C++ implementing callback functions

Question

I know this question has been discussed many other times but it seems I can find an answer that I can fully understand.

My Question is how to pass a member function to a second class as a callback in CPP and without using boost library.

I keep encountering Api calls where callback logic is implemented like this. entity.func(MyClass::somemethod, this);

and I'd like to use this kind of notation;

----------------------------DeviceHub Class-------------------------

DeviceHub instantiates n VirtualDevices that requires a DeviceHub method to be passed as callback so that the VirtualDevice object can notify the DeviceHub object.

class DeviceHub{
  public: 
  DeviceHub(int n);
  virtual ~DeviceHub();

  int virtualDeviceCallback(std::string s);

  std::vector<VirtualDevice> virtual_devices;
}

DeviceHub::DeviceHub(int n){
  int i;
  for(i = 0; i < n; i++){
     VirtualDevice vd = VirtualDevice(...,this); //pass callback method and context
     virtual_devices.push_back(vd);
  }
}

 DeviceHub::virtualDeviceCallback(std::string s){
  /*do something...*/
 }

----------------------------VirtualDevice Class-------------------------

class VirtualDevice{

  public: 

  VirtualDevice(callbackmethod, context);
  virtual ~VirtualDevice();
  int id;
}

VirtualDevice::VirtualDevice(callbackmethod, context){
    //do something
    //than fire callback
    //context.callbackmethod("some string");
}