pub unsafe extern "C" fn igraph_empty(
graph: *mut igraph_t,
n: igraph_int_t,
directed: igraph_bool_t,
) -> igraph_error_tpub unsafe extern "C" fn igraph_empty(
graph: *mut igraph_t,
n: igraph_int_t,
directed: igraph_bool_t,
) -> igraph_error_t