SpacePoint.h

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//
// Definition of SpacePoint class for LArSoft
//
// SpacePoints are 3D objects that contain pointers to Hits from multiple
// wireplanes that have been identified as matching.
//
// msoderbe@syr.edu
//

#ifndef SPACEPOINT_H
#define SPACEPOINT_H

#include <iosfwd>

#include "larcoreobj/SimpleTypesAndConstants/PhysicalConstants.h"

namespace recob {

  class SpacePoint {

  public:
    using ID_t = int; 
    
    static constexpr ID_t InvalidID = util::kBogusI;
    

    SpacePoint();  

  private:
    ID_t                       fID;        
    double                     fXYZ[3];    
    double                     fErrXYZ[6]; 
    double                     fChisq;     

  public:
    SpacePoint(double const*xyz,
               double const*err,
               double  chisq,
               int     id=InvalidID);

    ID_t                       ID()      const;
    const double*              XYZ()     const;
    const double*              ErrXYZ()  const;
    double                     Chisq()   const;

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


  };

  inline bool operator< (SpacePoint const& s, SpacePoint::ID_t id) { return s.ID() < id; }
  inline bool operator< (SpacePoint::ID_t id, SpacePoint const& s) { return id < s.ID(); }

}


inline recob::SpacePoint::ID_t recob::SpacePoint::ID() const { return fID; }
inline const double* recob::SpacePoint::XYZ()     const { return fXYZ;    }
inline const double* recob::SpacePoint::ErrXYZ()  const { return fErrXYZ; }
inline double        recob::SpacePoint::Chisq()   const { return fChisq;  }

#endif //SPACEPOINT_H