- simgrid::s4u::Activity::on_completion_cb([](simgrid::s4u::Activity& activity) {
- const auto* exec = dynamic_cast<simgrid::s4u::Exec*>(&activity);
+ simgrid::s4u::Activity::on_completion_cb([](simgrid::s4u::Activity const& activity) {
+ const auto* exec = dynamic_cast<simgrid::s4u::Exec const*>(&activity);