- printf("%%%%we are getting the subscription callback for func id %d\n", func_id);
- SubscriptionCallback cb = subscription_callbacks[func_id];
+ fprintf(stderr, "%%%%we are getting the subscription callback for func id %d\n", func_id);
+ SubscriptionCallback cb;
+
+ try {
+ cb = subscription_callbacks.at(func_id);
+ } catch(const std::out_of_range& e) {
+ throw std::out_of_range("Function ID is not registered");
+ }