+static bool
+listeners_are_equal( vlc_event_listener_t * listener1,
+ vlc_event_listener_t * listener2 )
+{
+ return listener1->pf_callback == listener2->pf_callback &&
+ listener1->p_user_data == listener2->p_user_data;
+}
+
+static bool
+group_contains_listener( vlc_event_listeners_group_t * group,
+ vlc_event_listener_t * searched_listener )
+{
+ vlc_event_listener_t * listener;
+ FOREACH_ARRAY( listener, group->listeners )
+ if( listeners_are_equal(searched_listener, listener) )
+ return true;
+ FOREACH_END()
+ return false;
+}
+