From: ts <decoux@...>
Date: 2002-03-21T02:04:10+09:00
Subject: Re: extending an exception

>>>>> "P" == Paul Brannan <paul@atdesk.com> writes:

P>       raise $!, $!.message, $!.backtrace

 When you write this ruby allocate a new exception object

P>   module Exception_Data_Mixin
P>     attr_accessor :data
P>   end

   module Exception_Data_Mixin
      attr_accessor :data
      def initialize(arg)
         super arg[0]
         @data = arg[1]
      end
   end

   begin
      begin
         raise 'Foo!'
      rescue RuntimeError
         $!.extend(Exception_Data_Mixin)
         $!.data = 42
         raise $!, [$!.message, $!.data], $!.backtrace
      end
   rescue RuntimeError
      p $!.data           #=> nil
      p $!.backtrace
   end


Guy Decoux