scala.collection.immutable.SetProxy.scala Maven / Gradle / Ivy
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Standard library for the Scala Programming Language
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.collection
package immutable
/** This is a simple wrapper class for `scala.collection.immutable.Set`.
*
* It is most useful for assembling customized set abstractions
* dynamically using object composition and forwarding.
*
* @tparam A type of the elements contained in this set proxy.
*
* @since 2.8
*/
trait SetProxy[A] extends Set[A] with SetProxyLike[A, Set[A]] {
override def repr = this
private def newProxy[B >: A](newSelf: Set[B]): SetProxy[B] =
new AbstractSet[B] with SetProxy[B] { val self = newSelf }
override def empty = newProxy(self.empty)
override def + (elem: A) = newProxy(self + elem)
override def - (elem: A) = newProxy(self - elem)
}