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From Sébastien Brisard (JIRA) <j...@apache.org>
Subject [jira] [Commented] (MATH-786) "hashCode" in "Pair" class
Date Sat, 05 May 2012 14:01:50 GMT

    [ https://issues.apache.org/jira/browse/MATH-786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268964#comment-13268964
] 

Sébastien Brisard commented on MATH-786:
----------------------------------------

Is there really a way to make {{Pair}} immutable?
How about we write a big warning in the Javadoc that it is the reponsibility of the user to
make sure that objects passed to {{Pair}} are immutable.
I think we _must_ trust the user on this particular problem. As for internal uses of {{Pair}}
it is _our_ responsibility... I think we can take care of that!!!
                
> "hashCode" in "Pair" class
> --------------------------
>
>                 Key: MATH-786
>                 URL: https://issues.apache.org/jira/browse/MATH-786
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 3.0
>            Reporter: Gilles
>            Assignee: Gilles
>            Priority: Trivial
>             Fix For: 3.1
>
>
> Since "Pair" is supposed to be an immutable class, couldn't we cache the "hashCode" value
at construction? That would supposedly make it more efficient when used in maps.

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