1 files changed, 31 insertions, 0 deletions
diff --git a/src/library/scalax/collection/generic/Builder.scala b/src/library/scalax/collection/generic/Builder.scala
new file mode 100755
index 0000000000..155ca553fa
--- /dev/null
+++ b/src/library/scalax/collection/generic/Builder.scala
@@ -0,0 +1,31 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: ListBuffer.scala 14378 2008-03-13 11:39:05Z dragos $
+
+package scalax.collection.generic
+
+import generic._
+
+trait Builder[+CC[B], A] extends Growable[A] {
+  def +=(x: A)
+  def elements: Iterator[A]
+  def result: CC[A]
+
+  def mapResult[DD[B]](f: CC[A] => DD[A]) =
+    new Builder[DD, A] with Proxy {
+      val self = Builder.this
+      def +=(x: A) = self += x
+      def elements: Iterator[A] = self.elements
+      def clear() = self.clear()
+      override def ++=(xs: Iterator[A]) = self ++= xs
+      override def ++=(xs: collection.Iterable[A]) = self ++= xs
+      def result: DD[A] = f(Builder.this.result)
+    }
+}
+