#endif
/*! Signal fired each time that an execution actually starts (no veto) */
static void on_start_cb(const std::function<void(Exec const&)>& cb) { on_start.connect(cb); }
#endif
/*! Signal fired each time that an execution actually starts (no veto) */
static void on_start_cb(const std::function<void(Exec const&)>& cb) { on_start.connect(cb); }