On Wed, 2 Jun 2010, Henrik Sperre Johansen wrote:
On 02.06.2010 00:15, Alexandre Bergel wrote:
Hi!
Apparently in Pharo 1.1, hash values may be greater than 4096. What is the range of the hash values?
Cheers, Alexandre
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project Hash values could always be greater than 4096 :) Identity hashes can't, but they are scaled in 1.1, to avoid bad clustering
That's not true. You may be surprised, but the value of #identityHash can be any SmallInteger. Just try this: {SmallInteger minVal. SmallInteger maxVal} collect: #identityHash.
for objects not redefining hash. Basically they're multiplied by 2^18, which gives the largest possible range while still keeping all small integers. See ProtoObject>>identityHash for details, old identityHash is now basicIdentityHash.
This may cause compatibility problems for packages which implement custom hashes or custom hashed collections. I think Magma will be affected by this, though I didn't check the code. Levente
Cheers, Henry
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