pub unsafe extern "C" fn igraph_reachability(
graph: *const igraph_t,
membership: *mut igraph_vector_int_t,
csize: *mut igraph_vector_int_t,
no_of_components: *mut igraph_int_t,
reach: *mut igraph_bitset_list_t,
mode: igraph_neimode_t,
) -> igraph_error_t