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/* __ *\
** ________ ___ / / ___ 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)
}
}
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