tree - no effect and 0 returned instead
          of assertion failure
        </li>
<li class="listitem">
          Fix segfault in centroid for multi geometries containing empty single geometries
          (thanks to Jiri Drbalek)
        </li>
<li class="listitem">
          Fix liang_barsky strategy for integral coordinates (thanks to Dane Springmeyer)
        </li>
</ul></div>
<h4>
<a name="geometry.release_notes.h7"></a>
      <span class="phrase"><a name="geometry.release_notes.boost_1_59"></a></span