msg_host_t h;
xbt_dynar_foreach (hosts, it, h) {
simgrid::s4u::VirtualMachine* vm = dynamic_cast<simgrid::s4u::VirtualMachine*>(h);
msg_host_t h;
xbt_dynar_foreach (hosts, it, h) {
simgrid::s4u::VirtualMachine* vm = dynamic_cast<simgrid::s4u::VirtualMachine*>(h);