Proposal: JDK-8148917 Enhanced-For Statement Should Allow Streams
stuart.marks at oracle.com
Fri Mar 1 02:43:44 UTC 2019
Please review and comment on this proposal to allow Stream instances to be used
in enhanced-for ("for-each") loops.
Occasionally it's useful to iterate a Stream using a conventional loop. However,
the Stream interface doesn't implement Iterable, and therefore streams cannot be
used with the enhanced-for statement. This is a proposal to remedy that
situation by introducing a new interface IterableOnce that is a subtype of
Iterable, and then retrofitting the Stream interface to implement it. Other JDK
classes will also be retrofitted to implement IterableOnce.
Note, this changeset isn't ready to push yet. In particular, it has no tests
yet. However, the implementation is so simple that I figured I should include
it. Comments on the specification wording are also welcome.
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