/data/refman/pasoursint/CMSSW_4_4_5_patch3/src/TrackingTools/TrackFitters/interface/RecHitLessByDet.h

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#ifndef CD_RecHitLessByDet_H_
#define CD_RecHitLessByDet_H_

#include "DataFormats/TrajectorySeed/interface/PropagationDirection.h"
#include "TrackingTools/TransientTrackingRecHit/interface/TransientTrackingRecHit.h"

class RecHitLessByDet {

  typedef TransientTrackingRecHit::ConstRecHitPointer RecHitPointer;
public:

  RecHitLessByDet(const PropagationDirection& dir) :
    theDirection(dir) {}

  ~RecHitLessByDet() {}

  bool operator()(const RecHitPointer& aHit, const RecHitPointer& bHit) const{

    return (theDirection == alongMomentum ? 
            (aHit->surface()->toGlobal(aHit->localPosition()).mag() < 
             bHit->surface()->toGlobal(bHit->localPosition()).mag() ) :
            (aHit->surface()->toGlobal(aHit->localPosition()).mag() >
             bHit->surface()->toGlobal(bHit->localPosition()).mag()) );
  }

private:
  
  PropagationDirection theDirection;

};
#endif //CD_RecHitLessByDet_H_