pub unsafe extern "C" fn igraph_betweenness_subset(
graph: *const igraph_t,
weights: *const igraph_vector_t,
res: *mut igraph_vector_t,
sources: igraph_vs_t,
targets: igraph_vs_t,
vids: igraph_vs_t,
directed: igraph_bool_t,
normalized: igraph_bool_t,
) -> igraph_error_t