new version of collection libraries

1 files changed, 47 insertions, 0 deletions

diff --git a/src/library/scalax/collection/immutable/Set2.scala b/src/library/scalax/collection/immutable/Set2.scala
new file mode 100755
index 0000000000..828c52d053
--- /dev/null
+++ b/src/library/scalax/collection/immutable/Set2.scala
@@ -0,0 +1,47 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Set1.scala 16893 2009-01-13 13:09:22Z cunei $
+
+
+
+package scalax.collection.immutable
+
+import collection.generic.Builder
+
+/** This class implements immutable sets with exactly one element.
+ *  @author  Martin Oderskty
+ *  @version 1.0, 019/01/2007
+ */
+@serializable
+class Set2[A](elem1: A, elem2: A) extends Set[A] {
+
+  def size: Int = 2
+
+  def contains(elem: A): Boolean =
+    elem == elem1 || elem == elem2
+
+  def + (elem: A): Set[A] =
+    if (contains(elem)) this
+    else new Set3(elem1, elem2, elem)
+
+  def - (elem: A): Set[A] =
+    if (elem == elem1) new Set1(elem2)
+    else if (elem == elem2) new Set1(elem1)
+    else this
+
+  def elements: Iterator[A] =
+    Iterator(elem1, elem2)
+
+  override def foreach(f: A => Unit): Unit = {
+    f(elem1); f(elem2)
+  }
+}
+
+
+