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Scala example source code file (ImmutableSetAdaptor.scala)

This example Scala source code file (ImmutableSetAdaptor.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Scala tags/keywords

a, a, boolean, boolean, immutablesetadaptor, int, iterator, iterator, list, serializable, set, u, unit, unit

The Scala ImmutableSetAdaptor.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */



package scala.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
 */
class ImmutableSetAdaptor[A](protected var set: immutable.Set[A]) extends 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

  @deprecated("use `iterator' instead", "2.8.0")
  override def elements: Iterator[A] = 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 }

}

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