bool in_local_mode(const cGH *restrict cctkGH) {
  if (cctkGH->cctk_gsh[0] == undefined)
    return false;
}
bool in_level_mode(const cGH *restrict cctkGH) {
  if (in_local_mode(cctkGH))
    return false;
  if (cctkGH->cctk_gsh[0] == undefined)
    return false;
  return true;
}
bool in_global_mode(const cGH *restrict cctkGH) {
  if(in_local_mode(cctkGH))
    return false;
  if(in_level_mode(cctkGH))
    return false;
  if(cctkGH->cctk_nghostzones[0] == undefined)
    return false;
  return true;
}

  assert(in_global_mode(cctkGH));