/data/refman/pasoursint/CMSSW_4_1_8_patch9/src/TrackingTools/GsfTools/interface/KullbackLeiblerDistance.h

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#ifndef KullbackLeiblerDistance_H
#define KullbackLeiblerDistance_H

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

template <unsigned int N>
class KullbackLeiblerDistance : public DistanceBetweenComponents<N> {

private:
  typedef typename SingleGaussianState<N>::Vector Vector;
  typedef typename SingleGaussianState<N>::Matrix Matrix;
  
public:
  
  virtual double operator() (const SingleGaussianState<N>&, 
                             const SingleGaussianState<N>&) const;

  virtual KullbackLeiblerDistance<N>* clone() const
  {  
    return new KullbackLeiblerDistance<N>(*this);
  }

// private:
//   double trace (const Matrix& matrix) const;
};  

#include "TrackingTools/GsfTools/interface/KullbackLeiblerDistance.icc"

#endif // KullbackLeiblerDistance_H