#ifndef DWBASISHH
#define DWBASISHH

#include <ostream.h>

class DWBasis {
  friend ostream& operator<<(ostream&, const DWBasis&);
public:
  virtual ~DWBasis() {};
  virtual void Unveil(ostream & o) const = 0;
};

ostream & operator<< (ostream & o,  const DWBasis & u) ;

#endif