 can provide iterators
over holes that are also polygon_45.&nbsp; A mutable
polygon_45_with_holes must also be able to set its geometry based on an
interator range over polygon_45 holes.&nbsp; There is no convention of
winding of holes enforced within the library. </font></p>
      <p> <font face="Times New Roman">Below is shown the default
polygon with holes traits.&nbsp; Specialization of these traits is
required for types that don't conform to the default behavior.</font></p>
      <p><font face="Courier