/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.collection.immutable
import scala.collection.generic.MapProxyTemplate
/** <p>
* This is a simple wrapper class for <a href="Map.html"
* target="contentFrame"><code>scala.collection.mutable.Map</code></a>.
* </p>
* <p>
* It is most useful for assembling customized map abstractions
* dynamically using object composition and forwarding.
* </p>
*
* @author Matthias Zenger, Martin Odersky
* @version 2.0, 31/12/2006
*/
trait MapProxy[A, +B] extends Map[A, B] with MapProxyTemplate[A, B, Map[A, B]]
{
override def thisCollection = this
private def newProxy[B1 >: B](newSelf: Map[A, B1]): MapProxy[A, B1] =
new MapProxy[A, B1] { val self = newSelf }
override def empty = newProxy(self.empty)
override def updated [B1 >: B](key: A, value: B1) = newProxy(self.updated(key, value))
override def + [B1 >: B](kv: (A, B1)): Map[A, B1] = newProxy(self + kv)
override def + [B1 >: B](elem1: (A, B1), elem2: (A, B1), elems: (A, B1) *) =
newProxy(self.+(elem1, elem2, elems: _*))
override def -(key: A) = newProxy(self - key)
}