Steven Watanabe wrote:

FWIW, non-virtual destructors are the norm in Boost. I strongly dislike the idea of having a policy enabling virtual destructors.

I understand this in many cases. OTOH, the geometry types seem to me to be begging for usage the OO way. A small note in the documentation seems to be better than hours of debugging and cannot hurt anyway. The policy was simply a suggestion as it proved a useful solution in my own experience.