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<pre class="programlisting">//
// timer.cpp
// ~~~~~~~~~
//
// Copyright (c) 2003-2017 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;iostream&gt;
#include &lt;boost/asio.hpp&gt;
#include &lt;boost/bind.hpp&gt;
#include &lt;boost/date_time/posix_time/posix_time.hpp&gt;

void print(const boost::system::error_code&amp; /*e*/,
    boost::asio::deadline_timer* t, int* count)
{
  if (*count &lt; 5)
  {
    std::cout &lt;&lt; *count &lt;&lt; std::endl;
    ++(*count);

    t-&gt;expires_at(t-&gt;expires_at() + boost::posix_time::seconds(1));
    t-&gt;async_wait(boost::bind(print,
          boost::asio::placeholders::error, t, count));
  }
}

int main()
{
  boost::asio::io_context io;

  int count = 0;
  boost::asio::deadline_timer t(io, boost::posix_time::seconds(1));
  t.async_wait(boost::bind(print,
        boost::asio::placeholders::error, &amp;t, &amp;count));

  io.run();

  std::cout &lt;&lt; "Final count is " &lt;&lt; count &lt;&lt; std::endl;

  return 0;
}
</pre>
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