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


package scala.collection
package parallel.immutable






import scala.collection.GenSet
import scala.collection.immutable.Set
import scala.collection.generic._
import scala.collection.parallel.ParSetLike
import scala.collection.parallel.Combiner




/** An immutable variant of `ParSet`.
*
* @define Coll mutable.ParSet
* @define coll mutable parallel set
*/
trait ParSet[T]
extends collection/*.immutable*/.GenSet[T]
   with GenericParTemplate[T, ParSet]
   with parallel.ParSet[T]
   with ParIterable[T]
   with ParSetLike[T, ParSet[T], Set[T]]
{
self =>
  override def empty: ParSet[T] = ParHashSet[T]()

  override def companion: GenericCompanion[ParSet] with GenericParCompanion[ParSet] = ParSet

  override def stringPrefix = "ParSet"

  // ok, because this could only violate `apply` and we can live with that
  override def toSet[U >: T]: ParSet[U] = this.asInstanceOf[ParSet[U]]
}



/** $factoryInfo
* @define Coll mutable.ParSet
* @define coll mutable parallel set
*/
object ParSet extends ParSetFactory[ParSet] {
  def newCombiner[T]: Combiner[T, ParSet[T]] = HashSetCombiner[T]

  implicit def canBuildFrom[T]: CanCombineFrom[Coll, T, ParSet[T]] = new GenericCanCombineFrom[T]
}
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