On 10.05.2012, at 19:05, Eliot Miranda wrote:

> 
> 
> On Thu, May 10, 2012 at 6:21 AM, Paul DeBruicker <pdebruic at gmail.com> wrote:
> On 05/10/2012 04:21 AM, Nicolas Cellier wrote:
> Sure, I already changed various Number>>hash and could as well change
> Point hash to follow recommendations from Andres valloud book hashing
> in smalltalk...
> 
> Nicolas
> 
> DateAndTime>>#hash could be changed to :
> 
> hash
>        ^ (jdn hashMultiply bitXor: seconds + offset asSeconds) bitXor: nanos
> 
> which is 130x faster than whats currently in the image:
> 
> hash
>        ^ self asUTC ticks hash
> 
> 
> The collision rate on the proposed hash function is 0.04% ( 4 per 10,000 )
> 
> Just doit.  Make that change.  If you don't have commit rights, commit it to inbox.  please!

But take care with rehashing existing sets/collections.

- Bert -


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