Provenance/interface/BranchID.h

0001 #ifndef DataFormats_Provenance_BranchID_h
0002 #define DataFormats_Provenance_BranchID_h
0003
0004 /*----------------------------------------------------------------------
0005
0006 BranchID: A unique identifier for each branch.
0007
0008 ----------------------------------------------------------------------*/
0009
0010 #include <iosfwd>
0011 #include <string>
0012
0013 namespace edm {
0014   class BranchID {
0015   public:
0016     typedef unsigned int value_type;
0017     BranchID() : id_(0) {}
0018     explicit BranchID(std::string const& branchName) : id_(toID(branchName)) {}
0019     explicit BranchID(value_type theID) : id_(theID) {}
0020     void setID(std::string const& branchName) { id_ = toID(branchName); }
0021     unsigned int id() const { return id_; }
0022     bool isValid() const { return id_ != 0; }
0023
0024     bool operator<(BranchID const& rh) const { return id_ < rh.id_; }
0025     bool operator>(BranchID const& rh) const { return id_ > rh.id_; }
0026     bool operator==(BranchID const& rh) const { return id_ == rh.id_; }
0027     bool operator!=(BranchID const& rh) const { return id_ != rh.id_; }
0028
0029   private:
0030     static value_type toID(std::string const& branchName);
0031     value_type id_;
0032   };
0033
0034   std::ostream& operator<<(std::ostream& os, BranchID const& id);
0035 }  // namespace edm
0036 #endif