diff options
Diffstat (limited to 'src/library/scala/collection/immutable/ListSet.scala')
| -rw-r--r-- | src/library/scala/collection/immutable/ListSet.scala | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/src/library/scala/collection/immutable/ListSet.scala b/src/library/scala/collection/immutable/ListSet.scala index adc975479a..d20e7bc6d2 100644 --- a/src/library/scala/collection/immutable/ListSet.scala +++ b/src/library/scala/collection/immutable/ListSet.scala @@ -11,8 +11,8 @@ package collection package immutable import generic._ -import scala.annotation.{tailrec, bridge} -import mutable.{ ListBuffer, Builder } +import scala.annotation.tailrec +import mutable.{Builder, ReusableBuilder} /** $factoryInfo * @define Coll immutable.ListSet @@ -32,8 +32,10 @@ object ListSet extends ImmutableSetFactory[ListSet] { * a time to a list backed set puts the "squared" in N^2. There is a * temporary space cost, but it's improbable a list backed set could * become large enough for this to matter given its pricy element lookup. + * + * This builder is reusable. */ - class ListSetBuilder[Elem](initial: ListSet[Elem]) extends Builder[Elem, ListSet[Elem]] { + class ListSetBuilder[Elem](initial: ListSet[Elem]) extends ReusableBuilder[Elem, ListSet[Elem]] { def this() = this(empty[Elem]) protected val elems = (new mutable.ListBuffer[Elem] ++= initial).reverse protected val seen = new mutable.HashSet[Elem] ++= initial @@ -65,8 +67,7 @@ object ListSet extends ImmutableSetFactory[ListSet] { * @define mayNotTerminateInf * @define willNotTerminateInf */ -@deprecatedInheritance("The semantics of immutable collections makes inheriting from ListSet error-prone.", "2.11.0") -class ListSet[A] extends AbstractSet[A] +sealed class ListSet[A] extends AbstractSet[A] with Set[A] with GenericSetTemplate[A, ListSet] with SetLike[A, ListSet[A]] @@ -179,6 +180,6 @@ class ListSet[A] extends AbstractSet[A] override def tail: ListSet[A] = self } - + override def toSet[B >: A]: Set[B] = this.asInstanceOf[ListSet[B]] } |