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 // -*- C++ -*-
 //
 // FxFxReader.h is a part of ThePEG - Toolkit for HEP Event Generation
 // Copyright (C) 1999-2019 Leif Lonnblad
 //
 // ThePEG is licenced under version 3 of the GPL, see COPYING for details.
 // Please respect the MCnet academic guidelines, see GUIDELINES for details.
 //
 #ifndef THEPEG_FxFxReader_H
 #define THEPEG_FxFxReader_H
 // This is the declaration of the FxFxReader class.
 
 #include "FxFx.h"
 #include "ThePEG/Handlers/HandlerBase.h"
 #include "ThePEG/Utilities/ObjectIndexer.h"
 #include "ThePEG/Utilities/Exception.h"
 #include "ThePEG/Utilities/XSecStat.h"
 #include "ThePEG/PDF/PartonBinInstance.h"
 #include "ThePEG/PDF/PartonBin.fh"
 #include "ThePEG/MatrixElement/ReweightBase.h"
 #include "FxFxEventHandler.fh"
 #include "FxFxReader.fh"
 #include "ThePEG/Utilities/CFile.h"
 #include <cstdio>
 #include <cstring>
 
 namespace ThePEG {
 
 /**
  * FxFxReader is an abstract base class to be used for objects
  * which reads event files or streams from matrix element
  * generators. Derived classes must at least implement the open() and
  * doReadEvent() methods to read in information about the whole run into
  * the HEPRUP variable and next event into the HEPEUP variable
  * respectively. Also the close() function to close the file or stream
  * read must be implemented. Although these functions are named as if
  * we are reading from event files, they could just as well implement
  * the actual generation of events.
  *
  * After filling the HEPRUP and HEPEUP variables, which are protected
  * and easily accesible from the sub-class, this base class will then
  * be responsible for transforming this data to the ThePEG Event
  * record in the getEvent() method. <code>FxFxReader</code>s can
  * only be used inside FxFxEventHandler objects.
  *
  * In the initialization the virtual open() and scan() functions are
  * called. Here the derived class must provide the information about
  * the processes in the variables corresponding to the HEPRUP common
  * block. Note that the IDWTUP is required to be +/- 1, and sub
  * classes are required to change the information accordingly to
  * ensure the correct corss section sampling. Note also that the
  * controlling FxFxEventHandler may choose to generate weighted
  * events even if IDWTUP is 1.
  *
  * Note that the information given per process in e.g. the XSECUP and
  * XMAXUP vectors is not used by the FxFxEventHandler and by
  * default the FxFxReader is not assumed to be able to actively
  * choose between the sub-processes. Instead, the
  * FxFxEventHandler can handle several FxFxReader objects
  * and choose between them. However, a sub-class of FxFxReader
  * may set the flag isActive, in which case it is assumed to be able
  * to select between its sub-processes itself.
  *
  * The FxFxReader may be assigned a number ReweightBase objects
  * which either completely reweights the events produced (in the
  * reweights vector), or only biases the selection without influencing
  * the cross section (in the preweights vector). Note that it is the
  * responsibility of a sub-class to call the reweight() function and
  * multiply the weight according to its return value (typically done
  * in the readEvent() function).
  *
  * @see \ref FxFxReaderInterfaces "The interfaces"
  * defined for FxFxReader.
  * @see Event
  * @see FxFxEventHandler
  */
 class FxFxReader: public HandlerBase, public LastXCombInfo<> {
 
   /**
    * FxFxEventHandler should have access to our private parts.
    */
   friend class FxFxEventHandler;
 
   /**
    * Map for accumulating statistics of cross sections per process
    * number.
    */
   typedef map<int,XSecStat> StatMap;
 
   /**
    * Map of XComb objects describing the incoming partons indexed by
    * the corresponding PartonBin pair.
    */
   typedef map<tcPBPair,XCombPtr> XCombMap;
 
