BT_ASSERT_PRE(sc->default_clock_class,
"Event's stream class has no default clock class: "
"%![ev-]+e, %![sc-]+S", event, sc);
BT_ASSERT_PRE(sc->default_clock_class,
"Event's stream class has no default clock class: "
"%![ev-]+e, %![sc-]+S", event, sc);