Hey Wim, Thanks for all the useful info on the status of things!
> Overriding of virtual functions can only be done with a helper class > deriving from the callback interface on the C++ side. There's no other > (portable) way. Yeah, I kinda figured this would be required regardless, and that bit isn't really that onerous.. it was mainly the extra cffi -> Python -> C++ -> Python round-trip I was hoping to be able to avoid somehow.. > For global functions, I've found helper with void* + cffi (the way you've > described in your mail) enough. Yes, that isn't satisfactory, but last > year the priority has been Cling. > Entirely understandable (and the Cling stuff sounds like a better solution all round, so I agree with that priority). At least now I know I'm on the right track for an interim solution, and something better is actually on the way. :) As such, it all took about a year longer, but since end of November last > year, we now have a working bindings generator for Cling, but only on > CPython. I've only just started (this week) with the groundwork of getting > a > back-end for cppyy into shape. Out of curiosity, how much work do you expect the cppyy part of things to be? (I'd offer to help, but I suspect it's all way over my head..) This does also beg another question that's sorta been at the back of my mind for a bit: Since all of the underlying stuff gets done in CPython first, Is there any chance that at some point we might see a version of cppyy for CPython as well (with similar usage and dependencies)? It's not something I really need for this particular project, but it would be really cool if the Bullet library bindings I'm making (and potentially other C++ libraries) could eventually be used from either PyPy or CPython interchangeably.. I never made a standalone libcppyy_backend library for CINT, as I don't > expect there to be any use (physicists in HEP use by and large only > releases > provided by their experiments' software group; and CINT should be on its > way > out now that we have Cling largely working). That's ok, by the sound of things the Cling-based stuff is moving along well and I can probably wait around a bit for that instead. :) Anyway, thanks for the diligent work! I'm really looking forward to seeing the cling-cppyy (and will be happy to test, etc) when it's ready. --Alex
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