Scala example source code file (SortedMapFactory.scala)

This example Scala source code file (SortedMapFactory.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, b, canbuildfrom, cc, coll, mapbuilder, ordering, sortedmap, sortedmapfactory, sortedmaplike

The SortedMapFactory.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, MapBuilder}
import scala.language.higherKinds

/** A template for companion objects of mutable.Map and subclasses thereof.
 *
 *  @since 2.8
 */
abstract class SortedMapFactory[CC[A, B] <: SortedMap[A, B] with SortedMapLike[A, B, CC[A, B]]] {

  type Coll = CC[_, _]

  def empty[A, B](implicit ord: Ordering[A]): CC[A, B]

  def apply[A, B](elems: (A, B)*)(implicit ord: Ordering[A]): CC[A, B] = (newBuilder[A, B](ord) ++= elems).result()

  def newBuilder[A, B](implicit ord: Ordering[A]): Builder[(A, B), CC[A, B]] =
    new MapBuilder[A, B, CC[A, B]](empty(ord))

  class SortedMapCanBuildFrom[A, B](implicit ord: Ordering[A]) extends CanBuildFrom[Coll, (A, B), CC[A, B]] {
    def apply(from: Coll) = newBuilder[A, B](ord)
    def apply() = newBuilder[A, B]
  }
}