How do you pass kwargs to a boost-python wrapped function?

Question

I have a python function with this signature:

def post_message(self, message, *args, **kwargs):

I would like to call the function from c++

Answer 1

After some investigation, it turns out that the object function call operator is overridden for two arguments of type args_proxy and kwds_proxy. So you have to use this specific call style of two arguments.

args_proxy and kwds_proxy are generated by the * overloads. This is really nice.

Additionally, the first argument must be a tuple type so that the python interpreter correctly handles the *args argument.

The resulting example works:

boost::python::list arguments;
arguments.append("aMessage");
arguments.append("1");

boost::python::dict options;
options["source"] = "cpp";

boost::python::object python_func = get_python_func_of_wrapped_object()
python_func(*boost::python::tuple(arguments), **options)

Hope this helps...