scala.collection.immutable.SetProxy.scala Maven / Gradle / Ivy
/*
* Scala (https://www.scala-lang.org)
*
* Copyright EPFL and Lightbend, Inc.
*
* Licensed under Apache License 2.0
* (http://www.apache.org/licenses/LICENSE-2.0).
*
* See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
package scala
package 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
*/
@deprecated("proxying is deprecated due to lack of use and compiler-level support.", "2.11.0")
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)
}