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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2010, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.collection
package generic
import mutable.{Builder, MapBuilder}
/** A template for companion objects of <code>mutable.Map</code> and
* subclasses thereof.
*
* @since 2.8
*/
abstract class MapFactory[CC[A, B] <: Map[A, B] with MapLike[A, B, CC[A, B]]] {
type Coll = CC[_, _]
def empty[A, B]: CC[A, B]
def apply[A, B](elems: (A, B)*): CC[A, B] = (newBuilder[A, B] ++= elems).result
def newBuilder[A, B]: Builder[(A, B), CC[A, B]] = new MapBuilder[A, B, CC[A, B]](empty[A, B])
class MapCanBuildFrom[A, B] extends CanBuildFrom[Coll, (A, B), CC[A, B]] {
def apply(from: Coll) = newBuilder[A, B]
def apply() = newBuilder
}
}
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