From: Mark Probert <probertm@...>
Date: 2002-05-04T05:04:58+09:00
Subject: ruby idiom check


I have a class that telnets into a number of different
systems.  Each of these systems has it own set of defaults
such as ports, address, username, and so on.

The thought I had to abstract this was (1) to sub-class
or (2) to use Struct to contain the differences, a la:


SysDefs  = Struct::new(:name, :val)

$OneDef = SysDefs::new('type 1', 123)
$TwoDef = SysDefs::new('type 2', 234)

class BasicSys
     attr_reader :name, :val, :stuff

     def initialize(key=1)
         @def = SysDefs::new
         case key
         when 1
             @def = $OneDef
         when 2
             @def = $TwoDef
         end
         @name = @def.name
         @val  = @def.val
         @stuff = nil
     end
end

Any thoughts as to which is the preferred design choice
and why?



-mark

-----
Mark Probert
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Tel (613) 768-1082 (ESN: 398-1082)
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email: probertm@nortelnetworks.com