s4u::Host piface_;
std::map<std::string, DiskImpl*, std::less<>> disks_;
std::map<std::string, VirtualMachineImpl*, std::less<>> vms_;
s4u::Host piface_;
std::map<std::string, DiskImpl*, std::less<>> disks_;
std::map<std::string, VirtualMachineImpl*, std::less<>> vms_;