pub unsafe extern "C" fn igraph_assortativity(
graph: *const igraph_t,
weights: *const igraph_vector_t,
values: *const igraph_vector_t,
values_in: *const igraph_vector_t,
res: *mut igraph_real_t,
directed: igraph_bool_t,
normalized: igraph_bool_t,
) -> igraph_error_t