}
if (current_routing == nullptr) { /* it is the first one */
- xbt_assert(simgrid::s4u::Engine::get_instance()->pimpl->netzone_root_ == nullptr,
- "All defined components must belong to a networking zone.");
- simgrid::s4u::Engine::get_instance()->pimpl->netzone_root_ = new_zone;
-
+ simgrid::s4u::Engine::get_instance()->set_netzone_root(new_zone);
} else {
/* set the father behavior */
if (current_routing->hierarchy_ == simgrid::kernel::routing::NetZoneImpl::RoutingMode::unset)