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 // -*- C++ -*-
 #ifndef RIVET_Run_HH
 #define RIVET_Run_HH
 
 #include "Rivet/Tools/RivetSTL.hh"
 #include "Rivet/Tools/RivetHepMC.hh"
 #include "Rivet/Tools/Logging.hh"
 
 namespace Rivet {
 
 
   // Forward declaration
   class AnalysisHandler;
 
 
   /// @brief Interface to handle a run of events read from a HepMC stream or file.
   class Run {
   public:
 
     /// Standard constructor.
     Run(AnalysisHandler& ah);
 
     /// Destructor
     ~Run();
 
 
     /// @name Set run properties
     /// @{
 
     /// Get the cross-section for this run.
     Run& setCrossSection(double xs);
 
     /// Declare whether to list available analyses
     Run& setListAnalyses(bool dolist);
 
     /// @}
 
 
     /// @name File processing stages
     /// @{
 
     /// Set up HepMC file readers (using the appropriate file weight for the first file)
     bool init(const std::string& evtfile, double weight=1.0);
 
     /// Open a HepMC GenEvent file (using the appropriate file weight for the first file)
     bool openFile(const std::string& evtfile, double weight=1.0);
 
     /// Read the next HepMC event
     bool readEvent();
 
     /// Read the next HepMC event only to skip it
     //bool skipEvent();
 
     /// Return the number of (collapsed) events read in from HepMC,
     /// including current partial event in case of sub-events
     size_t numEvents() const { return _evtcount; }
 
     /// Handle next event
     bool processEvent();
 
     /// Close up HepMC I/O
     bool finalize();
 
     /// @}
 
 
   private:
 
     /// Get a Log object
     Log& getLog() const;
 
     /// AnalysisHandler object
     AnalysisHandler& _ah;
 
     /// @name Run variables obtained from events or command line
     /// @{
 
     /// @brief An extra event weight scaling per event file.
     /// Useful for e.g. AlpGen n-parton event file combination.
     double _fileweight = 1.0;
 
     /// Cross-section from command line.
     double _xs = NAN;
 
     /// Number of (collapsed) events read from file so far
     size_t _evtcount = 0;
 
     /// Current event number to keep track of sub-events
     int _evtnumber = -1;
 
     /// @}
 
 
     /// Flag to show list of analyses
     bool _listAnalyses = false;
 
 
     /// @name HepMC I/O members
     /// @{
 
     /// Current event
     std::shared_ptr<GenEvent> _evt;
 
     /// Output stream for HepMC writer
     std::shared_ptr<std::istream> _istr;
 
     /// HepMC reader
     std::shared_ptr<HepMC_IO_type> _hepmcReader;
 
     /// @}
 
   };
 
 
 }
 
 #endif

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