+size_t HostImpl::get_actor_count()
+{
+ return actor_list_.size();
+}
+
+std::vector<s4u::Disk*> HostImpl::get_disks()
+{
+ std::vector<s4u::Disk*> disks;
+ for (auto const& d : disks_)
+ disks.push_back(&d->piface_);
+ return disks;
+}
+
+void HostImpl::add_disk(s4u::Disk* disk)
+{
+ disks_.push_back(disk->get_impl());
+}
+
+void HostImpl::remove_disk(const std::string& disk_name)