From: Paul Brannan <paul@...>
Date: 2002-03-21T05:31:35+09:00
Subject: Re: extending an exception

On Thu, Mar 21, 2002 at 02:04:10AM +0900, ts wrote:
>  When you write this ruby allocate a new exception object

Ah, that makes sense.  I've done the following now so that I can use the
same call to raise with an extended exception as I would with a normal
exception:

  module Exception_Data_Mixin
    attr_accessor :data
  
    def self.extend_object(obj)
      obj.instance_eval { @mesg = self.message }
      super(obj)
    end
  
    def exception(mesg=nil)
      @mesg = mesg.nil? ? self.message : mesg
      return self
    end
  
    def to_s
      return @mesg
    end
  
    alias_method :message, :to_s
  end

Thanks a bunch,

Paul