+ std::map<std::string, s4u::Host*> hosts_;
+ std::map<std::string, s4u::Link*> links_;
+ std::map<std::string, s4u::Disk*> disks_;
+ std::map<std::string, s4u::Storage*> storages_;
+ std::unordered_map<std::string, routing::NetPoint*> netpoints_;
+ friend s4u::Engine;
+