 <p>In Boost.Polygon operations such as those shown above are free
functions named for what they do, or are overloads of C++ operators
that make it easy to infer from reading the code what to expect.&nbsp;
Operators are contained in the namespace <font face="Courier New">boost::polygon::operators</font>
so that they can be used outside the <font face="Courier New">boost::polygon</font>
namespace without bringing in the entire <font face="Courier New">boost::polygon</font>
namespace.&nbsp; Following the prin