VertexCompositeCandidate.h

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#ifndef DataFormats_Candidate_VertexCompositeCandidate_H
#define DataFormats_Candidate_VertexCompositeCandidate_H

#include "DataFormats/Candidate/interface/VertexCompositeCandidateFwd.h"
#include "DataFormats/Candidate/interface/CompositeCandidate.h"

namespace reco {
  class VertexCompositeCandidate : public CompositeCandidate {
  public:
    VertexCompositeCandidate() : CompositeCandidate() { }
    VertexCompositeCandidate(Charge q, const LorentzVector & p4, const Point & vtx,
                 int pdgId = 0, int status = 0, bool integerCharge = true) :
      CompositeCandidate(q, p4, vtx, pdgId, status, integerCharge),
      chi2_(0), ndof_(0) { }
    VertexCompositeCandidate(Charge q, const LorentzVector & p4, const Point & vtx,
                 const CovarianceMatrix & err, double chi2, double ndof,
                 int pdgId = 0, int status = 0, bool integerCharge = true);
    explicit VertexCompositeCandidate(const Candidate & p) :
      CompositeCandidate(p), chi2_(0), ndof_(0) { }
    explicit VertexCompositeCandidate(const CompositeCandidate & p) :
      CompositeCandidate(p), chi2_(0), ndof_(0) { }
    ~VertexCompositeCandidate() override;
    VertexCompositeCandidate * clone() const override;
    double vertexChi2() const override { return chi2_; }
    double vertexNdof() const override { return ndof_; }
    double vertexNormalizedChi2() const override { return chi2_ / ndof_; }
    double vertexCovariance(int i, int j) const override { 
      return covariance_[idx(i, j)]; 
    }
    using reco::LeafCandidate::vertexCovariance; // avoid hiding the
    void fillVertexCovariance(CovarianceMatrix & v) const override;
    void setChi2AndNdof(double chi2, double ndof) {
      chi2_ = chi2; ndof_ = ndof;
    }
    void setCovariance(const CovarianceMatrix &m);
  private:
    Double32_t chi2_;
    Double32_t ndof_;
    Double32_t covariance_[size];
    index idx(index i, index j) const {
      int a = (i <= j ? i : j), b = (i <= j ? j : i);
      return b * (b + 1)/2 + a;
    }
  };

}

#endif