   /**
    * A vector of pointers to ReweightBase objects.
    */
   typedef vector<ReweightPtr> ReweightVector;
 
 public:
 
   /** @name Standard constructors and destructors. */
   //@{
   /**
    * Default constructor. If the optional argument is true, the reader
    * is assumed to be able to produce events on demand for a given
    * process.
    */
   FxFxReader(bool active = false);
 
   /**
    * Copy-constructor.
    */
   FxFxReader(const FxFxReader &);
 
   /**
    * Destructor.
    */
   virtual ~FxFxReader();
   //@}
 
 public:
 
   /** @name Main virtual fuctions to be overridden in
    *  sub-classes. They are named as if we are reading from event
    *  files, but could equally well implement the actual generation of
    *  events. */
   //@{
   /**
    * Open a file or stream with events and read in the run information
    * into the heprup variable.
    */
   virtual void open() = 0;
 
   /**
    * Read the next event from the file or stream into the
    * corresponding protected variables. Return false if there is no
    * more events.
    */
   virtual bool doReadEvent() = 0;
 
   /**
    * Close the file or stream from which events have been read.
    */
   virtual void close() = 0;
 
   /**
    * return the weight names 
    */
   //  virtual vector<string> optWeightsNamesFunc();
   virtual vector<string> optWeightsNamesFunc() = 0;
   //virtual vector<string*> optWeightNamesFunc() = 0;
   vector<string> optionalWeightsNames;
   
   /** 
    * The ID (e.g. 100x, 2001) for the weight
    */ 
 
   // vector<string> optionalWeightsNames;
 
   
   //@}
 
   /** @name Other important function which may be overridden in
    *  sub-classes which wants to bypass the basic HEPRUP or HEPEUP
    *  variables or otherwise facilitate the conversion to ThePEG
    *  objects. */
   //@{
   /**
    * Initialize. This function is called by the FxFxEventHandler
    * to which this object is assigned.
    */
   virtual void initialize(FxFxEventHandler & eh);
 
   /**
    * Calls readEvent() or uncacheEvent() to read information into the
    * FxFx common block variables. This function is called by the
    * FxFxEventHandler if this reader has been selectod to
    * produce an event.
    *
    * @return the weight asociated with this event. If negative weights
    * are allowed it should be between -1 and 1, otherwise between 0
    * and 1. If outside these limits the previously estimated maximum
    * is violated. Note that the estimated maximum then should be
    * updated from the outside.
    */
   virtual double getEvent();
 
   /**
    * Calls doReadEvent() and performs pre-defined reweightings. A
    * sub-class overrides this function it must make sure that the
    * corresponding reweightings are done.
    */
   virtual bool readEvent();
 
   /**
    * Skip \a n events. Used by FxFxEventHandler to make sure
    * that a file is scanned an even number of times in case the events
    * are not ramdomly distributed in the file.
    */
   virtual void skip(long n);
 
   /**
    * Get an XComb object. Converts the information in the Les Houches
    * common block variables to an XComb object describing the sub
    * process. This is the way information is conveyed from the reader
    * to the controlling FxFxEventHandler.
    */
   tXCombPtr getXComb();
 
   /**
    * Get a SubProcess object corresponding to the information in the
    * Les Houches common block variables.
    */
   tSubProPtr getSubProcess();
 
   /**
    * Scan the file or stream to obtain information about cross section
    * weights and particles etc. This function should fill the
    * variables corresponding to the /HEPRUP/ common block. The
    * function returns the number of events scanned.
    */
   virtual long scan();
 
   /**
    * Take the information corresponding to the HEPRUP common block and
    * initialize the statistics for this reader.
    */
   virtual void initStat();
 
   /**
    * Reweights the current event using the reweights and preweights
    * vectors. It is the responsibility of the sub-class to call this
    * function after the HEPEUP information has been retrieved.
    */
   double reweight();
 
