From: Paul Brannan <paul@...>
Date: 2001-12-18T02:39:14+09:00
Subject: [ruby-talk:28811] Re: Tracing instance variables

On Tue, Dec 18, 2001 at 01:51:16AM +0900, Jason Voegele wrote:
> Is there a better way to do this?  I know that global variables can be 
> traced for modification.  Is there some way to trace instance variables as 
> well, either in standard Ruby or any existing library?  I'm already using 
> AspectR for the binding, but I don't think it supports tracing instance 
> variables.

You can trace assignments to global variables, but you cannot trace
modifications of globals.  E.g.:

  trace_var :$foo, proc { |x| p x }
  $foo = "foo"
  $foo.sub!('f', 'b')

will print "foo" when the assignment is made, but will not print "boo"
when the modification is done.

Paul