4 out of 5 spelling bee champs say: Traversable

1 files changed, 29 insertions, 0 deletions

diff --git a/src/library/scala/collection/generic/TraversableView.scala b/src/library/scala/collection/generic/TraversableView.scala
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+++ b/src/library/scala/collection/generic/TraversableView.scala
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+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+package scala.collection.generic
+
+import Math.MAX_INT
+import TraversableView.NoBuilder
+
+/** A base class for views of Traversable.
+ *  Every subclass has to implenment the foreach method
+ *  @author Martin Odersky
+ *  @version 2.8
+ */
+trait TraversableView[+A, +Coll <: Traversable[_]] extends TraversableViewTemplate[A, Coll, TraversableView[A, Coll]]
+
+object TraversableView {
+  class NoBuilder[A] extends Builder[A, Nothing, TraversableView[_, _]] {
+    def +=(elem: A) {}
+    def elements: Iterator[A] = Iterator.empty
+    def result() = throw new UnsupportedOperationException("TraversableView.Builder.result")
+    def clear() {}
+  }
+  type Coll = TraversableView[_, _]
+  implicit def builderFactory[A]: BuilderFactory[A, TraversableView[A, Traversable[_]], Coll] = new BuilderFactory[A, TraversableView[A, Traversable[_]], Coll] { def apply(from: Coll) = new NoBuilder }
+}