   /**
    * Converts the information in the Les Houches common block
    * variables into a Particle objects.
    */
   virtual void fillEvent();
 
   /**
    * Removes the particles created in the last generated event,
    * preparing to produce a new one.
    */
   void reset();
 
   /**
    * Possibility for subclasses to recover from non-conformant
    * settings of XMAXUP when an event file has been scanned with \a
    * neve events. Should set weightScale so that the average XMAXUP
    * times weightScale gives the cross section for a process. (This is
    * needed for MadEvent).
    */
   virtual void setWeightScale(long neve);
 
   //@}
 
   /** @name Access information about the current event. */
   //@{
 
   /**
    * Return the size of this event in bytes. To be used for the cache
    * file. \a npart is the number of particles. If \a npart is 0, the
    * number is taken from NUP.
    */
   static size_t eventSize(int N) {
     return (N + 1)*sizeof(int) +       // IDPRUP, ISTUP
       (7*N + 4)*sizeof(double) +       // XWGTUP, SCALUP, AQEDUP, AQCDUP, PUP,
                                        // VTIMUP, SPINUP
       N*sizeof(long) +                 // IDUP
       2*N*sizeof(pair<int,int>) +      // MOTHUP, ICOLUP
       sizeof(pair<double,double>) +    // XPDWUP.
       2*sizeof(double);                // lastweight and preweight
   }
 
   /**
    * The current event weight given by XWGTUP times possible
    * reweighting. Note that this is not necessarily the same as what
    * is returned by getEvent(), which is scaled with the maximum
    * weight.
    */
   double eventWeight() const { return hepeup.XWGTUP*lastweight; }
 
   /**
    * Return the optional named weights associated to the current event.
    */
   const map<string,double>& optionalEventWeights() const { return optionalWeights; }
 
   /** 
    * Return the Les Houches event number associated with the current event
    */
   const long& LHEEventNum() const { return LHEeventnum; }
 
   /**
    * Return the optional npLO and npNLO
    */
   const int& optionalEventnpLO() const { return optionalnpLO; }
   const int& optionalEventnpNLO() const { return optionalnpNLO; }
   
   /**
    * The pair of PartonBinInstance objects describing the current
    * incoming partons in the event.
    */
   const PBIPair & partonBinInstances() const { return thePartonBinInstances; }
   /**
    * Return the instances of the beam particles for the current event.
    */
   const PPair & beams() const { return theBeams; }
   /**
    * Return the instances of the incoming particles to the sub process
    * for the current event.
    */
   const PPair & incoming() const { return theIncoming; }
   /**
    * Return the instances of the outgoing particles from the sub process
    * for the current event.
    */
   const PVector & outgoing() const { return theOutgoing; }
   /**
    * Return the instances of the intermediate particles in the sub
    * process for the current event.
    */
   const PVector & intermediates() const { return theIntermediates; }
   /**
    * If this reader is to be used (possibly together with others) for
    * CKKW reweighting and veto, this should give the multiplicity of
    * outgoing particles in the highest multiplicity matrix element in
    * the group.
    */
   int maxMultCKKW() const { return theMaxMultCKKW; }
   /**
    * If this reader is to be used (possibly together with others) for
    * CKKW reweighting and veto, this should give the multiplicity of
    * outgoing particles in the lowest multiplicity matrix element in
    * the group.
    */
   int minMultCKKW() const { return theMinMultCKKW; }  //@}
 
   /** @name Other inlined access functions. */
   //@{
   /**
    * The number of events found in this reader. If less than zero the
    * number of events are unlimited.
    */
   long NEvents() const { return theNEvents; }
 
   /**
    * The number of events produced so far. Is reset to zero if an
    * event file is reopened.
    */
   long currentPosition() const { return position; }
 
   /**
    * The maximum number of events to scan to collect information about
    * processes and cross sections. If less than 0, all events will be
    * scanned.
    */
   long maxScan() const { return theMaxScan; }
 
   /**
    * Return true if this reader is active.
    */
   bool active() const { return isActive; }
 
   /**
    * True if negative weights may be produced.
    */
   bool negativeWeights() const { return heprup.IDWTUP < 0; }
 
   /**
    * The collected cross section statistics for this reader.
    */
   const XSecStat & xSecStats() const { return stats; }
 
   /**
    * Collected statistics about the individual processes.
    */
   const StatMap & processStats() const { return statmap; }
 
   /**
    * Select the current event. It will later be rejected with a
    * probability given by \a weight.
    */
   void select(double weight) {
     stats.select(weight);
     statmap[hepeup.IDPRUP].select(weight);
   }
 
   /**
    * Accept the current event assuming it was previously selcted.
    */
   void accept() {
     stats.accept();
     statmap[hepeup.IDPRUP].accept();
   }
 
   /**
    * Reject the current event assuming it was previously accepted.
    */
   void reject(double w) {
     stats.reject(w);
     statmap[hepeup.IDPRUP].reject(w);
   }
 
   /**
    * Increase the overestimated cross section for this reader.
    */
   virtual void increaseMaxXSec(CrossSection maxxsec);
 
   /**
    * The PartonExtractor object used to construct remnants.
    */
   tPExtrPtr partonExtractor() const { return thePartonExtractor; }
 
   /**
    * Return a possibly null pointer to a CascadeHandler to be used for
    * CKKW-reweighting.
    */
   tCascHdlPtr CKKWHandler() const { return theCKKW; }
 
   /**
    * The pairs of PartonBin objects describing the partons which can
    * be extracted by the PartonExtractor object.
    */
   const PartonPairVec & partonBins() const { return thePartonBins; }
 
   /**
    * The map of XComb objects indexed by the corresponding PartonBin
    * pair.
    */
   const XCombMap & xCombs() const { return theXCombs; }
 
   /**
    * The Cuts object to be used for this reader.
    */
   const Cuts & cuts() const { return *theCuts; }
 
   //@}
 
 protected:
 
   /** @name Functions for manipulating cache files. */
   //@{
 
   /**
    * Name of file used to cache the events form the reader in a
    * fast-readable form. If empty, no cache file will be generated.
    */
   string cacheFileName() const { return theCacheFileName; }
 
   /**
    * Determines whether to apply cuts to events converting them to
    * ThePEG format.
    */
   bool cutEarly() const { return doCutEarly; }
 
   /**
    * File stream for the cache.
    */
   CFile cacheFile() const { return theCacheFile;}
 
   /**
    * Open the cache file for reading.
    */
   void openReadCacheFile();
 
   /**
    * Open the cache file for writing.
    */
   void openWriteCacheFile();
 
   /**
    * Close the cache file;
    */
   void closeCacheFile();
 
   /**
    * Write the current event to the cache file.
    */
   void cacheEvent() const;
 
   /**
    * Read an event from the cache file. Return false if something went wrong.
    */
   bool uncacheEvent();
 
   /**
    * Reopen a reader. If we have reached the end of an event file,
    * reopen it and issue a warning if we have used up a large fraction
    * of it.
    */
   void reopen();
 
   /**
    * Helper function to write a variable to a memory location
    */
   template <typename T>
   static char * mwrite(char * pos, const T & t, size_t n = 1) {
     std::memcpy(pos, &t, n*sizeof(T));
     return pos + n*sizeof(T);
   }
 
   /**
    * Helper function to read a variable from a memory location
    */
   template <typename T>
   static const char * mread(const char * pos, T & t, size_t n = 1) {
     std::memcpy(&t, pos, n*sizeof(T));
     return pos + n*sizeof(T);
   }
 
   //@}
 
   /** @name Auxilliary virtual methods which may be verridden by sub-classes. */
   //@{
   /**
    * Check the existence of a pair of PartonBin objects corresponding
    * to the current event.
    *
    * @return false if no pair of suitable PartonBin objects was found.
    */
   virtual bool checkPartonBin();
 
