class OutputArchive {
    public:
        void operator()(Entity entity);

        template<typename T>
        void operator()(Entity entity, const T &value) {
            gkDebug() << entity << (void*)&value;
            (*m_packet) << entity << value;
        }

        void setPacket(sf::Packet &packet) { m_packet = &packet; }

    private:
        sf::Packet *m_packet = nullptr;
};

class InputArchive {
    public:
        void operator()(Entity &entity);

        template<typename T>
        void operator()(Entity &, T &value) {
            (*m_packet) >> value;
        }

        void setPacket(sf::Packet &packet) { m_packet = &packet; }

    private:
        sf::Packet *m_packet = nullptr;
};