优雅地取消boost::asio::async_read

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

void handle_read(const boost::system::error_code& error, std::size_t bytes_transferred)
{
    if (!error)
    {
        // 处理读取的数据
        std::cout << "Read " << bytes_transferred << " bytes" << std::endl;
    }
    else if (error == boost::asio::error::operation_aborted)
    {
        // 读取操作被取消
        std::cout << "Read operation cancelled" << std::endl;
    }
    else
    {
        // 发生错误
        std::cout << "Read error: " << error.message() << std::endl;
    }
}

int main()
{
    boost::asio::io_context io_context;
    boost::asio::ip::tcp::socket socket(io_context);
    boost::asio::streambuf buffer;

    // 连接到远程服务器
    boost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::address::from_string("127.0.0.1"), 1234);
    socket.connect(endpoint);

    // 异步读取数据
    boost::asio::async_read(socket, buffer, boost::asio::transfer_all(),
        boost::bind(handle_read, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));

    // 取消读取操作
    socket.cancel();

    // 运行IO上下文，处理异步操作
    io_context.run();

    return 0;
}