the c++ api has never been upgraded since years. There is not even a Linux port available. Also, it is only available as dynamic lib. A static lib that can be included in c projects is missing.
The c++ Api can help to encourage more developers to write code for Notes and Domino, because it is easier to understand than the core cApi.
the c++ Api is a wrapper around the cApi. Put it on GitHub / OpenNtf so that the comunity can maintain it.