/data/refman/pasoursint/CMSSW_5_2_9/src/RecoTracker/TrackProducer/interface/TrackingRecHitLess.h

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#ifndef TrackCandidate_TrackingRecHitLess_H
#define TrackCandidate_TrackingRecHitLess_H

#include "DataFormats/TrajectorySeed/interface/PropagationDirection.h"
#include "Geometry/CommonDetUnit/interface/GeomDet.h"
#include <functional>
#include "Geometry/TrackerGeometryBuilder/interface/GeomDetLess.h"
#include "Geometry/CommonDetUnit/interface/TrackingGeometry.h"
#include "DataFormats/TrackingRecHit/interface/TrackingRecHit.h"

#include "FWCore/MessageLogger/interface/MessageLogger.h"

class TrackingRecHitLess {
public:

  TrackingRecHitLess( const TrackingGeometry * geometry_, PropagationDirection dir = alongMomentum) :
    g_(geometry_){
    less_ = new GeomDetLess(dir);
  }


  bool operator()( const TrackingRecHit& a, const TrackingRecHit& b) const {
    
    return  less_->operator()(
                             g_->idToDet(a.geographicalId()), g_->idToDet(b.geographicalId()));
  }

 private:
  const TrackingGeometry * g_;
  GeomDetLess * less_;
};

#endif