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#### Source listing for Daytime.3

    //
    // server.cpp
    // ~~~~~~~~~~
    //
    // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
    //
    // Distributed under the Boost Software License, Version 1.0. (See accompanying
    // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
    //

    #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)
        : io_context_(io_context),
          acceptor_(io_context, tcp::endpoint(tcp::v4(), 13))
      {
        start_accept();
      }

    private:
      void start_accept()
      {
        tcp_connection::pointer new_connection =
          tcp_connection::create(io_context_);

        acceptor_.async_accept(new_connection->socket(),
            boost::bind(&tcp_server::handle_accept, this, new_connection,
              boost::asio::placeholders::error));
      }

      void handle_accept(tcp_connection::pointer new_connection,
          const boost::system::error_code& error)
      {
        if (!error)
        {
          new_connection->start();
        }

        start_accept();
      }

      boost::asio::io_context& io_context_;
      tcp::acceptor acceptor_;
    };

    int main()
    {
      try
      {
        boost::asio::io_context io_context;
        tcp_server server(io_context);
        io_context.run();
      }
      catch (std::exception& e)
      {
        std::cerr << e.what() << std::endl;
      }

      return 0;
    }

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