--- trunk/escript/src/DataAbstract.h	2008/10/19 23:16:21	1896
+++ trunk/escript/src/DataAbstract.h	2008/10/20 00:32:30	1897
@@ -479,9 +479,12 @@
   virtual const DataTypes::ValueType&
   getVector() const=0;
 
+  ESCRIPT_DLL_API
+  bool isEmpty() const;	// a fast test to determine if this object is an instance of DataEmpty
+
  protected:
 
-  bool isEmpty() const;	// a fast test to determine if this object is an instance of DataEmpty
+