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https://issues.apache.org/jira/browse/LANG-819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13863140#comment-13863140
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Matt Benson commented on LANG-819:
----------------------------------
I am sorry to contribute to anyone's impatience with Apache; however, let's
take this one step at a time. You said:
{quote}
My caller wants a static assertion that the (parent) routine will not modify
the collection
{quote}
I think by this you mean:
{quote}
My \[consuming code\] wants a \[compile-time\] assertion that the
\[{{EnumUtils#generateBitVector()}}\] routine will not modify the collection
{quote}
How does declaring the parameter as {{Iterable}}, even if it were raw, not
satisfy that requirement? (Once you cast to any other type, all bets are off
anyway.)
> EnumUtils.generateBitVector needs a "? extends"
> -----------------------------------------------
>
> Key: LANG-819
> URL: https://issues.apache.org/jira/browse/LANG-819
> Project: Commons Lang
> Issue Type: Bug
> Components: lang.*
> 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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