Question

I have read the other threads regarding this same problem but I still don’t know why I am getting the following error: undefinded reference to and lists every method in the outer class.

class ClientConnection
{

public:

   class Connector

   {

   public:

         Connector(ClientConnection&);
         ~Connector();

        void Connect(unsigned int usleep);
        void Stop();
        bool isConnected();

    private:

        void attempt();

        ClientConnection& m_client;
        unsigned int m_usleep;
        bool m_stopRequest;
        bool m_isBusy;
        boost::shared_ptr<boost::thread> m_thread;

  };

  Connector* Connector();

  bool connect();
  bool isConnected();

private:

 friend class Connector;
};

I have a reference to the outer class. The Connector method news up a Connector object and passes it a references to itself. But everywhere in code where I get an undefined reference to ClientConnection::connect and undefined reference to ClientConnection::isConnected.

I am completely stuck.

ALSO – when I use Connector() to new up an object, ClientConnection::Connector* connector = client.Connector(); where client is an solid object of ClientConnection, I get invalid use of non-static member function ‘ClientConnection::Connector* ClientConnection::Connector()’

Answer 1

A few things to consider:

1. Connector* Connector(); – what are you trying to do here? If you’re trying to declare a pointer to a connector, do Connector* ptr_connector; or something. You’re basically invoking a constructor, declaring a pointer, and giving neither a variable name – it’s crazy!

2. Did you actually implement the functions were seeing in the nested class, if not that’s where your problem is! Also, did you implement them correctly for a nested class? The syntax is a little different if you’re not implementing them inline in the class.

3. ClientConnection::Connector* connector = client.Connector(); – This doesn’t work either. you declared an explicit constructor in your class requiring a client connection object. But here, you’re trying to create a connector without passing any client object. You don’t have a constructor for Connector taking no parameters.