1 files changed, 48 insertions, 0 deletions
diff --git a/src/library/scalax/collection/mutable/HashSet.scala b/src/library/scalax/collection/mutable/HashSet.scala
new file mode 100644
index 0000000000..601d0885c0
--- /dev/null
+++ b/src/library/scalax/collection/mutable/HashSet.scala
@@ -0,0 +1,48 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: HashSet.scala 16893 2009-01-13 13:09:22Z cunei $
+
+
+package scalax.collection.mutable
+
+import generic.{SetTemplate, SetFactory, AddableBuilder}
+
+/** Factory object for `HashSet` class */
+object HashSet extends SetFactory[HashSet] {
+  /** The empty set of this type */
+  def empty[A] = new HashSet[A]
+}
+
+/** This class implements mutable sets using a hashtable.
+ *
+ *  @author  Matthias Zenger
+ *  @author  Martin Odersky
+ *  @version 2.0, 31/12/2006
+ */
+@serializable
+class HashSet[A]
+  extends Set[A]
+     with SetTemplate[HashSet, A]
+     with FlatHashTable[A] {
+
+  def contains(elem: A): Boolean = containsEntry(elem)
+
+  def +=(elem: A) { addEntry(elem) }
+
+  def -=(elem: A) { removeEntry(elem) }
+
+  override def clear() = super.clear()
+
+  override def newBuilder[B]: generic.Builder[HashSet, B] =
+    new AddableBuilder[HashSet, B](HashSet.empty)
+
+  override def clone(): HashSet[A] = new HashSet[A] ++ this
+}
+
+