    A deadline timer is always in one of two states: "expired" or "not
        expired". If the <a class="link" href="../reference/basic_deadline_timer/wait.html" title="basic_deadline_timer::wait">deadline_timer::wait()</a>
        function is called on an expired timer, it will return immediately.
      </p>
<p>
        Finally we print the obligatory <code class="computeroutput">"Hello, world!"</code> message
        to show when the timer has expired.
      </p>
<p>
        See the <a class="link" href=