SeedingHitSet.h

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#ifndef TkSeedingLayers_SeedingHitSet_H
#define TkSeedingLayers_SeedingHitSet_H

#include "DataFormats/TrackerRecHit2D/interface/BaseTrackerRecHit.h"

class SeedingHitSet {
public:
  using RecHit = BaseTrackerRecHit;
  using RecHitPointer = BaseTrackerRecHit *;
  using ConstRecHitPointer = BaseTrackerRecHit const *;

  static ConstRecHitPointer nullPtr() { return nullptr; }

  SeedingHitSet() { theRecHits[0] = theRecHits[1] = theRecHits[2] = theRecHits[3] = nullptr; }

  SeedingHitSet(ConstRecHitPointer one, ConstRecHitPointer two)
  // : theRecHits{{one,two,ConstRecHitPointer()}}
  {
    theRecHits[0] = one;
    theRecHits[1] = two;
    theRecHits[2] = theRecHits[3] = nullptr;
  }
  SeedingHitSet(ConstRecHitPointer one, ConstRecHitPointer two, ConstRecHitPointer three)
  // : theRecHits{{one,two,three}},
  {
    theRecHits[0] = one;
    theRecHits[1] = two;
    theRecHits[2] = three;
    theRecHits[3] = nullptr;
  }

  SeedingHitSet(ConstRecHitPointer one, ConstRecHitPointer two, ConstRecHitPointer three, ConstRecHitPointer four) {
    theRecHits[0] = one;
    theRecHits[1] = two;
    theRecHits[2] = three;
    theRecHits[3] = four;
  }

  ConstRecHitPointer const *data() const { return theRecHits; }

  unsigned int size() const { return theRecHits[3] ? 4 : (theRecHits[2] ? 3 : (theRecHits[1] ? 2 : 0)); }

  ConstRecHitPointer get(unsigned int i) const { return theRecHits[i]; }
  ConstRecHitPointer operator[](unsigned int i) const { return theRecHits[i]; }

private:
  ConstRecHitPointer theRecHits[4];
};

#endif