basic_request_handler.cpp

template <
    class Tag
    >
struct basic_request_handler_interface {
    typedef basic_request<Tag> request_type;
    typedef basic_response<Tag> response_type;
    
    virtual void operator () (const request_type &request,
                              response_type &response) = 0;
};


template <
    class Handler,
    class Tag
    >
struct basic_request_handler_impl : basic_request_handler_interface<Tag> {

    Handler handler;
    
    basic_request_handler_impl(Handler handler)
        : handler(handler) {
        
    }

    virtual void operator () (const request_type &request,
                              response_type &response) {
        handler(request, response);
    }
};


template <
    class Tag
    >
struct basic_request_handler {

    typedef basic_request<Tag> request_type;
    typedef basic_response<Tag> response_type;
    
    boost::shared_ptr<basic_request_handler_interface<Tag> > handler;

    template <
        class Handler
        >
    basic_request_handler(Handler handler)
        : handler(new basic_request_handler_impl(handler)) {
        
    }

    virtual void operator () (const request_type &request,
                              response_type &response) {
        (*handler)(request, response);
    }
};