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Diffstat (limited to 'src/library/scalax/collection/immutable/EmptyMap.scala')
-rw-r--r-- | src/library/scalax/collection/immutable/EmptyMap.scala | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/library/scalax/collection/immutable/EmptyMap.scala b/src/library/scalax/collection/immutable/EmptyMap.scala new file mode 100644 index 0000000000..c04d988f08 --- /dev/null +++ b/src/library/scalax/collection/immutable/EmptyMap.scala @@ -0,0 +1,34 @@ +/* __ *\ +** ________ ___ / / ___ Scala API ** +** / __/ __// _ | / / / _ | (c) 2003-2009, LAMP/EPFL ** +** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ ** +** /____/\___/_/ |_/____/_/ | | ** +** |/ ** +\* */ + +// $Id: EmptyMap.scala 16893 2009-01-13 13:09:22Z cunei $ + + + +package scalax.collection.immutable + +/** This class implements empty immutable maps + * @author Martin Oderskty + * @version 1.0, 019/01/2007 + */ +@serializable +class EmptyMap[A, B] extends Map[A, B] { + + def size: Int = 0 + + def get(key: A): Option[B] = None + + def elements: Iterator[(A, B)] = Iterator.empty + + def update (key: A, value: B): Map[A, B] = new Map1(key, value) + + def - (key: A): Map[A, B] = this +} + + + |