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From "Matt Benson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LANG-819) EnumUtils.generateBitVector needs a "? extends"
Date Mon, 10 Sep 2012 16:48:08 GMT

    [ https://issues.apache.org/jira/browse/LANG-819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13452132#comment-13452132
] 

Matt Benson commented on LANG-819:
----------------------------------

Do you have any kind of evidence to support your claim that this is a "common idiom" on the
order of an unspoken rule?  Due to type erasure a change of this type _ought_ to be drop-in
compatible, but we'd need to be sure.  That hurdle cleared, I have no problem with this.
                
> EnumUtils.generateBitVector needs a "? extends"
> -----------------------------------------------
>
>                 Key: LANG-819
>                 URL: https://issues.apache.org/jira/browse/LANG-819
>             Project: Commons Lang
>          Issue Type: Bug
>    Affects Versions: 3.0.1
>            Reporter: Shevek
>            Priority: Minor
>
>     public static <E extends Enum<E>> long generateBitVector(Class<E>
enumClass, Iterable<E> values) {
> Should be Iterable<? extends E>.
> This is because although no subclasses of E can exist, the "? extends" is a common idiom
for marking the collection as readonly, or not "owned" by the current object.

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