pub unsafe extern "C" fn igraph_regular_tree(
graph: *mut igraph_t,
h: igraph_int_t,
k: igraph_int_t,
type_: igraph_tree_mode_t,
) -> igraph_error_tpub unsafe extern "C" fn igraph_regular_tree(
graph: *mut igraph_t,
h: igraph_int_t,
k: igraph_int_t,
type_: igraph_tree_mode_t,
) -> igraph_error_t