diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/library/scala/collection/immutable/Stream.scala | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/library/scala/collection/immutable/Stream.scala b/src/library/scala/collection/immutable/Stream.scala index d135bb29a8..db19df315f 100644 --- a/src/library/scala/collection/immutable/Stream.scala +++ b/src/library/scala/collection/immutable/Stream.scala @@ -1029,6 +1029,8 @@ sealed abstract class Stream[+A] extends AbstractSeq[A] */ override def stringPrefix = "Stream" + override def equals(that: Any): Boolean = + if (this eq that.asInstanceOf[AnyRef]) true else super.equals(that) } /** A specialized, extra-lazy implementation of a stream iterator, so it can @@ -1171,6 +1173,27 @@ object Stream extends SeqFactory[Stream] { tlVal } + + override /*LinearSeqOptimized*/ + def sameElements[B >: A](that: GenIterable[B]): Boolean = { + @tailrec def consEq(a: Cons[_], b: Cons[_]): Boolean = { + if (a.head != b.head) false + else { + a.tail match { + case at: Cons[_] => + b.tail match { + case bt: Cons[_] => (at eq bt) || consEq(at, bt) + case _ => false + } + case _ => b.tail.isEmpty + } + } + } + that match { + case that: Cons[_] => consEq(this, that) + case _ => super.sameElements(that) + } + } } /** An infinite stream that repeatedly applies a given function to a start value. |