c++ - Boost 库中的 Io_context 错误

Question

我正在尝试使用 Boost Libraries 构建聊天室。但是当我尝试使用 asio::io_context 时，编译器说:

io_context is not an member of asio.

我构建了 4 次 Boost，我认为问题可能是由于我的安装失败造成的，但事实并非如此。

#include <ctime>
#include <iostream>
#include <string>
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/asio.hpp>

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

std::string make_daytime_string()
{
    using namespace std; // For time_t, time and ctime;
    time_t now = time(0);
    return ctime(&now);
}

class tcp_connection
    : public boost::enable_shared_from_this<tcp_connection>
{
public:
    typedef boost::shared_ptr<tcp_connection> pointer;

    static pointer create(boost::asio::io_context& io_context)
    {
        return pointer(new tcp_connection(io_context));
    }

    tcp::socket& socket()
    {
        return socket_;
    }

    void start()
    {
        message_ = make_daytime_string();

        boost::asio::async_write(socket_, boost::asio::buffer(message_),
            boost::bind(&tcp_connection::handle_write, shared_from_this(),
                boost::asio::placeholders::error,
                boost::asio::placeholders::bytes_transferred));
    }

private:
    tcp_connection(boost::asio::io_context& io_context)
        : socket_(io_context)
    {
    }

    void handle_write(const boost::system::error_code& /*error*/,
        size_t /*bytes_transferred*/)
    {
    }

    tcp::socket socket_;
    std::string message_;
};

class tcp_server
{
public:
    tcp_server(boost::asio::io_context& io_context) //error
        : acceptor_(io_context, tcp::endpoint(tcp::v4(), 13)) //error
    {
        start_accept();
    }

Answer 1

东西changed in Boost 1.66:

release notes显示重命名/更改的接口(interface):

Boost.Asio now provides the interfaces and functionality specified by the "C++ Extensions for Networking" Technical Specification. In addition to access via the usual Boost.Asio header files, this functionality may be accessed through special headers that correspond to the header files defined in the TS. These are listed in the table below: