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File indexing completed on 2025-09-17 09:13:44

 // -*- C++ -*-
 #ifndef RIVET_RivetHandler_HH
 #define RIVET_RivetHandler_HH
 
 #include "Rivet/Config/RivetCommon.hh"
 #include "Rivet/Particle.hh"
 #include "Rivet/AnalysisLoader.hh"
 #include "Rivet/Tools/RivetYODA.hh"
 #include "Rivet/Tools/Utils.hh"
 #include "Rivet/ProjectionHandler.hh"
 #include "YODA/ReaderYODA.h"
 
 #include <fstream>
 #include <unordered_map>
 
 namespace Rivet {
 
 
   // Forward declaration and smart pointer for Analysis
   class Analysis;
   using AnaHandle = std::shared_ptr<Analysis>;
 
 
   /// @brief The key class for coordination of Analysis objects and the event loop
   ///
   /// A class which handles a number of analysis objects to be applied to
   /// generated events. An {@link Analysis}' AnalysisHandler is also responsible
   /// for handling the final writing-out of histograms.
   class AnalysisHandler {
 
     using TypeHandlePtr = std::shared_ptr<TypeBaseHandle>;
     using TypeRegister = std::unordered_map<string, TypeHandlePtr>;
     using TypeRegisterItr = typename TypeRegister::const_iterator;
 
   public:
 
     using Annotations = std::map<std::string, std::string>;
 
     /// Preferred / default constructor.
     AnalysisHandler();
 
     /// The copy constructor is deleted, so it can never be called.
     AnalysisHandler(const AnalysisHandler&) = delete;
 
     /// The assignment operator is deleted, so it can never be called.
     AnalysisHandler& operator=(const AnalysisHandler&) = delete;
 
     /// The destructor is not virtual, as this class should not be inherited from.
     ~AnalysisHandler();
 
 
     /// @name Run properties
     /// @{
 
     /// Get the number of events seen. Should only really be used by external
     /// steering code or analyses in the finalize phase.
     ///
     /// N.B. This only reports the count for the last collapsed event group
     /// and hence ignores any additional sub-events seen so far.
     size_t numEvents() const {
       const double N = _eventCounter.get()->persistent(defaultWeightIndex())->numEntries();
       return  size_t(N + 0.5 - (N<0)); // round to nearest integer
     }
 
     /// Get the effective number of events seen. Should only really be used by external
     /// steering code or analyses in the finalize phase.
     ///
     /// N.B. This only reports the count for the last collapsed event group
     /// and hence ignores any additional sub-events seen so far.
     double effNumEvents() const {
       if ((bool)_eventCounter) { return _eventCounter->effNumEntries(); }
       return _eventCounter.get()->persistent(defaultWeightIndex())->effNumEntries();
     }
 
     /// @brief Access the sum of the event weights seen
     ///
     /// This is the weighted equivalent of the number of events. It should only
     /// be used by external steering code or analyses in the finalize phase.
     double sumW() const {
       if ((bool)_eventCounter) { return _eventCounter->sumW(); }
       return _eventCounter.get()->persistent(defaultWeightIndex())->sumW();
     }
     /// Access to the sum of squared-weights
     double sumW2() const {
       if ((bool)_eventCounter) { return _eventCounter->sumW2(); }
       return _eventCounter.get()->persistent(defaultWeightIndex())->sumW2();
     }
 
     /// @}
 
 
     /// @name Event weights
     /// @{
 
     /// Names of event weight categories
     const vector<string>& weightNames() const { return _weightNames; }
 
     /// Are any of the weights non-numeric?
     size_t numWeights() const { return _weightNames.size(); }
 
     /// Are any of the weights non-numeric?
     bool haveNamedWeights() const;
 
     /// Set the weight names from a GenEvent
     void setWeightNames(const GenEvent& ge);
 
     /// Set the weight names from a vector<string>
     void setWeightNames(const vector<string>& weightNames);
 
     /// Get the index of the nominal weight-stream
     size_t defaultWeightIndex() const { return _rivetDefaultWeightIdx; }
 
