Proxy.h

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#ifndef GeneratorInterface_Herwig7Interface_Proxy_h
#define GeneratorInterface_Herwig7Interface_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) = delete;
    ProxyBase &operator = (const ProxyBase &orig) = delete;

    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_Herwig7Interface_Proxy_h