scala.collection.immutable.Seq.scala Maven / Gradle / Ivy

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/*
 * Scala (https://www.scala-lang.org)
 *
 * Copyright EPFL and Lightbend, Inc.
 *
 * Licensed under Apache License 2.0
 * (http://www.apache.org/licenses/LICENSE-2.0).
 *
 * See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.
 */

package scala
package collection
package immutable

import generic._
import mutable.Builder
import parallel.immutable.ParSeq

/** A subtrait of `collection.Seq` which represents sequences
 *  that are guaranteed immutable.
 *
 *  $seqInfo
 *  @define Coll `immutable.Seq`
 *  @define coll immutable sequence
 */
trait Seq[+A] extends Iterable[A]
//                      with GenSeq[A]
                      with scala.collection.Seq[A]
                      with GenericTraversableTemplate[A, Seq]
                      with SeqLike[A, Seq[A]]
                      with Parallelizable[A, ParSeq[A]]
{
  override def companion: GenericCompanion[Seq] = Seq
  override def toSeq: Seq[A] = this
  override def seq: Seq[A] = this
  protected[this] override def parCombiner = ParSeq.newCombiner[A] // if `immutable.SeqLike` gets introduced, please move this there!
}

/** $factoryInfo
 *  @define Coll `immutable.Seq`
 *  @define coll immutable sequence
 */
object Seq extends SeqFactory[Seq] {
  /** genericCanBuildFromInfo */
  implicit def canBuildFrom[A]: CanBuildFrom[Coll, A, Seq[A]] = ReusableCBF.asInstanceOf[GenericCanBuildFrom[A]]
  def newBuilder[A]: Builder[A, Seq[A]] = new mutable.ListBuffer
}