     /// @brief Access the array of sum of the event weights seen
     vector<double> weightSumWs() const;
 
     /// Set the weight cap
     void setWeightCap(const double maxWeight) { _weightCap = maxWeight; }
 
     /// Set the name of the nominal weight stream
     void setNominalWeightName(const std::string& name) { _nominalWeightName = name; }
 
     /// Ignore all weight streams other than the nominal
     void skipMultiWeights(bool skip=false) { _skipMultiWeights = skip; }
 
     /// Specify weight-name patterns to accept
     void matchWeightNames(const std::string& patterns) { _matchWeightNames = patterns; }
 
     /// Specify weight-name patterns to reject
     void unmatchWeightNames(const std::string& patterns) { _unmatchWeightNames = patterns; }
 
     /// Set the relative width of the NLO smearing window.
     void setNLOSmearing(double frac) { _NLOSmearing = frac; }
 
     /// @}
 
 
     /// @name Cross-sections
     /// @{
 
     /// Get the cross-section known to the handler
     Estimate0DPtr crossSection() const { return _xs; }
 
     /// Set all cross-sections for the process being generated specifically (preferred)
     void setCrossSection(const vector<pair<double,double>>& xsecs, bool isUserSupplied = false);
 
     /// Set all cross-sections for the process being generated, based on nominal weight
     void setCrossSection(const pair<double, double>& xsec, bool isUserSupplied=false);
 
     /// Set the cross-section for the process being generated (alternative signature)
     void setCrossSection(double xsec, double xsecerr, bool isUserSupplied=false) {
       setCrossSection({xsec, xsecerr}, isUserSupplied);
     }
 
     /// Update the internal cross-section average when running over multiple files
     ///
     /// @note This method should only be called when switching HepMC file mid-run.
     void updateCrossSection();
 
     /// Toggle to signal a change in HepMC input file
     void notifyEndOfFile() { _isEndOfFile = true; }
 
     /// Get the nominal cross-section
     double nominalCrossSection() const;
 
     /// Get the nominal cross-section
     double nominalCrossSectionError() const;
 
     /// @}
 
 
     /// @name Beams
     /// @{
 
     /// Set the beam particles for this run
     AnalysisHandler& setRunBeams(const ParticlePair& beams);
 
     /// Get the beam particles for this run, usually determined from the first event
     const ParticlePair& runBeams() const { return _beams; }
 
     /// Get beam IDs for this run, usually determined from the first event
     PdgIdPair runBeamIDs() const;
 
     /// Get beam IDs for this run, usually determined from the first event
     pair<double,double> runBeamEnergies() const;
 
     /// Get energy for this run, usually determined from the first event
     double runSqrtS() const;
 
     /// Option to disable analysis-compatibility checks
     void setCheckBeams(bool check=true) { _checkBeams = check; }
 
     /// Option to disable run-consistency checks
     // void setCheckConsistency(bool check=true) { _checkConsistency = check; }
     // Check event consistency with the run, usually determined from the first event
     // bool consistentWithRun(Event& event) {
 
     /// @}
 
 
     /// @name Run-based annotations
     /// @{
 
     // Get all the annotation names
     std::vector<std::string> annotations() const {
       return _beaminfo->annotations();
     }
 
     /// Check if an annotation is defined
     bool hasAnnotation(const std::string& name) const {
       return _beaminfo->hasAnnotation(name);
     }
 
     /// Get an annotation by name (as a string)
     const std::string& annotation(const std::string& name) const {
       return _beaminfo->annotation(name);
     }
 
     /// Get an annotation by name (as a string) with a default in case the annotation is not found
     const std::string& annotation(const std::string& name, const std::string& defaultreturn) const {
       return _beaminfo->annotation(name, defaultreturn);
     }
 
     /// @brief Get an annotation by name (copied to another type)
     ///
     /// @note Templated on return type
     template <typename T>
     const T annotation(const std::string& name) const {
       return _beaminfo->annotation<T>(name);
     }
 
