 class="special">&lt;</span><span class="identifier">point_type</span><span class="special">&gt;</span> <span class="identifier">polygon_type</span><span class="special">;</span>

    <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">closure_selector</span> <span class="identifier">clos</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><spa