pub unsafe extern "C" fn igraph_layout_sugiyama(
graph: *const igraph_t,
res: *mut igraph_matrix_t,
routing: *mut igraph_matrix_list_t,
layers: *const igraph_vector_int_t,
hgap: igraph_real_t,
vgap: igraph_real_t,
maxiter: igraph_int_t,
weights: *const igraph_vector_t,
) -> igraph_error_t