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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala
package collection
package immutable
import generic._
import mutable.{ArrayBuffer, Builder}
/** A subtrait of `collection.IndexedSeq` which represents indexed sequences
* that are guaranteed immutable.
* $indexedSeqInfo
*/
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
/** Returns this $coll as an indexed sequence.
*
* A new indexed sequence will not be built; lazy collections will stay lazy.
*/
@deprecatedOverriding("Immutable indexed sequences should do nothing on toIndexedSeq except cast themselves as an indexed sequence.", "2.11.0")
override def toIndexedSeq: IndexedSeq[A] = this
override def seq: IndexedSeq[A] = this
}
/** $factoryInfo
* The current default implementation of a $Coll is a `Vector`.
* @define coll indexed sequence
* @define Coll `IndexedSeq`
*/
object IndexedSeq extends IndexedSeqFactory[IndexedSeq] {
class Impl[A](buf: ArrayBuffer[A]) extends AbstractSeq[A] with IndexedSeq[A] with Serializable {
def length = buf.length
def apply(idx: Int) = buf.apply(idx)
}
def newBuilder[A]: Builder[A, IndexedSeq[A]] = Vector.newBuilder[A]
implicit def canBuildFrom[A]: CanBuildFrom[Coll, A, IndexedSeq[A]] =
ReusableCBF.asInstanceOf[GenericCanBuildFrom[A]]
}
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