diff options
Diffstat (limited to 'src/library/scala/collection/immutable/Queue.scala')
| -rw-r--r-- | src/library/scala/collection/immutable/Queue.scala | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/library/scala/collection/immutable/Queue.scala b/src/library/scala/collection/immutable/Queue.scala index 0daa31af77..343c4d2779 100644 --- a/src/library/scala/collection/immutable/Queue.scala +++ b/src/library/scala/collection/immutable/Queue.scala @@ -25,6 +25,7 @@ object Queue { * @version 1.0, 08/07/2003 */ @serializable +@SerialVersionUID(-7622936493364270175L) class Queue[+A] protected( protected val in: List[A], protected val out: List[A]) extends Sequence[A] @@ -110,7 +111,7 @@ class Queue[+A] protected( def dequeue: (A, Queue[A]) = out match { case Nil if !in.isEmpty => val rev = in.reverse ; (rev.head, new Queue(Nil, rev.tail)) case x :: xs => (x, new Queue(in, xs)) - case _ => throw new NoSuchElementException("queue empty") + case _ => throw new NoSuchElementException("dequeue on empty queue") } /** Returns the first element in the queue, or throws an error if there @@ -122,7 +123,7 @@ class Queue[+A] protected( def front: A = if (!out.isEmpty) out.head else if (!in.isEmpty) in.last - else throw new NoSuchElementException("queue empty") + else throw new NoSuchElementException("front on empty queue") /** Returns a string representation of this queue. */ |