}
enum class mode_t { unknown, local, level, global, meta };
mode_t current_mode(const cGH *restrict cctkGH) {
  if (cctkGH->cctk_lsh[0] != undefined)
    return mode_t::local;
  else if(cctkGH->cctk_gsh[0] != undefined)
    return mode_t::level;
  else if(cctkGH->cctk_nghostzones[0] != undefined)
    return mode_t::global;
  else
    return mode_t::meta;

bool in_local_mode(const cGH *restrict cctkGH) {
    return current_mode(cctkGH) == mode_t::local;
}
bool in_level_mode(const cGH *restrict cctkGH) {
    return current_mode(cctkGH) == mode_t::level;
}
bool in_global_mode(const cGH *restrict cctkGH) {
    return current_mode(cctkGH) == mode_t::global;
}
bool in_meta_mode(const cGH *restrict cctkGH) {
    return current_mode(cctkGH) == mode_t::meta;
}

  // init into meta mode
  cctkGH->cctk_nghostzones[0] = undefined;
  cctkGH->cctk_lsh[0] = undefined;
  cctkGH->cctk_gsh[0] = undefined;
  assert(in_meta_mode(cctkGH));

  assert(in_meta_mode(cctkGH));

  assert(in_global_mode(cctkGH));

  assert(in_global_mode(cctkGH));

  assert(in_level_mode(cctkGH));

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

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_level_mode(cctkGH));

  assert(in_local_mode(cctkGH));

enum class mode_t { unknown, local, level, global, meta };

  //assert(!in_local_mode(cctkGH));
  //assert(!in_level_mode(cctkGH));
  //assert(in_global_mode(cctkGH));

  assert(in_global_mode(cctkGH));