = true
       @name_value = <original method>
     end
     @name_value
  end

but Funaba-san's technique is a lot more fun!


Regards

Dave