std::unordered_map<std::string, std::string>* properties, ActorImpl* parent_actor);
static ActorImplPtr attach(std::string name, void* data, s4u::Host* host,
std::unordered_map<std::string, std::string>* properties);
std::unordered_map<std::string, std::string>* properties, ActorImpl* parent_actor);
static ActorImplPtr attach(std::string name, void* data, s4u::Host* host,
std::unordered_map<std::string, std::string>* properties);