/data/refman/pasoursint/CMSSW_5_3_9_patch3/src/TrackingTools/GsfTools/interface/DistanceBetweenComponents.h

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#ifndef DistanceBetweenComponents_H
#define DistanceBetweenComponents_H

#include "TrackingTools/GsfTools/interface/SingleGaussianState.h"

template <unsigned int N>
class DistanceBetweenComponents {
public:
  typedef SingleGaussianState<N> SingleState;
 public:

  virtual double operator() (const SingleState&, 
                             const SingleState&) const = 0;

  virtual DistanceBetweenComponents<N>* clone() const = 0;

  virtual ~DistanceBetweenComponents() {}
  
};  

#endif // DistanceBetweenComponents_H