fixed 2 bugs in classs BitSet and added scalado...

fixed 2 bugs in classs BitSet and added scaladoc comment methods
isInstanceOf and synchronized

1 files changed, 6 insertions, 4 deletions

diff --git a/src/library/scala/collection/immutable/BitSet.scala b/src/library/scala/collection/immutable/BitSet.scala
index 6e33e43899..9dad0ba39e 100644
--- a/src/library/scala/collection/immutable/BitSet.scala
+++ b/src/library/scala/collection/immutable/BitSet.scala
@@ -39,13 +39,15 @@ class BitSet(val size: Int, val capacity: Int, ba: Array[Int], copy: Boolean)
 {
   import compat.Platform.arraycopy
 
-  protected val arr: Array[Int] =
+  protected val arr: Array[Int] = {
+    val ba1 = if (ba != null && ba.length > 0) ba else Array(0)
     if (copy) {
-      val arr = new Array[Int](ba.length)
-      arraycopy(ba, 0, arr, 0, ba.length)
+      val arr = new Array[Int](ba1.length)
+      arraycopy(ba1, 0, arr, 0, ba1.length)
       arr
     }
     else
-      ba
+      ba1
+  }
 
 }