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 <vector>
#include <ostream>
#include <limits>

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