PFParticle.h

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//
// \brief Definition of PFParticle object for LArSoft
//
// \author usher@slac.stanford.edu
//

#ifndef Recob_PFParticle_H
#define Recob_PFParticle_H

#include <iosfwd>
#include <limits>
#include <vector>

namespace recob {

  class PFParticle {

  public:
    PFParticle(); 

  private:
    int fPdgCode;   
    size_t fSelf;   
    size_t fParent; 
    std::vector<size_t> fDaughters; 

  public:
    static constexpr size_t kPFParticlePrimary = std::numeric_limits<size_t>::max();

    PFParticle(int pdgCode, size_t self, size_t parent, const std::vector<size_t>& daughters);

    PFParticle(int pdgCode, size_t self, size_t parent, std::vector<size_t>&& daughters);

    ~PFParticle() = default;

    PFParticle(const PFParticle& other) = default;
    PFParticle(PFParticle&& other) = default;

    PFParticle& operator=(const PFParticle& other) = default;
    PFParticle& operator=(PFParticle&& other) = default;


    int PdgCode() const { return fPdgCode; }

    bool IsPrimary() const { return fParent == PFParticle::kPFParticlePrimary; }

    int NumDaughters() const { return fDaughters.size(); }

    size_t Self() const { return fSelf; }

    size_t Parent() const { return fParent; }

    size_t Daughter(size_t idx) const { return Daughters().at(idx); }

    const std::vector<size_t>& Daughters() const { return fDaughters; }


    friend std::ostream& operator<<(std::ostream& o, const PFParticle& c);
    friend bool operator<(const PFParticle& a, const PFParticle& b);

  }; // class PFParticle
} // namespace recob

#endif //Recob_PFParticle_H