Handle none-type objects during casting#5
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Pybind11 allows to pass
NoneTypepython objects to wrapped functions which will end up being passed asnullptrs to the underlying c++ function. See https://pybind11.readthedocs.io/en/stable/advanced/functions.html#allow-prohibiting-none-arguments.For this to also work with swigbound types, the conversion of
NoneTypeobjects must be handled specially. The code in this PR was inspired by pybind11's internal handling ofNoneTypes in itstype_caster: https://github.com/pybind/pybind11/blob/master/include/pybind11/cast.h#L376-L422