Method on_container_start

cpp/examples/tracing_client.cpp:70–76

    client(const std::string &u, const std::vector<std::string>& r) : url(u), requests(r) {}

    void on_container_start(proton::container &c) override {
        sender = c.open_sender(url);
        // Create a receiver requesting a dynamically created queue
        // for the message source.
        receiver_options opts = receiver_options().source(source_options().dynamic(true));
        receiver = sender.connection().open_receiver("", opts);
    }

    void send_request() {
        proton::message req;