rameter "Filter"
          means the same for both the library-provided "TextFile" sink
          and out custom "StatCollector" sink.
        </p>
<p>
          After defining the factory we only have to register it with the <code class="computeroutput"><a class="link" href="../../boost/log/register_sink_fac_idm38918.html" title="Function template register_sink_factory">register_sink_factory</a></code>
          call. The first argument is the new value of the "Destination"
          parameter in the setti