From: "Martin J. Dürst" <duerst@...>
Date: 2009-10-06T11:50:46+09:00
Subject: [ruby-core:25952] Re: Object#object_id can be duplicated for different objects

My guess is that this would need 4 bytes or so of additional memory per 
object.

Regards,   Martin.

On 2009/10/06 4:26, Howard Yeh wrote:
> Hi,
>
> I had a weird bug that took a long time to sort out because I naively
> thought Object#object_id would uniquely identify each Object.new
> instance. I am guessing MRI and YARV returns the address of the
> object. This means if an object gets recycled, that address could be
> reused, and the object_id repeated.
>
> It's understandable, but surprising.
>
> JRuby, on the other hand, returns a runtime counter as the object_id,
> just wondering if it would make sense to do something like that.
>
> Howard

-- 
#-# Martin J. D�rst, Professor, Aoyama Gakuin University
#-# http://www.sw.it.aoyama.ac.jp   mailto:duerst@it.aoyama.ac.jp