</p>
<p>
          The usage is similar to the <code class="computeroutput"><a class="link" href="../../boost/log/sinks/unlocked_sink.html" title="Class template unlocked_sink">unlocked_sink</a></code>.
        </p>
<p>
</p>
<pre class="programlisting"><span class="keyword">enum</span> <span class="identifier">severity_level</span>
<span class="special">{</span>
    <span class="identifier">normal</span><span class="special">,</span>
    <span class="identifier">warning</span><span class="special">,</span>