   /**
    * Create instances of all particles in the event and store them
    * in particleIndex.
    */
   virtual void createParticles();
 
   /**
    * Using the already created particles create a pair of
    * PartonBinInstance objects corresponding to the incoming
    * partons. Return the corresponding PartonBin objects.
    */
   virtual tcPBPair createPartonBinInstances();
 
   /**
    * Create instances of the incoming beams in the event and store
    * them in particleIndex. If no beam particles are included in the
    * event they are created from the run info.
    */
   virtual void createBeams();
 
   /**
    * Go through the mother indices and connect up the Particles.
    */
   virtual void connectMothers();
   //@}
 
 public:
 
   /** @name Functions used by the persistent I/O system. */
   //@{
   /**
    * Function used to write out object persistently.
    * @param os the persistent output stream written to.
    */
   void persistentOutput(PersistentOStream & os) const;
 
   /**
    * Function used to read in object persistently.
    * @param is the persistent input stream read from.
    * @param version the version number of the object when written.
    */
   void persistentInput(PersistentIStream & is, int version);
   //@}
 
   /**
    * Standard Init function used to initialize the interfaces.
    */
   static void Init();
 
 protected:
 
   /** @name Set functions for some variables not in the Les Houches accord. */
   //@{
   /**
    * The number of events in this reader. If less than zero the number
    * of events is unlimited.
    */
   void NEvents(long x) { theNEvents = x; }
 
   /**
    * The map of XComb objects indexed by the corresponding PartonBin
    * pair.
    */
   XCombMap & xCombs() { return theXCombs; }  
   //@}
 
   /** @name Standard (and non-standard) Interfaced functions. */
   //@{
   /**
    * Initialize this object after the setup phase before saving an
    * EventGenerator to disk.
    * @throws InitException if object could not be initialized properly.
    */
   virtual void doinit();
 
   /**
    * Initialize this object. Called in the run phase just before
    * a run begins.
    */
   virtual void doinitrun();
 
   /**
    * Finalize this object. Called in the run phase just after a
    * run has ended. Used eg. to write out statistics.
    */
   virtual void dofinish() {
     close();
     HandlerBase::dofinish();
   }
 
   /**
    * Return true if this object needs to be initialized before all
    * other objects because it needs to extract PDFs from the event file.
    */
   virtual bool preInitialize() const;
 
   /**
    * Called from doinit() to extract PDFs from the event file and add
    * the corresponding objects to the current EventGenerator.
    */
   virtual void initPDFs();
   //@}
 
 protected:
 
   /**
    * The HEPRUP common block.
    */
   HEPRUP heprup;
 
   /**
    * The HEPEUP common block.
    */
   HEPEUP hepeup;
 
   /**
    * The ParticleData objects corresponding to the incoming particles.
    */
   tcPDPair inData;
 
   /**
    * The PDFBase objects which has been used for the beam particle
    * when generating the events being read. Specified in the interface
    * or derived from PDFGUP and PDFSUP.
    */
   pair<PDFPtr,PDFPtr> inPDF;
 
   /**
    * The PDFBase object to be used in the subsequent generation.
    */
   pair<cPDFPtr,cPDFPtr> outPDF;
 
   /**
    * The PartonExtractor object used to construct remnants.
    */
   PExtrPtr thePartonExtractor;
 
   /**
    * A pointer to a CascadeHandler to be used for CKKW-reweighting.
    */
   tCascHdlPtr theCKKW;
 
   /**
    * The pairs of PartonBin objects describing the partons which can
    * be extracted by the PartonExtractor object.
    */
   PartonPairVec thePartonBins;
 
   /**
    * The map of XComb objects indexed by the corresponding PartonBin
    * pair.
    */
   XCombMap theXCombs;
 
