(de)serialization.cpp

class SerializabelHello {};
class NonSerializableHello {};

class HelloBehavior: public Behavior {
  virtual void receive(SerializableHello const& msg) = 0;
  virtual void receive(NonSerializableHello const& msg) = 0;
};

class HelloActor: public Actor, public HelloBehavior { ... };

void main() {
  auto system = ActorSystem{};
  auto ref = make_actor<HelloActor>(system, "Greetings");
  
  ref.send(SerializableHello{});    // compiles!
  ref.send(NonSerializableHello{}); // doesn't compile!
}