XBT_PUBLIC_DATA(simgrid::xbt::signal<void(s4u::As*)>) asCreatedCallbacks;
XBT_PUBLIC_DATA(simgrid::xbt::signal<void(NetCard*)>) netcardCreatedCallbacks;
XBT_PUBLIC_DATA(simgrid::xbt::signal<void(s4u::As*)>) asCreatedCallbacks;
XBT_PUBLIC_DATA(simgrid::xbt::signal<void(NetCard*)>) netcardCreatedCallbacks;