lling out the filter
          factory and register a simple factory provided by the library:
        </p>
<p>
</p>
<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">init_factories</span><span class="special">()</span>
<span class="special">{</span>
    <span class="identifier">logging</span><span class="special">::</span><span class="identifier">register_simple_filter_factory</span><span class="special">&lt;</span> <span class="identifier">point</span><span class="speci