Scala example source code file (GenericParTemplate.scala)

This example Scala source code file (GenericParTemplate.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

annotation, cc, collection, combiner, genericcompanion, genericparmapcompanion, genericpartemplate, generictraversabletemplate, parallel, pariterable, q, v, y

The GenericParTemplate.scala Scala example source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2010-2013, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

package scala
package collection
package generic

import scala.collection.parallel.Combiner
import scala.collection.parallel.ParIterable
import scala.collection.parallel.ParMap
import scala.collection.parallel.TaskSupport

import scala.annotation.unchecked.uncheckedVariance
import scala.language.higherKinds

/** A template trait for collections having a companion.
 *
 *  @tparam A    the element type of the collection
 *  @tparam CC   the type constructor representing the collection class
 *  @author Aleksandar Prokopec
 *  @since 2.8
 */
trait GenericParTemplate[+A, +CC[X] <: ParIterable[X]]
extends GenericTraversableTemplate[A, CC]
   with HasNewCombiner[A, CC[A] @uncheckedVariance]
{
  def companion: GenericCompanion[CC] with GenericParCompanion[CC]

  protected[this] override def newBuilder: scala.collection.mutable.Builder[A, CC[A]] = newCombiner

  protected[this] override def newCombiner: Combiner[A, CC[A]] = {
    val cb = companion.newCombiner[A]
    cb
  }

  override def genericBuilder[B]: Combiner[B, CC[B]] = genericCombiner[B]

  def genericCombiner[B]: Combiner[B, CC[B]] = {
    val cb = companion.newCombiner[B]
    cb
  }

}


trait GenericParMapTemplate[K, +V, +CC[X, Y] <: ParMap[X, Y]] extends GenericParTemplate[(K, V), ParIterable]
{
  protected[this] override def newCombiner: Combiner[(K, V), CC[K, V]] = {
    val cb = mapCompanion.newCombiner[K, V]
    cb
  }

  def mapCompanion: GenericParMapCompanion[CC]

  def genericMapCombiner[P, Q]: Combiner[(P, Q), CC[P, Q]] = {
    val cb = mapCompanion.newCombiner[P, Q]
    cb
  }
}