e <code class="computeroutput">wait()</code> or <code class="computeroutput">async_wait()</code> function
        is called on an expired timer, the wait operation will complete immediately.
      </p>
<p>
        Most applications will use one of the <a class="link" href="steady_timer.html" title="steady_timer"><code class="computeroutput">steady_timer</code></a>,
        <a class="link" href="system_timer.html" title="system_timer"><code class="computeroutput">system_timer</code></a>
        or <a class="