Access numSubscribers from ws

[mmoelle1]

I have developed an application based on the EchoServerThreaded.cpp example. Is it possible to access the numSubscribers() function from the TemplatedApp class from them .message = ... lambda expression, e.g.,

uWS::App().ws<PerSocketData>("/*", {
                /* Settings */
                .compression = uWS::SHARED_COMPRESSOR,
                .maxPayloadLength = 16 * 1024,
                .idleTimeout = 10,
                .maxBackpressure = 1 * 1024 * 1024,
                /* Handlers */
                .upgrade = nullptr,
                .open = [](auto */*ws*/) {

                },
                .message = [](auto *ws, std::string_view message, uWS::OpCode opCode) {
                    ws->send(message, opCode);

                    ws // ACCESS numSubscribers() HERE

                },
                .drain = [](auto */*ws*/) {
                    /* Check getBufferedAmount here */
                },
                .ping = [](auto */*ws*/, std::string_view) {

                },
                .pong = [](auto */*ws*/, std::string_view) {

                },
                .close = [](auto */*ws*/, int /*code*/, std::string_view /*message*/) {

                }
            }).listen(9001, [](auto *listen_socket) {
                if (listen_socket) {
                    std::cout << "Thread " << std::this_thread::get_id() << " listening on port " << 9001 << std::endl;
                } else {
                    std::cout << "Thread " << std::this_thread::get_id() << " failed to listen on port 9001" << std::endl;
                }
            }).run();