ElementID.h

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#ifndef DataFormats_Provenance_ElementID_h
#define DataFormats_Provenance_ElementID_h

#include "DataFormats/Provenance/interface/ProductID.h"

#include <iosfwd>

namespace edm {
  class ElementID {
  public:
    using key_type = unsigned int;

    ElementID() = default;
    explicit ElementID(edm::ProductID id, key_type ind): index_(ind), id_(id) {}

    bool isValid() const { return id_.isValid(); }
    ProductID id() const { return id_; }
    key_type index() const { return index_; }
    key_type key() const { return index_; }
    void reset() { index_ = 0; id_.reset(); }

    void swap(ElementID& other);

  private:
    key_type index_ = 0;
    ProductID id_;
  };

  inline
  void swap(ElementID& a, ElementID& b) {
    a.swap(b);
  }

  inline
  bool operator==(ElementID const& lh, ElementID const& rh) {
    return lh.index() == rh.index() && lh.id() == rh.id();
  }

  inline
  bool operator!=(ElementID const& lh, ElementID const& rh) {
    return !(lh == rh);
  }

  bool operator<(ElementID const& lh, ElementID const& rh);

  std::ostream& operator<<(std::ostream& os, ElementID const& id);
}

#endif