[Trove4j-tracker] [ trove4j-Bugs-3509424 ] TIntObjectHashMap initial capacity wrong

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Bugs item #3509424, was opened at 2012-03-20 09:42
Message generated for change (Comment added) made by jparent
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Category: None
Group: None
>Status: Closed
Resolution: None
Priority: 5
Private: No
Submitted By: Fabrizio Pastore (fpastore)
>Assigned to: Johan Parent (jparent)
Summary: TIntObjectHashMap initial capacity wrong

Initial Comment:
Hi,

I noticed that the value passed to the initialCapacity attribute of TIntObjectHashMap constructor seems to not have any relationship with the value returned by method capacity(). Is this a bug or a feature?

Following lines show a failing test case:

TIntObjectHashMap tIntObjectHashMap0 = new TIntObjectHashMap(200, 2F, 300);
assertEquals(200, tIntObjectHashMap0.capacity()); //this test fails, 137 is returned instead of 200

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>Comment By: Johan Parent (jparent)
Date: 2012-03-20 22:50

Message:
Hi Fabrizio,

This does not appear to be a bug in this case. The capacity (~size of the
hash table) is always a prime in the trove implementation. The only
garuantee is that capacity >= initial_capacity/load_factor. But this is not
an obvious thing.

Regards,

Johan

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Comment By: Fabrizio Pastore (fpastore)
Date: 2012-03-20 09:46

Message:
I did not mention that I am using Trove as case study for a research
purposes on automatic test cases generation. So thanks in advance for your
reply.

Fabrizio

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