传递boost :: asio :: ip :: tcp :: socket

Question

好的,这是我目前的代码片段:

namespace bai = boost::asio::ip;
bai::tcp::socket tcp_connect(std::string hostname, std::string port) {
    try {
        boost::asio::io_service io_service;
        bai::tcp::resolver resolver(io_service);

        // we now try to get a list of endpoints to the server 
        bai::tcp::resolver::query query(hostname, port);
        bai::tcp::resolver::iterator endpoint_iterator = resolver.resolve(query);
        bai::tcp::resolver::iterator end;

        // looking for a successful endpoint connection
        bai::tcp::socket socket(io_service);
        boost::system::error_code error = boost::asio::error::host_not_found;
        while (error && endpoint_iterator != end) {
            socket.close();
            socket.connect(*endpoint_iterator++ , error);
        }

        if (error) throw boost::system::system_error(error);

        return socket;
    } catch (std::exception &ex) {
        std::cout << "Exception: " << ex.what() << "\n";
    }
}

这应该返回一个boost::asio::ip::tcp::socket连接hostname上port.但是我遇到了一些难以理解的boost::noncopyable错误.但我的问题是,我该如何绕过这些插座呢？这有什么问题？

Answer 1

socket无法复制.请boost::shared_ptr<bai::tcp::socket>改用.如果您可以复制套接字,那么如果最终有两个socket实例代表相同的底层操作系统套接字,则会出现各种有趣的问题- 因此,不允许复制(因此按值返回,按值传递).