RandomEngineGlue.h

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#ifndef GeneratorInterface_Herwig7Interface_RandomEngineGlue_h
#define GeneratorInterface_Herwig7Interface_RandomEngineGlue_h

#include <string>

#include <boost/shared_ptr.hpp>

#include <ThePEG/Interface/ClassDocumentation.h>
#include <ThePEG/Interface/InterfacedBase.h>
#include <ThePEG/Interface/Parameter.h>
#include <ThePEG/Utilities/ClassTraits.h>

#include <ThePEG/Repository/StandardRandom.h>

#include "GeneratorInterface/Herwig7Interface/interface/Proxy.h"
#include "CLHEP/Random/RandomEngine.h"

namespace CLHEP {
    class HepRandomEngine;  // forward declaration
}

namespace ThePEG {

class RandomEngineGlue : public RandomGenerator {
    public:
    RandomEngineGlue();
    ~RandomEngineGlue() override;

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

    static void Init();

    class Proxy : public ThePEG::Proxy<Proxy> {
        public:
        RandomEngineGlue *getInstance() const { return instance; }

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

        private:
        friend class RandomEngineGlue;
        friend class ThePEG::Proxy<Proxy>;

        inline Proxy(ProxyID id) : Base(id), instance(nullptr) {}

        RandomEngineGlue *instance;

                // I do not like putting this here, but I could not
                // think of an alternative without modifying the
                // external code in ThePEG. The problem is the
                // function ThePEG::Repository::makeRun both
                // sets the pointer in the proxy and uses the
                // engine. There is no opportunity to set the
                // engine pointer before it is used without passing
                // it in through the proxy.
                CLHEP::HepRandomEngine  *randomEngine;
    };

    protected:
    void fill() override;
    void setSeed(long seed) override;

    IBPtr clone() const override { return new_ptr(*this); }
    IBPtr fullclone() const override { return new_ptr(*this); }

    void doinit() noexcept(false) override;

    private:
    Proxy::ProxyID      proxyID;
    CLHEP::HepRandomEngine  *randomEngine;

    static ClassDescription<RandomEngineGlue> initRandomEngineGlue;
};

template<>
struct BaseClassTrait<RandomEngineGlue, 1> : public ClassTraitsType {
    typedef RandomGenerator NthBase;
};

template<>
struct ClassTraits<RandomEngineGlue> :
            public ClassTraitsBase<RandomEngineGlue> {
    static string className() { return "ThePEG::RandomEngineGlue"; }
    static string library() { return "libGeneratorInterfaceHerwig7Interface.so"; }
};

} // namespace ThePEG

#endif // GeneratorInterface_Herwig7Interface_RandomEngineGlue_h