Question

我正在尝试制作具有协程结果的地图我搜索了一个展示如何获得协程未来的例子之后我需要生成与asio一起使用的任务这是coroutine的代码：

std::map<std::string, boost::shared_ptr<HTTPResponse>> create_tasks(const symbols_enum& symbol, date day)
{
    int start = 0;

    if (is_dst(day))
    {
        start = 1;
    }

    ostringstream oss;
    oss << symbol;
    std::string url_currency{oss.str()};
    std::ostringstream().swap(oss); // swap m with a default constructed stringstream
    std::string url_year{day.year()};

    stringstream ss_month;
    ss_month << setw(2) << setfill('0') << ((day.month().as_number()) - 1);
    string url_month{ ss_month.str() };
    std::stringstream().swap(ss_month); // swap m with a default constructed stringstream

    stringstream ss_day;
    ss_day << setw(2) << setfill('0') << day.day().as_number();
    string url_day{ ss_day.str() };
    std::stringstream().swap(ss_day); // swap m with a default constructed stringstream

    std::string URL{ protocol_host_URL+"/"+"datafeed"+"/"+ url_currency +"/"+ url_year +"/"+ url_month +"/"+ url_day +"/" };

    HTTPClient client;


    std::map<std::string, std::shared_ptr<HTTPRequest>> requests_variables;
    std::map<std::string, boost::shared_ptr<HTTPResponse>> tasks;

    for (int hour = 0;hour < 24;hour++)
    {
        stringstream ss_hour;
        ss_hour << setw(2) << setfill('0') << hour;
        string url_hour{ ss_hour.str() };
        std::stringstream().swap(ss_hour); // swap m with a default constructed stringstream
        URL = URL + url_hour +"h_ticks.bi5";

        std::string request_name = "request_" + std::to_string(hour);
        requests_variables[request_name] =  client.create_request(hour, URL);

        //requests_variables[request_name]->execute();//must be coroutine and i think it should be normal coroutine
        coroutine<boost::shared_ptr<HTTPResponse>>::pull_type response_future_coroutine_pull(requests_variables[request_name]->execute);
        tasks[request_name] = response_future_coroutine_pull.get();         

    }
    //tasks = [asyncio.ensure_future(get]


        return tasks;

    }

这部分代码展示了我将来完成任务所需的方式它基于python为协同程序获取期货的方式我无法理解如何在c ++中这样做我在部分使用asio但是为了使用for循环我想到了将包含在for循环中的协同程序，它的异步函数将在asio服务中运行。
我不知道我的想法是否正确。我特别需要的是一个如何制作协程期货容器的例子......

Answer 1

你在这里不需要boost::coroutine。你想要的是std::aysnc

std::map<std::string, std::future<boost::shared_ptr<HTTPResponse>>> tasks;
for (...) {
    ...
    tasks[request_name] = std::async(&HTTPRequest::execute, client.create_request(hour, URL));
}

如果您想等待回复

std::map<std::string, boost::shared_ptr<HTTPResponse>> responses;
for (auto& pair : tasks) {
    response[pair.first] = pair.second.get();
}

使用提升未来来提升协同程度

1 个答案: