Protected vars not getting inherited?

I have Class A extending Class B and implementing Interface C. B accesses a protected var x from A. But the compiler is telling me that x is not declared in this scope. The code looks like

Sender.h

Code:

---

#include "properties.h"
class Sender
{
    public:
        Sender(Properties p);
    protected
        int  sock;
        int  getSocket();
};

---

MyListener.h

Code:

---

#include "sender.h"
class MyListener : public Sender, public Listener
{
    public:
        void on_ready();
        int getSocket();
};

---

MyListener.cpp

Code:

---

#include "mylistener.h"
int MyListener::getSocket()
{
    return sock;
}

---

Compiling MyListener.cpp causes a "'sock' was not declared in this scope" error.

Except for a missing colon after protected, it looks okay to me. (Though you might want to provide your base classes with virtual destructors, and virtual inheritance might be appropriate.)

Well, I found the problem was one of those "see what you want to see" errors. I actually didn't have
int MyListener::getSocket()
but
int getSocket()