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author | Adriaan Moors <adriaan@lightbend.com> | 2017-02-07 17:27:58 -0800 |
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committer | GitHub <noreply@github.com> | 2017-02-07 17:27:58 -0800 |
commit | 40236b0378c597858d666beb4d38977b520df9e7 (patch) | |
tree | 18574ef3050debd6c09bf73da509bb06125b3250 /src/library | |
parent | 575c342039475d3c319487da81df5654ecf1127d (diff) | |
parent | 409f84d29f1dfae112a024d90aeb187248d48a3c (diff) | |
download | scala-40236b0378c597858d666beb4d38977b520df9e7.tar.gz scala-40236b0378c597858d666beb4d38977b520df9e7.tar.bz2 scala-40236b0378c597858d666beb4d38977b520df9e7.zip |
Merge pull request #5579 from edmundnoble/queue-concat
Improve Queue.++ when building another Queue
Diffstat (limited to 'src/library')
-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. * |