"keyword">false</span><span class="special">;</span>
<span class="special">}</span>

<span class="comment">// Custom point filter factory</span>
<span class="keyword">class</span> <span class="identifier">point_filter_factory</span> <span class="special">:</span>
    <span class="keyword">public</span> <span class="identifier">logging</span><span class="special">::</span><span class="identifier">filter_factory</span><span class="special">&lt;</span> <span class="keyword">char</span> <span class="special">&g