Method on_session_close

cpp/examples/broker.cpp:384–393

    }

    void on_session_close(proton::session &session) override {
        // Unsubscribe all senders that belong to session.
        for (proton::sender_iterator i = session.senders().begin(); i != session.senders().end(); ++i) {
            Sender* s = Sender::get(*i);
            if (s && s->queue_) {
                auto q = s->queue_;
                s->queue_->add([=]{q->unsubscribe(s);});
            }
        }
    }

    void on_error(const proton::error_condition& e) override {
        std::cout << "protocol error: " << e.what() << std::endl;