diff options
Diffstat (limited to 'src')
-rw-r--r-- | src/library/scala/collection/immutable/Vector.scala | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/src/library/scala/collection/immutable/Vector.scala b/src/library/scala/collection/immutable/Vector.scala index d100bf93df..1a0ef5eee7 100644 --- a/src/library/scala/collection/immutable/Vector.scala +++ b/src/library/scala/collection/immutable/Vector.scala @@ -18,8 +18,14 @@ import scala.collection.parallel.immutable.ParVector /** Companion object to the Vector class */ object Vector extends SeqFactory[Vector] { + private[collection] class VectorReusableCBF extends GenericCanBuildFrom[Nothing] { + override def apply() = newBuilder[Nothing] + } + + lazy val VectorReusableCBF: GenericCanBuildFrom[Nothing] = new VectorReusableCBF + @inline implicit def canBuildFrom[A]: CanBuildFrom[Coll, A, Vector[A]] = - ReusableCBF.asInstanceOf[CanBuildFrom[Coll, A, Vector[A]]] + VectorReusableCBF.asInstanceOf[CanBuildFrom[Coll, A, Vector[A]]] def newBuilder[A]: Builder[A, Vector[A]] = new VectorBuilder[A] private[immutable] val NIL = new Vector[Nothing](0, 0, 0) @inline override def empty[A]: Vector[A] = NIL @@ -140,19 +146,19 @@ override def companion: GenericCompanion[Vector] = Vector // SeqLike api - @inline override def updated[B >: A, That](index: Int, elem: B)(implicit bf: CanBuildFrom[Vector[A], B, That]): That = { - // just ignore bf - updateAt(index, elem).asInstanceOf[That] + @inline override def updated[B >: A, That](index: Int, elem: B)(implicit bf: CanBuildFrom[Vector[A], B, That]): That = bf match { + case _: Vector.VectorReusableCBF => updateAt(index, elem).asInstanceOf[That] // just ignore bf + case _ => super.updated(index, elem)(bf) } - @inline override def +:[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Vector[A], B, That]): That = { - // just ignore bf - appendFront(elem).asInstanceOf[That] + @inline override def +:[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Vector[A], B, That]): That = bf match { + case _: Vector.VectorReusableCBF => appendFront(elem).asInstanceOf[That] // just ignore bf + case _ => super.+:(elem)(bf) } - @inline override def :+[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Vector[A], B, That]): That = { - // just ignore bf - appendBack(elem).asInstanceOf[That] + @inline override def :+[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Vector[A], B, That]): That = bf match { + case _: Vector.VectorReusableCBF => appendBack(elem).asInstanceOf[That] // just ignore bf + case _ => super.:+(elem)(bf) } override def take(n: Int): Vector[A] = { |