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);
}  // namespace edm
 
#endif