blob: 0d7b1b0d2324a3ebedef543ee8f2fd40d6877891 (
plain) (
tree)
|
|
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2010, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.collection
package immutable
import generic._
import mutable.{ArrayBuffer, Builder}
/** A subtrait of <code>collection.IndexedSeq</code> which represents sequences
* that cannot be mutated.
*
* @since 2.8
*/
trait IndexedSeq[+A] extends Seq[A]
with scala.collection.IndexedSeq[A]
with GenericTraversableTemplate[A, IndexedSeq]
with IndexedSeqLike[A, IndexedSeq[A]] {
override def companion: GenericCompanion[IndexedSeq] = IndexedSeq
}
/**
* @since 2.8
*/
object IndexedSeq extends SeqFactory[IndexedSeq] {
@serializable
class Impl[A](buf: ArrayBuffer[A]) extends IndexedSeq[A] {
def length = buf.length
def apply(idx: Int) = buf.apply(idx)
}
implicit def canBuildFrom[A]: CanBuildFrom[Coll, A, IndexedSeq[A]] = new GenericCanBuildFrom[A]
def newBuilder[A]: Builder[A, IndexedSeq[A]] = new ArrayBuffer[A] mapResult (buf => new Impl(buf))
}
|