     /// @brief Get an annotation by name (copied to another type) with a default in case the annotation is not found
     ///
     /// @note Templated on return type
     template <typename T>
     const T annotation(const std::string& name, T&& defaultreturn) const {
       return _beaminfo->annotation<T>(name, std::forward<T>(defaultreturn));
     }
 
     /// @brief Add or set an annotation by name (templated for remaining types)
     ///
     /// @note Templated on arg type, but stored as a string.
     template <typename T>
     void setAnnotation(const std::string& name, T&& value) {
       _beaminfo->annotation<T>(name, std::forward<T>(value));
     }
 
 
     /// Set all annotations at once
     void setAnnotations(const Annotations& anns) {
       _beaminfo->setAnnotations(anns);
     }
 
     /// Delete an annotation by name
     void rmAnnotation(const std::string& name) {
       _beaminfo->rmAnnotation(name);
     }
 
 
     /// Delete an annotation by name
     void clearAnnotations() {
       _beaminfo->clearAnnotations();
     }
 
     /// @}
 
 
     /// @name AO type handling
     /// @{
 
     /// Register an AO type handle into type map and YODA reader
     template<typename T>
     void registerType() {
       const std::string name = T().type();
       const TypeRegisterItr& res = _register.find(name);
       if (res == _register.end()) {
         _register[name] = make_shared<TypeHandle<T>>();
       }
       _reader.registerType<T>(); // also let YODA know
     }
 
     /// If @a dst is the same subclass as @a src, copy the contents of
     /// @a src into @a dst and return true. Otherwise return false.
     bool copyAO(YODA::AnalysisObjectPtr src, YODA::AnalysisObjectPtr dst, const double scale=1.0);
 
     /// If @a dst is the same subclass as @a src, scale the contents of @a src with
     /// @a scale and add it to @a dst and return true. Otherwise return false.
     bool addAO(YODA::AnalysisObjectPtr src, YODA::AnalysisObjectPtr& dst, const double scale);
 
     /// @}
 
 
     /// @name Analysis handling
     /// @{
 
     /// Get a list of the currently registered analyses' names.
     std::vector<std::string> analysisNames() const;
 
     /// Get a list of the official analysis names for this release.
     std::vector<std::string> stdAnalysisNames() const;
 
     /// Get the collection of currently registered analyses.
     const std::map<std::string, AnaHandle>& analysesMap() const {
       return _analyses;
     }
 
     /// Get the collection of currently registered analyses.
     std::vector<AnaHandle> analyses() const {
       std::vector<AnaHandle> rtn;
       rtn.reserve(_analyses.size());
       for (const auto& apair : _analyses) rtn.push_back(apair.second);
       return rtn;
     }
 
     /// Get a registered analysis by name.
     AnaHandle analysis(const std::string& analysisname) {
       if ( _analyses.find(analysisname) == _analyses.end() )
         throw LookupError("No analysis named '" + analysisname + "' registered in AnalysisHandler");
       try {
         return _analyses[analysisname];
       } catch (...) {
         throw LookupError("No analysis named '" + analysisname + "' registered in AnalysisHandler");
       }
     }
 
     /// Add an analysis to the run list by object
     AnalysisHandler& addAnalysis(Analysis* analysis);
 
     /// @brief Add an analysis to the run list using its name.
     ///
     /// The actual Analysis to be used will be obtained via
     /// AnalysisLoader::getAnalysis(string).  If no matching analysis is found,
     /// no analysis is added (i.e. the null pointer is checked and discarded.
     AnalysisHandler& addAnalysis(const std::string& analysisname);
 
     /// @brief Add an analysis with a map of analysis options.
     AnalysisHandler& addAnalysis(const std::string& analysisname, std::map<string, string> pars);
 
     /// @brief Add analyses to the run list using their names.
     ///
     /// The actual {@link Analysis}' to be used will be obtained via
     /// AnalysisHandler::addAnalysis(string), which in turn uses
     /// AnalysisLoader::getAnalysis(string). If no matching analysis is found
     /// for a given name, no analysis is added, but also no error is thrown.
     AnalysisHandler& addAnalyses(const std::vector<std::string>& analysisnames);
 
