1 files changed, 34 insertions, 0 deletions
diff --git a/sources/scala/collection/immutable/ListSet.scala b/sources/scala/collection/immutable/ListSet.scala
new file mode 100644
index 0000000000..970308db2c
--- /dev/null
+++ b/sources/scala/collection/immutable/ListSet.scala
@@ -0,0 +1,34 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003, LAMP/EPFL                  **
+**  __\ \/ /__/ __ |/ /__/ __ |                                         **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id$
+
+
+package scala;
+
+/** I promise, there will be some documentation soon! :-) Matthias
+ */
+class ListSet[A] extends MutableSet[A] {
+
+    protected var elems: List[A] = Nil;
+
+    def size: Int = elems.length;
+
+    def contains(elem: A): Boolean = elems.contains(elem);
+
+    def add(elem: A): Unit = if (!elems.contains(elem)) elems = elem :: elems;
+
+    def remove(elem: A): Unit = { elems = elems.filter(e => e != elem); }
+
+    def clear: Unit = { elems = Nil; }
+
+    def elements: Iterator[A] = elems.elements;
+
+    override def toList: List[A] = elems;
+
+}