/data/refman/pasoursint/CMSSW_4_1_8_patch13/src/GeneratorInterface/ThePEGInterface/interface/Proxy.h

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#ifndef GeneratorInterface_ThePEGInterface_Proxy_h
#define GeneratorInterface_ThePEGInterface_Proxy_h

#include <boost/shared_ptr.hpp>

namespace ThePEG {

// forward declarations
class LHEEvent;
class LHERunInfo;

template<class T> class Proxy;

class ProxyBase {
    public:
        typedef unsigned long ProxyID;

        virtual ~ProxyBase();

        ProxyID getID() const { return id; }

    private:
        typedef ProxyBase *(*ctor_t)(ProxyID id);

        template<class T> friend class Proxy;

        ProxyBase(ProxyID id);

        static boost::shared_ptr<ProxyBase> create(ctor_t ctor);
        static boost::shared_ptr<ProxyBase> find(ProxyID id);

        // not allowed and not implemented
        ProxyBase(const ProxyBase &orig);
        ProxyBase &operator = (const ProxyBase &orig);

        const ProxyID   id;
};

template<class T>
class Proxy : public ProxyBase {
    public:
        typedef Proxy Base;

        static inline boost::shared_ptr<T> create()
        { return boost::static_pointer_cast<T>(ProxyBase::create(&Proxy::ctor)); }
        static inline boost::shared_ptr<T> find(ProxyID id)
        { return boost::dynamic_pointer_cast<T>(ProxyBase::find(id)); }

    protected:
        inline Proxy(ProxyID id) : ProxyBase(id) {}

    private:
        static ProxyBase *ctor(ProxyID id) { return new T(id); }
};

} // namespace ThePEG

#endif // GeneratorProxy_ThePEGInterface_Proxy_h