 
     /// Remove an analysis from the run list using its name.
     AnalysisHandler& removeAnalysis(const std::string& analysisname);
 
     /// Remove analyses from the run list using their names.
     AnalysisHandler& removeAnalyses(const std::vector<std::string>& analysisnames);
 
     /// @}
 
 
     /// @name Main init/execute/finalise
     /// @{
 
     /// Initialize a run, with the run beams taken from the example event
     void init(const GenEvent& event);
 
     /// @brief Analyze the given @a event by reference
     ///
     /// This function will call the AnalysisBase::analyze() function of all
     /// included analysis objects.
     ///
     /// @note Despite the event being passed as const, its units etc. may be changed, hence non-const.
     void analyze(GenEvent& event);
 
     /// @brief Analyze the given @a event by pointer
     ///
     /// This function will call the AnalysisBase::analyze() function of all
     /// included analysis objects, after checking the event pointer validity.
     void analyze(GenEvent* event);
 
     /// Finalize a run. This function calls the AnalysisBase::finalize()
     /// functions of all included analysis objects.
     void finalize();
 
     /// @}
 
 
     /// @name Histogram / data object access
     /// @{
 
     /// After all subevents in an event group have been processed, push
     /// all histo fills to the relevant histograms.
     void collapseEventGroup();
 
     /// @brief Read analysis plots into the histo collection from the given stream
     ///
     /// Use the @a fmt flag to specify the YODA output format (yoda, yoda.gz, yoda.h5, ...)
     void readData(std::istream& istr, const string& fmt, bool preload = true);
 
     /// Read analysis plots into the histo collection (via addData) from the named file.
     void readData(const std::string& filename, bool preload = true);
 
     /// Get all YODA analysis objects (across all weights, optionally including RAW)
     ///
     /// @note We'll live with the mixed-case "Yoda" here, since the consistent all-caps would be worse!
     vector<YODA::AnalysisObjectPtr> getYodaAOs(const bool includeraw=false, const bool mkinert=true) const;
 
     /// Get all raw YODA analysis objects (across all weights)
     vector<YODA::AnalysisObjectPtr> getRawAOs() const;
 
     /// Get all raw YODA analysis object paths (across all weights)
     vector<std::string> getRawAOPaths() const;
 
     /// Get a pointer to a preloaded yoda object with the given path,
     /// or null if path is not found.
     const YODA::AnalysisObjectPtr getPreload(const string& path) const {
       auto it = _preloads.find(path);
       if ( it == _preloads.end() ) return nullptr;
       return it->second;
     }
 
     /// @brief Write all analyses' plots (via getData) to the given stream.
     ///
     /// Use the @a fmt flag to specify the YODA output format (yoda, yoda.gz, yoda.h5, ...)
     void writeData(std::ostream& ostr, const string& fmt) const;
 
     /// Write all analyses' plots (via getData) to the named file.
     void writeData(const string& filename) const;
 
     /// @brief Configure the AnalysisObject dump rate and destination.
     ///
     /// Tell Rivet to dump intermediate result to a file named @a
     /// dumpfile every @a period'th event. If @a period is not positive,
     /// no periodic finalization will be done.
     void setFinalizePeriod(const string& dumpfile, int period) {
       _dumpPeriod = period;
       _dumpFile = dumpfile;
     }
     /// @brief Configure the AnalysisObject dump rate and destination.
     void setNoFinalizePeriod() {
       setFinalizePeriod("DUMMY", -1);
     }
 
     /// @brief Set filename of the bootstrap file
     void setBootstrapFilename(const string& filename) {
       _bootstrapfilename = filename;
     }
 
     /// Return a vector of (AO path, AO numBins) pairs to decode the fills layout
     vector<pair<string,size_t>> fillLayout() const;
 
     /// Return a vector of the binary fill outcome (was/wasn't filled) at each fill position
     vector<bool> fillOutcomes() const;
 
