Adding copyInto and toVector methods to collections.

* Added generic copyInto method for collections.  For any collection with a CanBuildFrom, can convert a generic collection into it using the builder.
* Added specifici toVector method for collections.   This is more efficient than copyInto if the collection is a Vector.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/library/scala/collection/Iterator.scala b/src/library/scala/collection/Iterator.scala
index b2bbc8d888..62449c7712 100644
--- a/src/library/scala/collection/Iterator.scala
+++ b/src/library/scala/collection/Iterator.scala
@@ -11,6 +11,8 @@ package scala.collection
 import mutable.ArrayBuffer
 import annotation.migration
 import immutable.Stream
+import scala.collection.generic.CanBuildFrom
+import scala.annotation.unchecked.{ uncheckedVariance => uV }
 
 /** The `Iterator` object provides various functions for creating specialized iterators.
  *
@@ -1139,6 +1141,14 @@ trait Iterator[+A] extends TraversableOnce[A] {
     if (self.hasNext) Stream.cons(self.next, self.toStream)
     else Stream.empty[A]
 
+  def toVector: Vector[A] = copyInto[Vector]
+  def copyInto[Col[_]](implicit cbf: CanBuildFrom[Nothing, A, Col[A @uV]]): Col[A @uV] = {
+    val b = cbf()
+    while(hasNext) b += next
+    b.result
+  }
+  
+
   /** Converts this iterator to a string.
    *
    *  @return `"empty iterator"` or `"non-empty iterator"`, depending on