[erlang-questions] erlang:phash2(make_ref(), 1 bsl 32)

Bob Ippolito <>
Thu May 8 06:25:42 CEST 2008


2008/5/7 Per Melin <>:
> I thought that would be the easiest way to generate an integer unique enough
> for my needs. But it seems to always repeat in 2^18 (262144) iterations.
>
> That is because #Ref<_._.X.Y> gives the same phash2 as #Ref<_._.X+1.Y> in
> any range between 2^20 and 2^32.
>
> Isn't that a little unfortunate?

You could always just use a random number...

crypto:rand_uniform(0, 1 bsl 32).

-bob



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