From: tim <tim.wade@...>
Date: 2004-02-11T10:40:09+09:00
Subject: Re: running a class from the base class

Shashank Date wrote:
> "tim" <tim.wade@nautronix.com.au> wrote in message
> 
>>I currently have a number of derived classes that all
>>have something like:
>>
>>begin
>>   xx = SpecificArchitecture.new()
>>   xx.main(ARGV)
>>end
>>
>>at the end. Which i would like to remove.
> 
>    ^^^^^^^^
> If you always want to do this _at the end_ of your program,
> then take a look at the Kernel#at_exit {} method.
> 
> -- shanko
> 
> 
thanks -- yes after more spelunking through the test stuff we now have 
something like this:

============ file 1 ===========

require 'y'

class X < Y
    def blah
       print 'in blah'
    end
end

=========== file 2 ============

class Y
     def self.run()
         ::ObjectSpace::each_object(Class) do |class_object|
         # we only want classes that are above this one...
         if (Y > class_object)
             instance = class_object.new()
             instance.blah()
         end
     end
end

at_exit{ exit(Y.run()) }

==================================

I am sure that there are some subtly gothca's in this but it does mean 
that all of my X classes now don't have to have:

begin
    instance = X.new()
    instance.blah()
end

on them all. Theses are obviously much cut down examples -- there is a 
lot more cruft in all real implementations...