="special">));</span>
    <span class="identifier">core</span><span class="special">-&gt;</span><span class="identifier">add_sink</span><span class="special">(</span><span class="identifier">sink</span><span class="special">);</span>

    <span class="comment">// You can manage filtering and formatting through the sink interface</span>
    <span class="identifier">sink</span><span class="special">-&gt;</span><span class="identifier">set_filter</span><span class="special">(</span><span class="identifier">exp