es_mutable_traits {<br />
&nbsp;&nbsp;&nbsp;&nbsp; template &lt;typename iT&gt;<br />
&nbsp;&nbsp;&nbsp;&nbsp; static inline T&amp; set_holes(T&amp; t, iT
inputBegin, iT inputEnd) {<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
t.set_holes(inputBegin, inputEnd);<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return t;<br />
&nbsp;&nbsp;&nbsp;&nbsp; }<br />
};</font></p>
      <p>An object that is a model of <font face="Courier New">
polygon_45_with_holes_concept</font> can be vi