How can I pass a class member function as a callback?

Question

I\'m using an API that requires me to pass a function pointer as a callback. I\'m trying to use this API from my class but I\'m getting compilation errors.

Here is

Answer 1

A simple solution "workaround" still is to create a class of virtual functions "interface" and inherit it in the caller class. Then pass it as a parameter "could be in the constructor" of the other class that you want to call your caller class back.

DEFINE Interface:

class CallBack 
{
   virtual callMeBack () {};
};

This is the class that you want to call you back:

class AnotherClass ()
{
     public void RegisterMe(CallBack *callback)
     {
         m_callback = callback;
     }

     public void DoSomething ()
     {
        // DO STUFF
        // .....
        // then call
        if (m_callback) m_callback->callMeBack();
     }
     private CallBack *m_callback = NULL;
};

And this is the class that will be called back.

class Caller : public CallBack
{
    void DoSomthing ()
    {
    }

    void callMeBack()
    {
       std::cout << "I got your message" << std::endl;
    }
};