+void unit_reset_maintenance(Unit *u) {
+ assert(u);
+
+ if (UNIT_VTABLE(u)->reset_maintenance)
+ UNIT_VTABLE(u)->reset_maintenance(u);
+}
+
+Unit *unit_following(Unit *u) {
+ assert(u);
+
+ if (UNIT_VTABLE(u)->following)
+ return UNIT_VTABLE(u)->following(u);
+
+ return NULL;
+}
+