Scala example source code file (SeqFactory.scala)

This example Scala source code file (SeqFactory.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

cc, generictraversabletemplate, genseqfactory, seq, seqfactory, some, traversablefactory

The SeqFactory.scala Scala example source code

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



package scala
package collection
package generic
import scala.language.higherKinds

/** A template for companion objects of Seq and subclasses thereof.
 *
 *  @since 2.8
 */
abstract class SeqFactory[CC[X] <: Seq[X] with GenericTraversableTemplate[X, CC]]
extends GenSeqFactory[CC] with TraversableFactory[CC] {

  /** This method is called in a pattern match { case Seq(...) => }.
   *
   *  @param x the selector value
   *  @return  sequence wrapped in an option, if this is a Seq, otherwise none
   */
  def unapplySeq[A](x: CC[A]): Some[CC[A]] = Some(x)

}