FastTrackingHelper.h

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#ifndef FASTSIMULATION_TRACKING_FASTTRACKINGHELPER_H
#define FASTSIMULATION_TRACKING_FASTTRACKINGHELPER_H

#include "DataFormats/TrackerRecHit2D/interface/FastTrackerRecHitCollection.h"
#include "DataFormats/TrackerRecHit2D/interface/FastTrackerRecHit.h"

namespace fastTrackingHelper {
    
    template<class T> inline void setRecHitCombinationIndex(edm::OwnVector<T> & recHits,int32_t icomb){
    for(auto & recHit : recHits){
        if(!trackerHitRTTI::isFast(recHit)){
        throw cms::Exception("fastTrackingHelpers::setRecHitCombinationIndex: one of hits in OwnVector is non-fastsim");
        }
        static_cast<FastTrackerRecHit &>(recHit).setRecHitCombinationIndex(icomb);
    }
    }

    // get recHitCombination for TrackCandidate and TrajectorySeed
    template<class T> int32_t getRecHitCombinationIndex(const T & object){
    // seed must have at least one hit
    if(object.recHits().first == object.recHits().second){
        throw cms::Exception("fastTrackingHelpers::getRecHitCombinationIndex") << "  given object has 0 hits" << std::endl;
    }

    const TrackingRecHit & recHit = *object.recHits().first;
    if(!trackerHitRTTI::isFast(recHit)){
        throw cms::Exception("fastTrackingHelpers::setRecHitCombinationIndex") << "  one of hits in OwnVector is non-fastsim" << std::endl;
    }
    // cast and return combination index
    return static_cast<const FastTrackerRecHit &>(recHit).recHitCombinationIndex();
    // return combination index of first hit
    }
    
}

#endif