extending Gdk::Region

[Christopher Harvey <chris basementcode com>]

I want to extend Gdk::Region. I noticed it didn't have a virtual
destructor. I REALLY need to be able to extend it, otherwise I'll end up
with random functions floating around all over the place.

Basically I want to create a region class that can build itself from
complex input, then be used as a normal region.

Can we make this class extendable? It seems like a nice feature for a
widget library especially.