Scala example source code file (GenericClassTagCompanion.scala)

This example Scala source code file (GenericClassTagCompanion.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*, builder, cc, classtag, coll, genericclasstagcompanion, reflection, traversable

The GenericClassTagCompanion.scala Scala example source code

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

package scala
package collection
package generic

import mutable.Builder
import scala.language.higherKinds
import scala.reflect.ClassTag

/** This class represents companions of classes which require ClassTags
 *  for their element types.
 *
 *  @author Aleksandar Prokopec
 */
abstract class GenericClassTagCompanion[+CC[X] <: Traversable[X]] {
  protected[this] type Coll = CC[_]

  def newBuilder[A](implicit ord: ClassTag[A]): Builder[A, CC[A]]

  def empty[A: ClassTag]: CC[A] = newBuilder[A].result()

  def apply[A](elems: A*)(implicit ord: ClassTag[A]): CC[A] = {
    val b = newBuilder[A]
    b ++= elems
    b.result()
  }
}