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#ifndef DataFormats_Provenance_ElementID_h
#define DataFormats_Provenance_ElementID_h
#include "DataFormats/Provenance/interface/ProductID.h"
#include <iosfwd>
namespace edm {
/**
* ElementID is a unique identifier for an element within a
* container. It extends the ProductID concept by adding an index to
* an object within a container.
*
* It provides both index() and key() methods so that it can be used
* in place of Ref/Ptr in the interfaces of e.g. ValueMap or Association.
*/
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
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