DetId.h

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#ifndef DATAFORMATS_DETID_H
#define DATAFORMATS_DETID_H


//FIXME shall be removed and implemented where the operator is defined
#include <ostream>

#include <cstdint>
class DetId {
public:
  static const int kDetMask            = 0xF;
  static const int kSubdetMask         = 0x7;
  static const int kDetOffset          = 28;
  static const int kSubdetOffset       = 25;


  enum Detector {Tracker=1, Muon=2, Ecal=3, Hcal=4, Calo=5, Forward=6,
         VeryForward=7, HGCalEE=8, HGCalHSi=9, HGCalHSc=10,
         HGCalTrigger=11};
  constexpr DetId()  : id_(0) { }
  constexpr DetId(uint32_t id) : id_(id) { }
  constexpr DetId(Detector det, int subdet) 
    : id_(((det&kDetMask)<<kDetOffset)|((subdet&kSubdetMask)<<kSubdetOffset))
  {}

  constexpr Detector det() const { return Detector((id_>>kDetOffset)&kDetMask); }
  constexpr int subdetId() const { return ((id_>>kSubdetOffset)&kSubdetMask); }

  constexpr uint32_t operator()() const { return id_; }
  constexpr operator uint32_t() const { return id_; }

  constexpr uint32_t rawId() const { return id_; }
  constexpr bool null() const { return id_==0; }
  
  constexpr bool operator==(DetId id) const { return id_==id.id_; }
  constexpr bool operator!=(DetId id) const { return id_!=id.id_; }
  constexpr bool operator<(DetId id) const { return id_<id.id_; }

protected:
  uint32_t id_;
};

constexpr inline bool operator==(uint32_t i, DetId id)  { return i==id(); }
constexpr inline bool operator==(DetId id, uint32_t i)  { return i==id(); }
constexpr inline bool operator!=(uint32_t i, DetId id)  { return i!=id(); }
constexpr inline bool operator!=(DetId id, uint32_t i) { return i!=id(); }
constexpr inline bool operator<(uint32_t i, DetId id) { return i<id(); }
constexpr inline bool operator<(DetId id, uint32_t i) { return id()<i; }


//std::ostream& operator<<(std::ostream& s, const DetId& id);

namespace std {
  template<> struct hash<DetId> {
    typedef DetId argument_type;
    typedef std::size_t result_type;
    result_type operator()(argument_type const& id) const noexcept {
      return std::hash<uint32_t>()(id.rawId());            
    }
  };
}

#endif