怎样在C++中处理网络超时？

#include <iostream>
#include <boost/asio.hpp>
#include <boost/asio/steady_timer.hpp>

using boost::asio::ip::tcp;

void handle_timeout(const boost::system::error_code& error) {
    if (error == boost::asio::error::operation_aborted) {
        std::cout << "Timeout occurred!" << std::endl;
    } else {
        std::cout << "Timeout handler called, but no timeout occurred." << std::endl;
    }
}

int main() {
    try {
        boost::asio::io_context io_context;
        tcp::resolver resolver(io_context);
        tcp::socket socket(io_context);

        // 解析服务器地址和端口
        auto endpoints = resolver.resolve("example.com", "http");

        // 设置超时时间为5秒
        boost::asio::steady_timer timer(io_context);
        timer.expires_after(std::chrono::seconds(5));
        timer.async_wait([](const boost::system::error_code& error) {
            if (error != boost::asio::error::operation_aborted) {
                std::cout << "Timeout occurred!" << std::endl;
            }
        });

        // 连接到服务器
        boost::asio::async_connect(socket, endpoints,
            [&](const boost::system::error_code& error, const tcp::endpoint& endpoint) {
                if (!error) {
                    std::cout << "Connected to " << endpoint << std::endl;
                    timer.cancel(); // 连接成功，取消定时器
                } else {
                    std::cout << "Connection failed: " << error.message() << std::endl;
                }
            });

        io_context.run();
    } catch (std::exception& e) {
        std::cerr << "Exception: " << e.what() << std::endl;
    }

    return 0;
}