</span><span class="identifier">expr</span><span class="special">::</span><span class="identifier">attr</span><span class="special">&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">&gt;(</span><span class="string">"Channel"</span><span class="special">)</span> <span class="special">==</span> <span class="string">"net"</span><span class="special">);</span>
<span class="special">}</span>
</pre>
<p>
        </p>
<p>
     