pub unsafe extern "C" fn igraph_closeness(
graph: *const igraph_t,
res: *mut igraph_vector_t,
reachable_count: *mut igraph_vector_int_t,
all_reachable: *mut igraph_bool_t,
vids: igraph_vs_t,
mode: igraph_neimode_t,
weights: *const igraph_vector_t,
normalized: igraph_bool_t,
) -> igraph_error_t