Scala example source code file (ImmutableSetAdaptor.scala)

This example Scala source code file (ImmutableSetAdaptor.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

a, abstractset, adaptors, boolean, immutablesetadaptor, int, iterator, list, serializable, u, unit

The ImmutableSetAdaptor.scala Scala example source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2013, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

package scala
package collection
package mutable

/** This class can be used as an adaptor to create mutable sets from
 *  immutable set implementations. Only method `empty` has
 *  to be redefined if the immutable set on which this mutable set is
 *  originally based is not empty. `empty` is supposed to
 *  return the representation of an empty set.
 *
 *  @author  Matthias Zenger
 *  @version 1.0, 21/07/2003
 *  @since   1
 */
@deprecated("Adaptors are inherently unreliable and prone to performance problems.", "2.11.0")
class ImmutableSetAdaptor[A](protected var set: immutable.Set[A])
extends AbstractSet[A]
   with Set[A]
   with Serializable {

  override def size: Int = set.size

  override def isEmpty: Boolean = set.isEmpty

  def contains(elem: A): Boolean = set.contains(elem)

  override def foreach[U](f: A =>  U): Unit = set.foreach(f)

  override def exists(p: A => Boolean): Boolean = set.exists(p)

  override def toList: List[A] = set.toList

  override def toString = set.toString

  def iterator: Iterator[A] = set.iterator

  def +=(elem: A): this.type = { set = set + elem; this }

  def -=(elem: A): this.type = { set = set - elem; this }

  override def clear(): Unit = { set = set.empty }
}