void visit_start_alternate(Visitor *v, const char *name, GenericAlternate **obj, size_t size, bool promote_int, Error **errp) { Error *err = NULL; assert(obj && size >= sizeof(GenericAlternate)); assert(v->type != VISITOR_OUTPUT || *obj); if (v->start_alternate) { v->start_alternate(v, name, obj, size, promote_int, &err); } if (v->type == VISITOR_INPUT) { assert(v->start_alternate && !err != !*obj); } error_propagate(errp, err); }