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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2006-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.collection
import generic._
import mutable.Builder
/** A map whose keys are sorted.
*
* @author Sean McDirmid
* @author Martin Odersky
* @version 2.8
* @since 2.4
*/
trait SortedMap[A, +B] extends Map[A, B] with SortedMapLike[A, B, SortedMap[A, B]] {
/** Needs to be overridden in subclasses. */
override def empty: SortedMap[A, B] = SortedMap.empty[A, B]
override protected[this] def newBuilder: Builder[(A, B), SortedMap[A, B]] =
immutable.SortedMap.newBuilder[A, B]
}
/**
* @since 2.8
*/
object SortedMap extends SortedMapFactory[SortedMap] {
def empty[A, B](implicit ord: Ordering[A]): SortedMap[A, B] = immutable.SortedMap.empty[A, B](ord)
implicit def canBuildFrom[A, B](implicit ord: Ordering[A]): CanBuildFrom[Coll, (A, B), SortedMap[A, B]] = new SortedMapCanBuildFrom[A, B]
private[collection] trait Default[A, +B] extends SortedMap[A, B] {
self =>
override def +[B1 >: B](kv: (A, B1)): SortedMap[A, B1] = {
val b = SortedMap.newBuilder[A, B1]
b ++= this
b += ((kv._1, kv._2))
b.result
}
override def - (key: A): SortedMap[A, B] = {
val b = newBuilder
for (kv <- this; if kv._1 != key) b += kv
b.result
}
}
}
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