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diff --git a/libcds/src/static_bitsequence/static_bitsequence.h b/libcds/src/static_bitsequence/static_bitsequence.h
index 4b6e83a..d8e3f18 100644
--- a/libcds/src/static_bitsequence/static_bitsequence.h
+++ b/libcds/src/static_bitsequence/static_bitsequence.h
@@ -31,7 +31,7 @@
 #include <iostream>
 
 
-using namespace std;
+//using namespace std;
 
 /** Base class for static bitsequences, contains many abstract functions, so this can't
  *  be instantiated. It includes base implementations for rank0, select0 and select1 based
@@ -58,6 +58,9 @@ public:
 	 * @return (uint)-1 if i=0, len if i>num_ones or the position */
   virtual uint select1(uint i);
 
+	virtual uint select_next1(uint i);
+	virtual uint select_next0(uint i);
+
 	/** Returns the i-th bit */
   virtual bool access(uint i);