   /**
    * The Cuts object to be used for this reader.
    */
   CutsPtr theCuts;
 
   /**
    * The number of events in this reader. If less than zero the number
    * of events is unlimited.
    */
   long theNEvents;
 
   /**
    * The number of events produced by this reader so far. Is reset
    * every time an event file is reopened.
    */
   long position;
 
   /**
    * The number of times this reader has been reopened.
    */
   int reopened;
 
   /**
    * The maximum number of events to scan to collect information about
    * processes and cross sections. If less than 0, all events will be
    * scanned.
    */
   long theMaxScan;
 
   /**
    * Flag to tell whether we are in the process of scanning.
    */
   bool scanning;
 
   /**
    * True if this is an active reader.
    */
   bool isActive;
 
   /**
    * Name of file used to cache the events form the reader in a
    * fast-readable form. If empty, no cache file will be generated.
    */
   string theCacheFileName;
 
   /**
    * Determines whether to apply cuts to events before converting them
    * to ThePEG format.
    */
   bool doCutEarly;
 
   /**
    * Collect statistics for this reader.
    */
   XSecStat stats;
 
   /**
    * Collect statistics for each individual process.
    */
   StatMap statmap;
 
   /**
    * The pair of PartonBinInstance objects describing the current
    * incoming partons in the event.
    */
   PBIPair thePartonBinInstances;
 
   /**
    * Association between ColourLines and colour indices in the current
    * translation.
    */
   ObjectIndexer<long,ColourLine> colourIndex;
 
   /**
    * Association between Particles and indices in the current
    * translation.
    */
   ObjectIndexer<long,Particle> particleIndex;
 
   /**
    * The instances of the beam particles for the current event.
    */
   PPair theBeams;
 
   /**
    * The instances of the incoming particles to the sub process for
    * the current event.
    */
   PPair theIncoming;
 
   /**
    * The instances of the outgoing particles from the sub process for
    * the current event.
    */
   PVector theOutgoing;
 
   /**
    * The instances of the intermediate particles in the sub process for
    * the current event.
    */
   PVector theIntermediates;
 
   /**
    * File stream for the cache.
    */
   CFile theCacheFile;
 
   /**
    * The reweight objects modifying the weights of this reader.
    */
   ReweightVector reweights;
 
   /**
    * The preweight objects modifying the weights of this reader.
    */
   ReweightVector preweights;
 
   /**
    * The factor with which this reader was last pre-weighted.
    */
   double preweight;
 
   /**
    * Should the event be reweighted by PDFs used by the PartonExtractor?
    */
   bool reweightPDF;
 
   /**
    * Should PDFBase objects be constructed from the information in the
    * event file in the initialization?
    */
   bool doInitPDFs;
 
   /**
    * If this reader is to be used (possibly together with others) for
    * CKKW reweighting and veto, this should give the multiplicity of
    * outgoing particles in the highest multiplicity matrix element in
    * the group.
    */
   int theMaxMultCKKW;
 
   /**
    * If this reader is to be used (possibly together with others) for
    * CKKW reweighting and veto, this should give the multiplicity of
    * outgoing particles in the lowest multiplicity matrix element in
    * the group.
    */
   int theMinMultCKKW;
 
   /**
    * The weight multiplying the last read event due to PDF
    * reweighting, CKKW reweighting or assigned reweight and preweight
    * objects.
    */
   double lastweight;
 
   /**
    * The optional weights associated to the last read events.
    */
   map<string,double> optionalWeights;
   
   /**
    * The event number
    */
   long LHEeventnum;
 
    /**
    * If the maximum cross section of this reader has been increased
    * with increaseMaxXSec(), this is the total factor with which it
    * has been increased.
    */
   double maxFactor;
 
   /**
    * npLO for FxFx merging
    */
   int optionalnpLO;
 
  /**
    * npNLO for FxFx merging
    */
   int optionalnpNLO;
 
