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author | Martin Odersky <odersky@gmail.com> | 2009-02-13 11:59:49 +0000 |
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committer | Martin Odersky <odersky@gmail.com> | 2009-02-13 11:59:49 +0000 |
commit | 04840e2ed4530df9a5ca59b984bf2b37a976dc70 (patch) | |
tree | 61394762e202f8ab60e0d3a8e8ac688404241bc3 /src/library/scalax/collection/immutable/Set4.scala | |
parent | 708baf94764e2a839e24ca6204060a8d0664d88c (diff) | |
download | scala-04840e2ed4530df9a5ca59b984bf2b37a976dc70.tar.gz scala-04840e2ed4530df9a5ca59b984bf2b37a976dc70.tar.bz2 scala-04840e2ed4530df9a5ca59b984bf2b37a976dc70.zip |
new version of collection libraries
Diffstat (limited to 'src/library/scalax/collection/immutable/Set4.scala')
-rwxr-xr-x | src/library/scalax/collection/immutable/Set4.scala | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/library/scalax/collection/immutable/Set4.scala b/src/library/scalax/collection/immutable/Set4.scala new file mode 100755 index 0000000000..bef1b6588d --- /dev/null +++ b/src/library/scalax/collection/immutable/Set4.scala @@ -0,0 +1,49 @@ +/* __ *\ +** ________ ___ / / ___ 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 Set4[A](elem1: A, elem2: A, elem3: A, elem4: A) extends Set[A] { + + def size: Int = 4 + + def contains(elem: A): Boolean = + elem == elem1 || elem == elem2 || elem == elem3 || elem == elem4 + + def + (elem: A): Set[A] = + if (contains(elem)) this + else new DefaultSet[A] + (elem1, elem2, elem3, elem4, elem) + + def - (elem: A): Set[A] = + if (elem == elem1) new Set3(elem2, elem3, elem4) + else if (elem == elem2) new Set3(elem1, elem3, elem4) + else if (elem == elem3) new Set3(elem1, elem2, elem4) + else if (elem == elem4) new Set3(elem1, elem2, elem3) + else this + + def elements: Iterator[A] = + Iterator(elem1, elem2, elem3, elem4) + + override def foreach(f: A => Unit): Unit = { + f(elem1); f(elem2); f(elem3); f(elem4) + } +} + + + |