     /// Return a vector of the fill fraction at each fill position
     vector<double> fillFractions() const;
 
     /// @brief Merge the vector of YODA files, using the cross-section and weight information provided in each.
     ///
     /// Each file in @a aofiles is assumed to have been produced by Rivet. By
     /// default the files are assumed to contain different processes (or the
     /// same processs but mutually exclusive cuts), but if @a equiv if true, the
     /// files are assumed to contain output of completely equivalent (but
     /// statistically independent) Rivet runs. The corresponding analyses will
     /// be loaded and their analysis objects will be filled with the merged
     /// result. finalize() will be run on each relevant analysis. The resulting
     /// YODA file can then be written out by writeData().
     ///
     /// If @a delopts is non-empty, it is assumed to contain names of different
     /// options to be merged into the same analysis objects.
     ///
 
     void mergeYODAs(const vector<string>& aofiles,
                     const vector<string>& delopts=vector<string>(),
                     const vector<string>& addopts=vector<string>(),
                     const vector<string>& matches=vector<string>(),
                     const vector<string>& unmatches=vector<string>(),
                     const bool equiv=false, const bool reentrantOnly = true);
 
     /// A method to merge another AnalysisHandler into the current one
     void merge(AnalysisHandler &other);
 
     /// @brief A method to prepare a re-entrant run for a given set
     /// of AO paths and serialized AO data
     ///
     /// The @a unscale parameter multiplies fillable objects with sumW/xsec to counteract
     /// the cross-section scaling in finalize() when merging different processes (non-equiv)
     void loadAOs(const vector<string>& aoPaths, const vector<double>& aoData);
 
     /// @}
 
     /// @name MPI (de-)serialisation
     ///@{
 
     vector<double> serializeContent(bool fixed_length = false) {
       if (!_initialised)
         throw Error("AnalysisHandler has not been initialised!");
 
       collapseEventGroup();
 
       // Loop over raw AOs and work out the size of the content data
       const vector<YODA::AnalysisObjectPtr> raos = getRawAOs();
       size_t total = 0;
       for (size_t i = 0; i < raos.size(); ++i) {
         total += raos[i]->lengthContent(fixed_length)+1;
       }
       total += _beaminfo->numBins()+1;
 
       // Loop over raw AOs and retrieve the content data
       std::vector<double> data; // serialized data vector
       data.reserve(total); // pre-allocate enough memory
       // Add beam IDs
       data.push_back(_beaminfo->numBins());
       for (const string& beamID : _beaminfo->xEdges()) {
         data.push_back(_beamInfoLabelToID(beamID));
       }
       // Add raw YODA AO content
       for (size_t i = 0; i < raos.size(); ++i) {
         vector<double> tmp = raos[i]->serializeContent(fixed_length);
         data.push_back(tmp.size()); // length of the AO
         data.insert(std::end(data),
                     std::make_move_iterator(std::begin(tmp)),
                     std::make_move_iterator(std::end(tmp)));
       }
       return data;
     }
 
     void deserializeContent(const vector<double>& data, size_t nprocs = 0) {
       if (!_initialised)
         throw Error("AnalysisHandler has not been initialised!");
 
       collapseEventGroup();
 
       // get Rivet AOs for access to raw AO pointers
       vector<MultiplexAOPtr> raos = getRivetAOs();
 
 
       // beam info first
       size_t iAO = 0, iW = 0, nBeams = data[0], offset = 1;
       if (nprocs)  nBeams /= nprocs;
       const auto itr = data.cbegin();
       // set beam IDs
       vector<int> edges{itr+offset, itr+offset+nBeams};
       vector<string> labels; labels.reserve(edges.size());
       size_t id = 0;
       for (int edge : edges) {
         if (nprocs >= 2)  edge /= nprocs;
         labels.push_back(_mkBeamInfoLabel(++id, edge));
       }
 
