HepMCInterface.hh

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#pragma once
 
#include <sys/types.h>
#include <vector>
 
namespace HepMC{
  class GenCrossSection;
  class GenEvent;
}
 
namespace HEJ{
  class Event;
  class EventParameters;
 
  class HepMCInterface{
  public:
    HepMCInterface();
    HepMC::GenEvent operator()(Event const & event, ssize_t weight_index = -1);
    HepMC::GenEvent init_kinematics(Event const & event);
    void set_central(HepMC::GenEvent & out_ev, Event const & event,
      ssize_t weight_index = -1);
    void add_variation(HepMC::GenEvent & out_ev,
      std::vector<EventParameters> const & variations);
  private:
    size_t event_count_;
    double tot_weight_;
    double tot_weight2_;
    HepMC::GenCrossSection cross_section() const;
 
  };
}