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Diffstat (limited to 'src/library/scala/collection/generic/TraversableForwarder.scala')
-rwxr-xr-x | src/library/scala/collection/generic/TraversableForwarder.scala | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/src/library/scala/collection/generic/TraversableForwarder.scala b/src/library/scala/collection/generic/TraversableForwarder.scala new file mode 100755 index 0000000000..219021f8e6 --- /dev/null +++ b/src/library/scala/collection/generic/TraversableForwarder.scala @@ -0,0 +1,62 @@ +/* __ *\ +** ________ ___ / / ___ Scala API ** +** / __/ __// _ | / / / _ | (c) 2003-2009, LAMP/EPFL ** +** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ ** +** /____/\___/_/ |_/____/_/ | | ** +** |/ ** +\* */ + +// $Id: IterableProxy.scala 15458 2008-06-28 20:23:22Z stepancheg $ + + +package scala.collection.generic + +import mutable.Buffer +// import immutable.{List, Nil, ::, Stream} + +/** This trait implements a forwarder for traversable objects. It forwards + * all calls to a different iterable object, except for + * + * - toString, hashCode, equals, stringPrefix + * - newBuilder, view + * - all calls creating a new iterable object of the same kind + * + * The above methods are forwarded by subclass TraversableProxy + * + * @author Martin Odersky + * @version 2.8 + */ +trait TraversableForwarder[+A] extends Traversable[A] { + + /** The iterable object to which calls are forwarded */ + protected def underlying: Traversable[A] + + // Iterable delegates + // Iterable methods could be printed by cat IterableTemplate.scala | sed -n '/trait Iterable/,$ p' | egrep '^ (override )?def' + + override def isEmpty = underlying.isEmpty + override def hasDefiniteSize = underlying.hasDefiniteSize + override def foreach(f: A => Unit) = underlying.foreach(f) + 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 foldRight[B](z: B)(op: (A, B) => B): B = underlying.foldRight(z)(op) + override def reduceLeft[B >: A](op: (B, A) => B): B = underlying.reduceLeft(op) + override def reduceRight[B >: A](op: (A, B) => B): B = underlying.reduceRight(op) + override def reduceLeftOpt[B >: A](op: (B, A) => B): Option[B] = underlying.reduceLeftOpt(op) + override def reduceRightOpt[B >: A](op: (A, B) => B): Option[B] = underlying.reduceRightOpt(op) + 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 toArray[B >: A]: Array[B] = underlying.toArray + override def toList: List[A] = underlying.toList + override def toSequence: Sequence[A] = underlying.toSequence + override def toStream: Stream[A] = underlying.toStream + override def mkString(start: String, sep: String, end: String): String = underlying.mkString(start, sep, end) + override def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder = underlying.addString(b, start, sep, end) + + override def head: A = underlying.head + override def last: A = underlying.last + override def lastOption: Option[A] = underlying.lastOption +} |