       _beaminfo = make_shared<YODA::BinnedEstimate<string>>(labels, "/TMP/_BEAMPZ");
       offset += nBeams;
       // set beam momenta
       size_t beamLen = *(itr + offset); ++offset;
       if (nprocs)  beamLen /= nprocs;
       std::vector<double> energies{itr+offset, itr+offset+beamLen};
       if (nprocs >= 2) {
         for (double& e : energies) { e /= nprocs; }
       }
       _beaminfo->deserializeContent(energies);
       for (auto& b : _beaminfo->bins(true))  b.rmErrs();
       offset += beamLen;
 
       // then the multiweighted AOs
       while (offset < data.size()) {
         if (iW < numWeights())  raos[iAO].get()->setActiveWeightIdx(iW);
         else {
           raos[iAO].get()->unsetActiveWeight();
           iW = 0; ++iAO; // move on to next AO
           raos[iAO].get()->setActiveWeightIdx(iW);
         }
 
         // obtain content length and set content iterators
         size_t aoLen = *(itr + offset); ++offset;
         if (nprocs)  aoLen /= nprocs;
         auto first = itr + offset;
         auto last = first + aoLen;
         // load data into AO
         raos[iAO].get()->activeAO()->deserializeContent(std::vector<double>{first, last});
 
         ++iW; offset += aoLen; // increment offset
       }
       raos[iAO].get()->unsetActiveWeight();
       // Reset cross-section bookkeeping
       _ntrials = 0.0;
       _fileCounter = CounterPtr(weightNames(), Counter("_FILECOUNT"));
       _xserr = CounterPtr(weightNames(), Counter("XSECERR"));
       if (nprocs >= 2) {
         for (size_t iW = 0; iW < numWeights(); ++iW) {
           *_fileCounter.get()->persistent(iW) = *_eventCounter.get()->persistent(iW);
           _xs.get()->persistent(iW)->scale(1.0/nprocs);
         }
       }
     }
 
     /// @}
 
 
     /// @name Processing stage
     /// @{
 
     /// Indicate which Rivet stage we're in.
     /// At the moment, only INIT is used to enable booking.
     enum class Stage { OTHER, INIT, FINALIZE };
 
     /// Return the current processing stage.
     Stage stage() const { return _stage; }
 
     /// @}
 
   private:
 
     /// @name Internal helper functions
     /// @{
 
     /// Get a logger object.
     Log& getLog() const;
 
     /// Get all multi-weight Rivet analysis object wrappers.
     vector<MultiplexAOPtr> getRivetAOs() const;
 
     /// Helper function to strip specific options from data object paths.
     void stripOptions(YODA::AnalysisObjectPtr ao, const vector<string>& delopts) const;
 
     /// @brief Merge the AO map @a newaos into @a allaos
     void mergeAOS(map<string, YODA::AnalysisObjectPtr> &allaos,
                   const map<string, YODA::AnalysisObjectPtr> &newaos,
                   map<string, std::array<double,4>> &allxsecs,
                   const vector<string>& delopts=vector<string>(),
                   const vector<string>& optAnas=vector<string>(),
                   const vector<string>& optKeys=vector<string>(),
                   const vector<string>& optVals=vector<string>(),
                   const bool equiv=false,
                   const bool overwrite_xsec = false,
                   const double user_xsec = 1.0);
 
 
     /// @brief A method to prepare a re-entrant run for a given set of analysis objects
     ///
     /// The @a unscale parameter multiplies fillable objects with sumW/xsec to counteract
     /// the cross-section scaling in finalize() when merging different processes (non-equiv)
     void loadAOs(const map<string, YODA::AnalysisObjectPtr>& allAOs,
                  const bool unscale = false, const bool reentrantOnly = true);
 
     /// @brief A method to set the internal _beaminfo object from a pair of beams
     void _setRunBeamInfo(const ParticlePair& beams);
 
     /// @brief A method to set the internal _beaminfo object from an existing YODA AO
     void _setRunBeamInfo(YODA::AnalysisObjectPtr ao);
 
