[SciPy-Dev] Calling LowLevelCallable from Cython

[Stefan van der Walt]

Hi all,

I am looking into how to call a user-provided LowLevelCallable from
Cython.  In SciPy, I could only find examples of how to do that from C
(e.g. `scipy.integrate.quad`).  Wherever it is used, some processing is
done to see whether the LowLevelCallable provides a Python function, a C
function, what the signature is, etc. before calling.

Would it be convenient to have a set of Cython utilities that makes this
process easier?  Or is there perhaps a trick in Cython that makes it
trivial?

I'm going to work on this more tomorrow, but wanted to check first
whether anyone here has attempted something similar?

Thanks!
Stéfan