Use methods as callback in C++ in a convenient way

I want to use methods as callbacks. I know that there is a very generic syntax that allows to use any kind of callable as a callback:

void f(int x) { cout << "f("<<x<<")" << endl; }

class C
{
public:
   void m(int x) { cout << "C::m("<<x<<")" << endl; }
};

class C2
{
public:
   void registerCallback(function<void(int)> f)
   {
      v.push_back(f);
   }

private:
   vector<function<void(int)>> v;

   void callThem()
   {
      for (int i=0; i<v.size(); i++)
      {
         v[i](i);
      }
   }
};

int main()
{
   C2 registrar;

   C c;
   registrar.registerCallback(&f); // Static function
   registrar.registerCallback(bind(&C::m, &c, placeholders::_1)); // Method

   getline(cin, string());

   return 0;
}

Please note that it must be possible to register methods of any kind of class as callbacks.

However I would like to allow the following more convenient syntax for registering methods:

registrar.registerCallback(&C::m, c); // Method

Is it possible to provide a registerCallback() overload that allows a more basic syntax without the need for using bind when registering a method?