Provenance/interface/FileID.h

0001 #ifndef DataFormats_Provenance_FileID_h
0002 #define DataFormats_Provenance_FileID_h
0003
0004 /*----------------------------------------------------------------------
0005
0006 Holds a unique file identifier in string form.
0007
0008 ----------------------------------------------------------------------*/
0009
0010 #include <string>
0011
0012 namespace edm {
0013
0014   class FileID {
0015   public:
0016     FileID() : fid_() {}
0017     explicit FileID(std::string const& id) : fid_(id) {}
0018     bool isValid() const { return !fid().empty(); }
0019     std::string const& fid() const { return fid_; }
0020
0021   private:
0022     std::string fid_;
0023   };
0024
0025   inline bool operator==(FileID const& lh, FileID const& rh) { return lh.fid() == rh.fid(); }
0026
0027   inline bool operator!=(FileID const& lh, FileID const& rh) { return !(lh == rh); }
0028
0029   std::ostream& operator<<(std::ostream& os, FileID const& id);
0030 }  // namespace edm
0031 #endif