ration into a duration used
          for waiting.
        </p>
<pre class="programlisting"><span class="keyword">static</span> <span class="identifier">Clock</span><span class="special">::</span><span class="identifier">duration</span> <span class="identifier">to_wait_duration</span><span class="special">(</span>
    <span class="keyword">const</span> <span class="keyword">typename</span> <span class="identifier">Clock</span><span class="special">::</span><span class="identifier">duration</span> <span clas