-surf_callback(void, simgrid::surf::Link*) networkLinkCreatedCallbacks;
-surf_callback(void, simgrid::surf::Link*) networkLinkDestructedCallbacks;
-surf_callback(void, simgrid::surf::Link*, e_surf_resource_state_t, e_surf_resource_state_t) networkLinkStateChangedCallbacks;
-surf_callback(void, simgrid::surf::NetworkAction*, e_surf_action_state_t, e_surf_action_state_t) networkActionStateChangedCallbacks;
-surf_callback(void, simgrid::surf::NetworkAction*, simgrid::surf::RoutingEdge *src, simgrid::surf::RoutingEdge *dst, double size, double rate) networkCommunicateCallbacks;
+simgrid::surf::signal<void(simgrid::surf::Link*)> networkLinkCreatedCallbacks;
+simgrid::surf::signal<void(simgrid::surf::Link*)> networkLinkDestructedCallbacks;
+simgrid::surf::signal<void(simgrid::surf::Link*, e_surf_resource_state_t, e_surf_resource_state_t)> networkLinkStateChangedCallbacks;
+simgrid::surf::signal<void(simgrid::surf::NetworkAction*, e_surf_action_state_t, e_surf_action_state_t)> networkActionStateChangedCallbacks;
+simgrid::surf::signal<void(simgrid::surf::NetworkAction*, simgrid::surf::RoutingEdge *src, simgrid::surf::RoutingEdge *dst, double size, double rate)> networkCommunicateCallbacks;