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<pre class="programlisting">//
// server.cpp
// ~~~~~~~~~~
//
// Copyright (c) 2003-2020 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 &lt;ctime&gt;
#include &lt;iostream&gt;
#include &lt;string&gt;
#include &lt;boost/array.hpp&gt;
#include &lt;boost/bind/bind.hpp&gt;
#include &lt;boost/shared_ptr.hpp&gt;
#include &lt;boost/enable_shared_from_this.hpp&gt;
#include &lt;asio.hpp&gt;

using asio::ip::tcp;
using asio::ip::udp;

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

class tcp_connection
  : public boost::enable_shared_from_this&lt;tcp_connection&gt;
{
public:
  typedef boost::shared_ptr&lt;tcp_connection&gt; pointer;

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

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

  void start()
  {
    message_ = make_daytime_string();

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

private:
  tcp_connection(asio::io_context&amp; io_context)
    : socket_(io_context)
  {
  }

  void handle_write()
  {
  }

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

class tcp_server
{
public:
  tcp_server(asio::io_context&amp; 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-&gt;socket(),
        boost::bind(&amp;tcp_server::handle_accept, this, new_connection,
          asio::placeholders::error));
  }

  void handle_accept(tcp_connection::pointer new_connection,
      const asio::error_code&amp; error)
  {
    if (!error)
    {
      new_connection-&gt;start();
    }

    start_accept();
  }

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

class udp_server
{
public:
  udp_server(asio::io_context&amp; io_context)
    : socket_(io_context, udp::endpoint(udp::v4(), 13))
  {
    start_receive();
  }

private:
  void start_receive()
  {
    socket_.async_receive_from(
        asio::buffer(recv_buffer_), remote_endpoint_,
        boost::bind(&amp;udp_server::handle_receive, this,
          asio::placeholders::error));
  }

  void handle_receive(const asio::error_code&amp; error)
  {
    if (!error)
    {
      boost::shared_ptr&lt;std::string&gt; message(
          new std::string(make_daytime_string()));

      socket_.async_send_to(asio::buffer(*message), remote_endpoint_,
          boost::bind(&amp;udp_server::handle_send, this, message));

      start_receive();
    }
  }

  void handle_send(boost::shared_ptr&lt;std::string&gt; /*message*/)
  {
  }

  udp::socket socket_;
  udp::endpoint remote_endpoint_;
  boost::array&lt;char, 1&gt; recv_buffer_;
};

int main()
{
  try
  {
    asio::io_context io_context;
    tcp_server server1(io_context);
    udp_server server2(io_context);
    io_context.run();
  }
  catch (std::exception&amp; e)
  {
    std::cerr &lt;&lt; e.what() &lt;&lt; std::endl;
  }

  return 0;
}
</pre>
<p>
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          TCP/UDP asynchronous server</a>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M.
      Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
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