#[link(name="glue")]
extern "C" {
  pub fn cxx_chrobak_payne(
    nvertices : size_t,
    edge_data : *const [size_t; 2],
    n_edge_data : size_t,
...
}

  let ok = unsafe {
    cxx_chrobak_payne(nvertices,
                      edges.as_ptr(),
                      edges.len(),
                      ...