-simgrid::xbt::signal<void(s4u::Storage&)> Storage::on_creation;
-simgrid::xbt::signal<void(s4u::Storage&)> Storage::on_destruction;
-simgrid::xbt::signal<void(s4u::Storage&)> Storage::on_state_change;
+xbt::signal<void(Storage&)> Storage::on_creation;
+xbt::signal<void(Storage&)> Storage::on_destruction;
+xbt::signal<void(Storage&)> Storage::on_state_change;