     /// Construct beaminfo label from ID
     string _mkBeamInfoLabel(size_t n, PdgId id) {
       return "BEAM"+std::to_string(n)+"("+std::to_string(id)+")";
     }
 
     /// Retrieve ID from beaminfo label
     PdgId _beamInfoLabelToID(const string& label) {
       size_t pos = label.find("(");
       string beamID = label.substr(pos+1, label.size()-pos-2);
       return std::stoi(beamID);
     }
 
 
     /// @}
 
 
   private:
 
     /// Current handler processing stage.
     Stage _stage = Stage::OTHER;
 
     /// The collection of Analysis objects to be used.
     std::map<std::string, AnaHandle> _analyses;
 
     /// A vector of pre-loaded object which do not have a valid Analysis plugged in.
     ///
     /// @todo Rename to _preloadedAOs for consistency
     map<string,YODA::AnalysisObjectPtr> _preloads;
 
     /// A vector containing copies of analysis objects after finalize() has been run.
     vector<YODA::AnalysisObjectPtr> _finalizedAOs;
 
     /// Loads a default set of YODA AO types into the TypeHandleMap
     template<typename... Args>
     void registerDefaultTypes();
 
     /// The TypeRegister of all registered types
     TypeRegister _register;
 
     /// A reference to the ReaderYODA singleton
     YODA::Reader& _reader = YODA::ReaderYODA::create();
 
 
     /// @name Run properties
     /// @{
 
     /// Weight names
     std::vector<std::string> _weightNames;
     std::vector<std::valarray<double> > _subEventWeights;
     //size_t _numWeightTypes; // always == WeightVector.size()
 
     /// Weight indices
     std::vector<size_t> _weightIndices;
 
     /// Event counter
     CounterPtr _eventCounter;
 
     /// Cross-section known to AH
     Estimate0DPtr _xs;
 
     /// Running average of the cross-section uncertainties
     CounterPtr _xserr;
 
     /// Beam info known to AH
     YODA::BinnedEstimatePtr<string> _beaminfo;
 
     /// Total number of trials
     double _ntrials;
 
     /// Total number of entries of the current HepMC file
     CounterPtr _fileCounter;
 
     /// Toggle for multi-file runs
     bool _isEndOfFile;
 
     /// Nominal cross-section
     std::pair<double,double> _userxs;
 
     /// Beams used by this run.
     ParticlePair _beams;
 
     /// Flag to check if init has been called
     bool _initialised;
 
     /// Flag whether input event beams should be ignored in compatibility check
     bool _checkBeams;
 
     /// Flag to check if multiweights should be ignored
     bool _skipMultiWeights;
 
     /// String of weight names (or regex) to select multiweights
     std::string _matchWeightNames;
 
     /// String of weight names (or regex) to veto multiweights
     std::string _unmatchWeightNames;
 
     /// String giving the nominal weight name
     std::string _nominalWeightName;
 
     /// weight cap value
     double _weightCap;
 
     /// The relative width of the NLO smearing window.
     ///
     /// @todo Improve & standardise name
     double _NLOSmearing;
 
     /// Current event number
     int _eventNumber;
 
     /// The index in the (original) weight vector for the nominal weight stream
     size_t _defaultWeightIdx;
 
     /// The index in the (possibly pruned) weight vector for the nominal weight stream
     size_t _rivetDefaultWeightIdx;
 
     /// The index of the (possibly user-specified) intended default stream
     int _customDefaultWeightIdx;
 
     /// How often Rivet runs finalize() and writes the result to a YODA file.
     int _dumpPeriod;
 
     /// The name of a YODA file to which Rivet periodically dumps results.
     string _dumpFile;
 
     /// Flag to indicate periodic AO dumping is in progress
     bool _dumping;
 
     /// Flag to indicate bootstrap dumping is in progress
     ofstream _fbootstrap;
 
     /// Name of the file that the bootstrap dumping should be written to
     std::string _bootstrapfilename;
 
     /// Projection Handler
     ProjectionHandler _projHandler;
 
     /// @}
 
   };
 
 
 }
 
 #endif

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