   /**
    * The (reweighted) XWGTUP value should be scaled with this cross
    * section when compared to the overestimated cross section.
    */
   CrossSection weightScale;
 
   /**
    * Individual scales for different sub-processes if reweighted.
    */
   vector<double> xSecWeights;
 
   /**
    * Individual maximum weights for individual (possibly reweighted)
    * processes.
    */
   map<int,double> maxWeights;
 
   /**
    * Is set to true when getEvent() is called from skip(int).
    */
   bool skipping;
 
   /**
    *  Option for the treatment of the momenta supplied
    */
   unsigned int theMomentumTreatment;
 
   /**
    * Set to true if warnings about possible weight incompatibilities
    * should be issued.
    */
   bool useWeightWarnings;
 
   /**
    *  Option to allow reopening of the file
    */
   bool theReOpenAllowed;
 
   /**
    *  Use the spin information
    */
   bool theIncludeSpin;
 
 private:
 
   /** Access function for the interface. */
   void setBeamA(long id);
   /** Access function for the interface. */
   long getBeamA() const;
   /** Access function for the interface. */
   void setBeamB(long id);
   /** Access function for the interface. */
   long getBeamB() const;
   /** Access function for the interface. */
   void setEBeamA(Energy e);
   /** Access function for the interface. */
   Energy getEBeamA() const;
   /** Access function for the interface. */
   void setEBeamB(Energy e);
   /** Access function for the interface. */
   Energy getEBeamB() const;
   /** Access function for the interface. */
   void setPDFA(PDFPtr);
   /** Access function for the interface. */
   PDFPtr getPDFA() const;
   /** Access function for the interface. */
   void setPDFB(PDFPtr);
   /** Access function for the interface. */
   PDFPtr getPDFB() const;
 
 private:
 
   /**
    * Describe an abstract base class with persistent data.
    */
   static AbstractClassDescription<FxFxReader> initFxFxReader;
 
   /**
    * Private and non-existent assignment operator.
    */
   FxFxReader & operator=(const FxFxReader &) = delete;
 
 public:
 
   /** @cond EXCEPTIONCLASSES */
   /** Exception class used by FxFxReader in case inconsistencies
    *  are encountered. */
   class FxFxInconsistencyError: public Exception {};
   
   /** Exception class used by FxFxReader in case more events
       than available are requested. */
   class FxFxReopenWarning: public Exception {};
 
   /** Exception class used by FxFxReader in case reopening an
       event file fails. */
   class FxFxReopenError: public Exception {};
 
   /** Exception class used by FxFxReader in case there is
       information missing in the initialization phase. */
   class FxFxInitError: public InitException {};
   /** @endcond */
 
 };
 
 /// Stream output for HEPEUP
 ostream & operator<<(ostream & os, const HEPEUP & h);
 
 }
 
 
 #include "ThePEG/Utilities/ClassTraits.h"
 
 namespace ThePEG {
 
 /** @cond TRAITSPECIALIZATIONS */
 
 /**
  * This template specialization informs ThePEG about the
  * base class of FxFxReader.
  */
 template <>
 struct BaseClassTrait<FxFxReader,1>: public ClassTraitsType {
   /** Typedef of the base class of FxFxReader. */
   typedef HandlerBase NthBase;
 };
 
 /**
  * This template specialization informs ThePEG about the name of the
  * FxFxReader class and the shared object where it is
  * defined.
  */
 template <>
 struct ClassTraits<FxFxReader>
   : public ClassTraitsBase<FxFxReader> {
   /**
    * Return the class name.
    */
   static string className() { return "Herwig::FxFxReader"; }
   /**
    * Return the name of the shared library to be loaded to get access
    * to the FxFxReader class and every other class it uses
    * (except the base class).
    */
   static string library() { return "HwFxFx.so"; }
 
 };
 
 /** @endcond */
 
 }
 
 #endif /* THEPEG_FxFxReader_H */

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