--- trunk/OOPSE-1.0/utils/sysbuilder/Lattice.hpp	2004/07/28 18:42:59	1427
+++ trunk/OOPSE-1.0/utils/sysbuilder/Lattice.hpp	2004/07/28 20:29:49	1429
@@ -1,6 +1,9 @@
 #ifndef _LATTICE_H_
 #define _LATTICE_H_
 #include "BaseLattice.hpp"
+#include <string>
+#include <vector>
+using namespace std;
 
 const string FCCLatticeType = "FCC";
 const string BCCLatticeType = "BCC";
@@ -13,10 +16,10 @@ class CubicLattice : public BaseLattice{
     CubicLattice();
   public:
     //get lattice constant of unit cell
-    vector<double> getLatticeConstant();
+    virtual vector<double> getLatticeConstant();
 
     //set lattice constant of unit cell
-    void setLatticeConstant(const vector<double>& lc);
+    virtual void setLatticeConstant(const vector<double>& lc);
   protected:
     double latticeParam;
 };