为什么boost在这种情况下不创建线程(C2248)，以及如何创建它

Why boost does not create a thread in such case (C2248) and how to create it?

本文关键字：创建 何创建 C2248 boost 这种情况下 线程 为什么      更新时间：2023-10-16

所以我有这样的代码:

using namespace boost::asio::ip;
using namespace std;
void request_response_loop(boost::asio::ip::tcp::socket& socket)
{
    http_request request(socket);
    http_response response;
    response.body = "<head></head><body><h1>It Rocks!</h1></body>";
    response.send(socket);
    socket.close();
    cout << "connection resolved." << endl;
}

void acceptor_loop(){
    boost::asio::io_service io_service;
    int m_nPort = 12345;
    tcp::acceptor acceptor(io_service, tcp::endpoint(tcp::v4(), m_nPort));
    cout << "Waiting for connection..." << endl;
    while(true)
    {
        try
        {
            tcp::socket socket(io_service);
            acceptor.accept(socket);
            cout << "connection accepted." << endl;
            boost::thread workerThread2(request_response_loop, socket); // here it does not compile because of C2248
        }
        catch(exception &e)
        {
            cerr << e.what() << endl; //"The parameter is incorrect" exception
        }
    }
}
int main()
{ 
    boost::thread workerThread(acceptor_loop);
    cin.get();
}

显示错误:

Error   1   error C2248: boost::noncopyable_::noncopyable::noncopyable: "boost::noncopyable_::noncopyable"  boostasiobasic_io_object.hpp  93

如何使它有可能运行我的request_response_loop函数在另一个线程，我使用套接字接受?

进一步解释Ben的回答，boost::shared_ptr<>是这里常用的机制:

void request_response_loop(boost::shared_ptr<tcp::socket> socket)
{
    http_request request(*socket);
    http_response response;
    response.body = "<head></head><body><h1>It Rocks!</h1></body>";
    response.send(*socket);
    socket->close();
    cout << "connection resolved." << endl;
}
void acceptor_loop()
{
    boost::asio::io_service io_service;
    int m_nPort = 12345;
    tcp::acceptor acceptor(io_service, tcp::endpoint(tcp::v4(), m_nPort));
    cout << "Waiting for connection..." << endl;
    while(true)
    {
        try
        {
            boost::shared_ptr<tcp::socket> socket =
                boost::make_shared<tcp::socket>(boost::ref(io_service));
            acceptor.accept(*socket);
            cout << "connection accepted." << endl;
            boost::thread workerThread2(request_response_loop, socket);
        }
        catch(exception &e)
        {
            cerr << e.what() << endl;
        }
    }
}

下次显示完整的错误信息

你的问题是你的线程过程需要一个对套接字的引用，但是套接字是一个局部变量。acceptor_loop函数不会等待，因此一旦套接字超出作用域，它就会销毁套接字。

对于线程间传递的变量，你需要使用动态或静态生命周期，而不是自动的。

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