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From "Sebb (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LANG-588) Create a basic Pair<L, R> class
Date Sun, 07 Feb 2010 21:36:27 GMT

    [ https://issues.apache.org/jira/browse/LANG-588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830774#action_12830774
] 

Sebb commented on LANG-588:
---------------------------

The reason is visibility of the variable. 
There's no guarantee that a non-final variable set in one thread will be seen by other threads
in the absence of some form of synch.

It's unlikely that the problem will occur, but it's possible, and will be extremely hard to
track down if it does.

> Create a basic Pair<L, R> class
> -------------------------------
>
>                 Key: LANG-588
>                 URL: https://issues.apache.org/jira/browse/LANG-588
>             Project: Commons Lang
>          Issue Type: New Feature
>          Components: lang.*
>            Reporter: Matt Benson
>             Fix For: 3.0
>
>         Attachments: MatchedPair.java, MatchedPairTest.java, Pair.java, PairTest.java
>
>
> [lang] is the perfect place to provide a basic typed Pair class.  I have written such
a class for my employer (who hasn't?) but can/will rewrite blind to avoid IP issues.  I think
it's also nice to go ahead and extend this to MatchedPair<T> extends Pair<T, T>
as well.

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