Distance3DSquared.h

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
 
#pragma once
 
#include <tracking/trackFindingVXD/filterMap/filterFramework/SelectionVariable.h>
#include <math.h>
 
//use this class name only
#define DISTANCE3DSQUARED_NAME Distance3DSquared
 
namespace Belle2 {
  template <typename PointType>
  class DISTANCE3DSQUARED_NAME : public SelectionVariable< PointType, 2, double > {
  public:
    PUT_NAME_FUNCTION(DISTANCE3DSQUARED_NAME);
 
 
 
    static double value(const PointType& outerHit, const PointType& innerHit)
    {
 
      return
        std::pow(outerHit.X() - innerHit.X(), 2) +
        std::pow(outerHit.Y() - innerHit.Y(), 2) +
        std::pow(outerHit.Z() - innerHit.Z(), 2) ;
    }
  };
 
}