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Diffstat (limited to 'src/library/scala/collection/immutable/Queue.scala')
-rw-r--r-- | src/library/scala/collection/immutable/Queue.scala | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/library/scala/collection/immutable/Queue.scala b/src/library/scala/collection/immutable/Queue.scala index 1dd0d7683a..240b5c899e 100644 --- a/src/library/scala/collection/immutable/Queue.scala +++ b/src/library/scala/collection/immutable/Queue.scala @@ -106,6 +106,15 @@ sealed class Queue[+A] protected(protected val in: List[A], protected val out: L case _ => super.:+(elem)(bf) } + override def ++[B >: A, That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[Queue[A], B, That]): That = { + if (bf eq Queue.ReusableCBF) { + val thatQueue = that.asInstanceOf[Queue[B]] + new Queue[B](thatQueue.in ++ (thatQueue.out reverse_::: this.in), this.out).asInstanceOf[That] + } else { + super.++(that)(bf) + } + } + /** Creates a new queue with element added at the end * of the old queue. * |