c++
std::promise<json> promise_answ;
                std::future<json> future_answ = promise_answ.get_future();
                _manager.addJob(db_name, it->second, in["cmd"], &promise_answ);
                // future_answ.wait();
                while (future_answ.wait_for(std::chrono::seconds(1)) != std::future_status::ready) {
                    std::cout << "... still not ready\n";
                }
                json answer;
                answer = future_answ.get();
                std::cout << answer << std::endl;