From: ara.t.howard@...
Date: 2005-12-17T02:29:25+09:00
Subject: Re: Smarter creation of redunant methods

On Sat, 17 Dec 2005, Caleb Tennis wrote:

>
>> you can certainly use metaprogramming here, but you could accomplish the
>> same
>> effect with far less code:
>
> My issue is that I've got other methods in the class that use these
> particular instance variables, and instead of refactoring all of them in
> one fell swoop I'm trying to go in smaller chunks.  Mostly because I'm
> working on the "production" system (long story), so if break anything I
> need to be able to roll it back quickly.

then something like


   class Coil
     class Error < StandardError; end

     class << self
       def coil_attr *list
         list.flatten.each do |a|
           module_eval <<-code
             def #{ a }_coil chan
               @#{ a }_coil[chan] or raise Error, "chan=\#{ chan }"
             end
           code
         end
       end
     end

     coil_attr %w( a b c x y z )

   end

hth.

-a
-- 
===============================================================================
| ara [dot] t [dot] howard [at] noaa [dot] gov
| all happiness comes from the desire for others to be happy.  all misery
| comes from the desire for oneself to be happy.
| -- bodhicaryavatara
===============================================================================