HepMCProduct.h

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#ifndef SimDataFormats_GeneratorProducts_HepMCProduct_h
#define SimDataFormats_GeneratorProducts_HepMCProduct_h

#include <TMatrixD.h>

#include <cstddef>
#include <HepMC/GenEvent.h>
#include <HepMC/SimpleVector.h>

#include "DataFormats/Common/interface/Ref.h"

namespace edm {
    class HepMCProduct {
        public:
        HepMCProduct() :
            evt_(nullptr), isVtxGenApplied_(false),
            isVtxBoostApplied_(false), isPBoostApplied_(false) {}

        explicit HepMCProduct(HepMC::GenEvent *evt);
        virtual ~HepMCProduct();

        void addHepMCData(HepMC::GenEvent *evt);

        void applyVtxGen(HepMC::FourVector const* vtxShift) {
                  applyVtxGen(*vtxShift);
                }
        void applyVtxGen(HepMC::FourVector const& vtxShift);

        void boostToLab(TMatrixD const* lorentz, std::string const& type);

        const HepMC::GenEvent &getHepMCData() const;

        const HepMC::GenEvent *GetEvent() const { return evt_; }

        bool isVtxGenApplied() const { return isVtxGenApplied_; }
        bool isVtxBoostApplied() const { return isVtxBoostApplied_; }
        bool isPBoostApplied() const { return isPBoostApplied_; }

        HepMCProduct(HepMCProduct const &orig);
        HepMCProduct &operator = (HepMCProduct const &other);
        void swap(HepMCProduct &other);

        private:
        HepMC::GenEvent *evt_;

        bool    isVtxGenApplied_ ;
        bool    isVtxBoostApplied_;
        bool    isPBoostApplied_;
    
    };

    // This allows edm::Refs to work with HepMCProduct
    namespace refhelper {
        template<> 
        struct FindTrait<edm::HepMCProduct, HepMC::GenParticle> {
            struct Find : public std::binary_function<edm::HepMCProduct const&, int, HepMC::GenParticle const*> {
                typedef Find self;
                self::result_type operator () (self::first_argument_type iContainer,
                                               self::second_argument_type iBarCode)
                { return iContainer.getHepMCData().barcode_to_particle(iBarCode); }
            };

            typedef Find value;
        };

        template<> 
        struct FindTrait<edm::HepMCProduct, HepMC::GenVertex> {
            struct Find : public std::binary_function<edm::HepMCProduct const&, int, HepMC::GenVertex const*> {
                typedef Find self;

                self::result_type operator () (self::first_argument_type iContainer,
                                               self::second_argument_type iBarCode)
                { return iContainer.getHepMCData().barcode_to_vertex(iBarCode); }
            };

            typedef Find value;
        };
    } // namespace refhelper
} // namespace edm

#endif // SimDataFormats_GeneratorProducts_HepMCProduct_h