C ++模板和继承

Question

Let's say I have a simple Server with a template which accepts a Client as it's template argument:

template<class T>
class Server<T>{
    Server(int port);
}

and a Client is defined something like this:

class Client{
    Client(Server<Client> *server, // <--
           int socket);
};

But I also want say, have the class User inherit from Client ( class User : public Client ), so I could do Server<User> instead of Server<Client> . class User obviously needs to pass Server<Client> as a parameter when constructing Client . However, with the current implementation this seems impossible.

How should I approach this problem?

Answer 1

What about this?

template<class T>
class Server<T>{
    Server(int port);
};

template<class Derived>
class Client {
    Client(Server<Derived> *server, int socket);
    virtual ~Client() {} // Base classes should have this
};

class User : public Client<User> {
};