span></code>,
              defining its number of dimensions (2, 3, ...) (hint: derive it conveniently
              from <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">int_</span><span class="special">&lt;</span><span class="identifier">X</span><span class="special">&gt;</span></code>
              for X Dimensional)
            </li>
<li class="listitem">
          