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
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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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