Scala example source code file (SeqForwarder.scala)

This example Scala source code file (SeqForwarder.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

a, a,b, b, boolean, collection, forwarding, genseq, immutable, int, iterator, seq, seqforwarder

The SeqForwarder.scala Scala example source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2013, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

package scala
package collection
package generic
import scala.collection._
import scala.collection.immutable.Range

/** This class implements a forwarder for sequences. It forwards
 *  all calls to a different sequence object except for
 *
 *    - `toString`, `hashCode`, `equals`, `stringPrefix`
 *    - `newBuilder`, `view`, `toSeq`
 *    - all calls creating a new sequence of the same kind
 *
 *  The above methods are forwarded by subclass `SeqProxy`.
 *
 *  @author  Martin Odersky
 *  @version 2.8
 *  @since   2.8
 */
@deprecated("Forwarding is inherently unreliable since it is not automated and new methods can be forgotten.", "2.11.0")
trait SeqForwarder[+A] extends Seq[A] with IterableForwarder[A] {

  protected override def underlying: Seq[A]

  override def length: Int = underlying.length
  override def apply(idx: Int): A = underlying.apply(idx)
  override def lengthCompare(len: Int): Int = underlying lengthCompare len
  override def isDefinedAt(x: Int): Boolean = underlying isDefinedAt x
  override def segmentLength(p: A => Boolean, from: Int): Int = underlying.segmentLength(p, from)
  override def prefixLength(p: A => Boolean) = underlying prefixLength p
  override def indexWhere(p: A => Boolean): Int = underlying indexWhere p
  override def indexWhere(p: A => Boolean, from: Int): Int = underlying.indexWhere(p, from)
  override def indexOf[B >: A](elem: B): Int = underlying indexOf elem
  override def indexOf[B >: A](elem: B, from: Int): Int = underlying.indexOf(elem, from)
  override def lastIndexOf[B >: A](elem: B): Int = underlying lastIndexOf elem
  override def lastIndexOf[B >: A](elem: B, end: Int): Int = underlying.lastIndexOf(elem, end)
  override def lastIndexWhere(p: A => Boolean): Int = underlying lastIndexWhere p
  override def lastIndexWhere(p: A => Boolean, end: Int): Int = underlying.lastIndexWhere(p, end)
  override def reverseIterator: Iterator[A] = underlying.reverseIterator
  override def startsWith[B](that: GenSeq[B], offset: Int): Boolean = underlying.startsWith(that, offset)
  override def startsWith[B](that: GenSeq[B]): Boolean = underlying startsWith that
  override def endsWith[B](that: GenSeq[B]): Boolean = underlying endsWith that
  override def indexOfSlice[B >: A](that: GenSeq[B]): Int = underlying indexOfSlice that
  override def indexOfSlice[B >: A](that: GenSeq[B], from: Int): Int = underlying.indexOfSlice(that, from)
  override def lastIndexOfSlice[B >: A](that: GenSeq[B]): Int = underlying lastIndexOfSlice that
  override def lastIndexOfSlice[B >: A](that: GenSeq[B], end: Int): Int = underlying.lastIndexOfSlice(that, end)
  override def containsSlice[B](that: GenSeq[B]): Boolean = underlying containsSlice that
  override def contains[A1 >: A](elem: A1): Boolean = underlying contains elem
  override def corresponds[B](that: GenSeq[B])(p: (A,B) => Boolean): Boolean = underlying.corresponds(that)(p)
  override def indices: Range = underlying.indices
}