[squeak-dev] #= ==> #hash issues

Chris Cunningham cunningham.cb at gmail.com
Fri Nov 2 14:44:00 UTC 2018


ParcPlace-Digitalk VSE 3.1 (roughly 1999):

(0 to: 1) = (0 to: 5/3). "true"
(0 to: 1) hash = (0 to: 5/3) hash. "true"

So, ancient VSE and current VisualWorks are consistent, and agree on where
they want to be.  This is also the direction I want to take Squeak.
VA is also consistent, but #= doesn't match any other Smalltalk varient
that we've looked at.
Squeak, Pharo, Dolphin all currently have the same answer, but are not
consistent.

Interesting indeed.

thanks,
cbc

On Thu, Nov 1, 2018 at 5:40 AM Louis LaBrunda <Lou at keystone-software.com>
wrote:

> Hi Benoit,
>
> On the latest version of VA Smalltalk:
>
> VA Smalltalk V9.1 (32-bit); Image: 9.1 [413]
> VM Timestamp: 4.0, 10/01/18 (100)
>
> I see:
>
> (0 to: 1) = (0 to: 5/3). "false"
> (0 to: 1) hash = (0 to: 5/3) hash. "true"
>
> Very interesting.
>
> Lou
>
>
> On Thu, 1 Nov 2018 02:40:00 +0000 (UTC), Benoit St-Jean via Squeak-dev <
> squeak-dev at lists.squeakfoundation.org> wrote:
>
> >Interesting!
> >
> >As a comparison:
> >Squeak 5.2
> >(0 to: 1) = (0 to: 5/3). "true"(0 to: 1) hash = (0 to: 5/3) hash. "false"
> >Dolphin 7(0 to: 1) = (0 to: 5/3). "true"(0 to: 1) hash = (0 to: 5/3)
> hash. "false"
> >VisualWorks 8.1.1(0 to: 1) = (0 to: 5/3). "true"
> >(0 to: 1) hash = (0 to: 5/3) hash. "true"
> >Pharo 5.0(0 to: 1) = (0 to: 5/3). "true"
> >(0 to: 1) hash = (0 to: 5/3) hash. "false"
> >
> >I don't have VAST installed on the PC I'm using right now.  I'd be
> curious to see how other Smalltalk and/or GemStone handle this?  So far
> (according to what I could test, only VW is right (according to the ANSI
> standard and just plain logic!)
> >
> >I wonder how much code relies on this "behavior" out there!
> >But the ANSI Smalltalk draft is very clear on this (revision 1.9, page
> 53, http://wiki.squeak.org/squeak/uploads/172/standard_v1_9-indexed.pdf):
> >"If the value of receiver = comparand is true then the receiver and
> comparand *must* have equivalent hash values."
> >That's what I always thought (or was taught or even read in the Blue
> Book).  Was this something that was changed at some point???
> >
> >----------------
> >Benoît St-Jean
> >Yahoo! Messenger: bstjean
> >Twitter: @BenLeChialeux
> >Pinterest: benoitstjean
> >Instagram: Chef_Benito
> >IRC: lamneth
> >Blogue: endormitoire.wordpress.com
> >"A standpoint is an intellectual horizon of radius zero".  (A. Einstein)
> --
> Louis LaBrunda
> Keystone Software Corp.
> SkypeMe callto://PhotonDemon
>
>
>
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