[boost] Adapting Polygon to work with point attributes

Boost::Polygon looks like exactly what I need to do some boolean operations on polygons but my polygons have additional attributes per point that I want to carry through the operation. But I can't figure out how to get polygon to create sensible values for the attributes other than X,Y, and I can't find an example that covers this scenario. It seems from the documentation that this is possible however. Can someone point me to an example, to say, adapt a polygon with this Point type? struct Point { int x, y; float r, g, b, a; }; Ideally it would average new r, g, b, a values together to make new points and polygon join points, but it could just copy one of the existing Points' attributes instead. I'm not picky. Cheers!