Merge pull request #9466 from dwijnand/Iterator-addAll

Give Iterator.newBuilder an efficient addAll
scala · Feb 1, 2021 · 5b1d4f2 · 5b1d4f2
2 parents 7c736dc + 7b25684
commit 5b1d4f2
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/library/scala/collection/Iterator.scala b/src/library/scala/collection/Iterator.scala
@@ -991,7 +991,8 @@ object Iterator extends IterableFactory[Iterator] {
     */
   def newBuilder[A]: Builder[A, Iterator[A]] =
     new ImmutableBuilder[A, Iterator[A]](empty[A]) {
-      override def addOne(elem: A): this.type = { elems = elems ++ single(elem); this }
+      override def addOne(elem: A): this.type             = { elems ++= single(elem); this }
+      override def addAll(xs: IterableOnce[A]): this.type = { elems ++= xs.iterator;  this }
     }
 
   /** Creates iterator that produces the results of some element computation a number of times.