Edge.h

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#ifndef LARDATAOBJ_RECOBASE_EDGE_H
#define LARDATAOBJ_RECOBASE_EDGE_H

// LArSoft libraries
#include "lardataobj/RecoBase/SpacePoint.h"

// C/C++ libraries
#include <iosfwd> // std::ostream
#include <limits> // std::numeric_limits<>

namespace recob {

  class Edge {
  public:
    using ID_t = unsigned int;

    using SpacePointID_t = recob::SpacePoint::ID_t;

    static constexpr ID_t InvalidID = std::numeric_limits<ID_t>::max();

    Edge() = default;

    Edge(const double length,
         SpacePointID_t firstPointID,
         SpacePointID_t secondPointID,
         ID_t id = InvalidID);

    Edge(SpacePoint const& firstPoint, SpacePoint const& secondPoint, ID_t id = InvalidID);


    double Length() const { return fLength; }

    SpacePointID_t FirstPointID() const { return fFirstPointID; }

    SpacePointID_t SecondPointID() const { return fSecondPointID; }

    ID_t ID() const { return fID; }


  private:
    double fLength = 0.0;
    SpacePointID_t fFirstPointID = recob::SpacePoint::InvalidID;
    SpacePointID_t fSecondPointID = recob::SpacePoint::InvalidID;
    ID_t fID = InvalidID;

  }; // class Edge

  std::ostream& operator<<(std::ostream& o, const Edge& a);

  inline bool operator<(const Edge& a, const Edge& b)
  {
    return a.ID() < b.ID();
  }
  inline bool operator<(const Edge& e, Edge::ID_t id)
  {
    return e.ID() < id;
  }
  inline bool operator<(Edge::ID_t id, const Edge& e)
  {
    return id < e.ID();
  }

} // namespace recob

#endif // LARDATAOBJ_RECOBASE_EDGE_H