1 files changed, 32 insertions, 0 deletions
diff --git a/src/library/scala/collection/generic/ClassTagTraversableFactory.scala b/src/library/scala/collection/generic/ClassTagTraversableFactory.scala
new file mode 100644
index 0000000000..95835d3e90
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+++ b/src/library/scala/collection/generic/ClassTagTraversableFactory.scala
@@ -0,0 +1,32 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2010-2011, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+package scala.collection
+package generic
+
+import language.higherKinds
+import reflect.ClassTag
+
+/** A template for companion objects of `ClassTagTraversable` and
+ *  subclasses thereof.
+ *
+ *  @define coll collection
+ *  @define Coll `Traversable`
+ *  @define genericCanBuildFromInfo
+ *    The standard `CanBuildFrom` instance for $Coll objects.
+ *    @author Aleksandar Prokopec
+ *    @since 2.8
+ */
+abstract class ClassTagTraversableFactory[CC[X] <: Traversable[X] with GenericClassTagTraversableTemplate[X, CC]]
+              extends GenericClassTagCompanion[CC] {
+
+  class GenericCanBuildFrom[A](implicit tag: ClassTag[A]) extends CanBuildFrom[CC[_], A, CC[A]] {
+    def apply(from: CC[_]) = from.genericClassTagBuilder[A]
+    def apply = newBuilder[A]
+  }
+}