<span class="identifier">point</span> <span class="special">&gt;(</span><span class="identifier">arg</span><span class="special">);</span>
    <span class="special">}</span>
<span class="special">};</span>

<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_filter_factory</span><span class="special">(</span><sp