Scala example source code file (TraversableForwarder.scala)

This example Scala source code file (TraversableForwarder.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, array, b, boolean, collection, int, option, ordering, reflection, string, stringbuilder, u

The TraversableForwarder.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 mutable.{ Buffer, StringBuilder }
import immutable.{ List, Stream }
import scala.reflect.ClassTag

/** This trait implements a forwarder for traversable objects. It forwards
 *  all calls to a different traversable, except for:
 *
 *  - `toString`, `hashCode`, `equals`, `stringPrefix`
 *  - `newBuilder`, `view`
 *
 *  All calls creating a new traversable of the same kind.
 *
 *  @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 TraversableForwarder[+A] extends Traversable[A] {
  /** The traversable object to which calls are forwarded. */
  protected def underlying: Traversable[A]

  override def foreach[B](f: A => B): Unit = underlying foreach f
  override def isEmpty: Boolean = underlying.isEmpty
  override def nonEmpty: Boolean = underlying.nonEmpty
  override def size: Int = underlying.size
  override def hasDefiniteSize = underlying.hasDefiniteSize
  override def forall(p: A => Boolean): Boolean = underlying forall p
  override def exists(p: A => Boolean): Boolean = underlying exists p
  override def count(p: A => Boolean): Int = underlying count p
  override def find(p: A => Boolean): Option[A] = underlying find p
  override def foldLeft[B](z: B)(op: (B, A) => B): B = underlying.foldLeft(z)(op)
  override def /: [B](z: B)(op: (B, A) => B): B = underlying./:(z)(op)
  override def foldRight[B](z: B)(op: (A, B) => B): B = underlying.foldRight(z)(op)
  override def :\ [B](z: B)(op: (A, B) => B): B = underlying.:\(z)(op)
  override def reduceLeft[B >: A](op: (B, A) => B): B = underlying.reduceLeft(op)
  override def reduceLeftOption[B >: A](op: (B, A) => B): Option[B] = underlying.reduceLeftOption(op)
  override def reduceRight[B >: A](op: (A, B) => B): B = underlying.reduceRight(op)
  override def reduceRightOption[B >: A](op: (A, B) => B): Option[B] = underlying.reduceRightOption(op)
  override def sum[B >: A](implicit num: Numeric[B]): B = underlying sum num
  override def product[B >: A](implicit num: Numeric[B]): B = underlying product num
  override def min[B >: A](implicit cmp: Ordering[B]): A = underlying min cmp
  override def max[B >: A](implicit cmp: Ordering[B]): A = underlying max cmp
  override def head: A = underlying.head
  override def headOption: Option[A] = underlying.headOption
  override def last: A = underlying.last
  override def lastOption: Option[A] = underlying.lastOption
  override def copyToBuffer[B >: A](dest: Buffer[B]) = underlying.copyToBuffer(dest)
  override def copyToArray[B >: A](xs: Array[B], start: Int, len: Int) = underlying.copyToArray(xs, start, len)
  override def copyToArray[B >: A](xs: Array[B], start: Int) = underlying.copyToArray(xs, start)
  override def copyToArray[B >: A](xs: Array[B]) = underlying.copyToArray(xs)
  override def toArray[B >: A: ClassTag]: Array[B] = underlying.toArray
  override def toList: List[A] = underlying.toList
  override def toIterable: Iterable[A] = underlying.toIterable
  override def toSeq: Seq[A] = underlying.toSeq
  override def toIndexedSeq = underlying.toIndexedSeq
  override def toBuffer[B >: A] = underlying.toBuffer
  override def toStream: Stream[A] = underlying.toStream
  override def toSet[B >: A]: immutable.Set[B] = underlying.toSet
  override def toMap[T, U](implicit ev: A <:< (T, U)): immutable.Map[T, U] = underlying.toMap(ev)
  override def mkString(start: String, sep: String, end: String): String = underlying.mkString(start, sep, end)
  override def mkString(sep: String): String = underlying.mkString(sep)
  override def mkString: String = underlying.mkString
  override def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder = underlying.addString(b, start, sep, end)
  override def addString(b: StringBuilder, sep: String): StringBuilder = underlying.addString(b, sep)
  override def addString(b: StringBuilder): StringBuilder = underlying.addString(b)
}