Hey Ian - I hope I gave Cython a fair comment, but I have to add the disclaimer that your capability to understand/implement those solutions/workarounds in that project is greatly enhanced from your knowing the innards of Cython from being core developer on the Cython project. This doesn't detract from DyDN's accomplishments (if nothing it means Cython users should look there for how to use C++ with Cython and the workarounds used + shortcomings) but I would not expect not everyone would want to jump through those hoops to get things working without a firm understanding of Cython's edges, and all this potential for special/hack adaption code is still something to keep in mind when comparing to something more straight forward and easier to understand coming from a more pure C/C++ side, where things are a bit more dangerous and fairly more verbose but make play with the language and environment first-class (like Boost.Python/pybind).  Since this thread is a survey over state and options it's my intent just to make sure readers have something bare in mind for current pros/cons of the approaches.