-simgrid::xbt::signal<void(s4u::Storage&)> Storage::onCreation;
-simgrid::xbt::signal<void(s4u::Storage&)> Storage::onDestruction;
+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;