From: "David A. Black" <dblack@...>
Date: 2008-04-11T07:21:34+09:00
Subject: Re: How can I demonstrate that weakref works in 1.9?

Hi --

On Fri, 11 Apr 2008, Dave Thomas wrote:

>
> For 1.8, I did
>
> require 'weakref'
> ref = "fol de rol"
> puts "Initial object is #{ref}"
> ref = WeakRef.new(ref)
> puts "Weak reference is #{ref}"
> ObjectSpace.garbage_collect
> puts "But then it is #{ref}"
>
> The last line raised an Illegal Reference exception, which I expected.
>
> In 1.9, however, no exception is thrown--the original object is returned.
>
> So, assuming Weakref works in 1.9, is there a clever way of demonstrating it?

I wanted to try this out and investigate but I can't seem to get the
exception out of 1.8:

$ ruby -v weakref.rb 
ruby 1.8.6 (2007-09-24 patchlevel 111) [universal-darwin9.0]
Initial object is fol de rol
Weak reference is fol de rol
But then it is fol de rol


David

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