Pythia6Service.h

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#ifndef gen_Pythia6Service_h
#define gen_Pythia6Service_h

#include <vector>

#include "FWCore/ParameterSet/interface/ParameterSetfwd.h"
#include "FWCore/Utilities/interface/Exception.h"

#include "GeneratorInterface/Core/interface/FortranInstance.h"

// #include "HepMC/PythiaWrapper6_2.h"

namespace CLHEP {
   class HepRandomEngine;
}

namespace gen
{

   // the callbacks from Pythia which are passed on to the Pythia6Service
   extern "C" {
      double pyr_(int* idummy);
   }

   class Pythia6Service : public FortranInstance
   {
      public:         
         // ctor & dtor
         Pythia6Service();
     Pythia6Service( edm::ParameterSet const& );
     ~Pythia6Service() override ; 
     
         void setGeneralParams();
         void setCSAParams();
         void setSLHAParams();
         void setPYUPDAParams(bool afterPyinit);
     void setSLHAFromHeader( const std::vector<std::string> &lines );
     
     void openSLHA( const char* );
     void closeSLHA();
     void openPYUPDA( const char*, bool write_file );
     void closePYUPDA();

         // initialise Pythia on first call from "dummy" instance
         void enter() override;

         CLHEP::HepRandomEngine* randomEngine() const { return fRandomEngine; }
         void setRandomEngine(CLHEP::HepRandomEngine* v) { fRandomEngine = v; }

     private:
        friend double gen::pyr_(int*);

        bool fInitialising;

        CLHEP::HepRandomEngine* fRandomEngine;

        std::vector<std::string> fParamGeneral;
        std::vector<std::string> fParamCSA;
        std::vector<std::string> fParamSLHA; 
        std::vector<std::string> fParamPYUPDA; 
    int  fUnitSLHA;
    int  fUnitPYUPDA;

        static Pythia6Service *fPythia6Owner;
   };

}

#endif