[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 robeden
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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: Rob Eden (robeden)
Date: 2012-03-20 23:10

Message:
I wish we had automatic test case generation as we do with the basic code.
Our code coverage looks really pitiful because we tend to only cover
specific types of collections (for example int maps). Would be nice to
generate test cases for all collections to get at least basic coverage.

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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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You can respond by visiting: 
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