#include <stdio.h>

struct Library {
  template <class Object,class Function>
  void SetCallback(Object &obj, Function f);
};


struct Object {
  void Method( void );
};

typedef void (Object::*Function)(void);

struct T_CUSTOMER {
  Object o;  
  Function f;
};

T_CUSTOMER customer;

template <class Object,class Function>
void Library::SetCallback( Object &obj, Function f ) {
  customer.o = obj;
  customer.f = f;  
}

void someFunction(void) {
  (customer.o.*customer.f)();
}

struct AnyCustomerClass : Object {
  Library lib;

  AnyCustomerClass() {
    lib.SetCallback( *this, (Function)&AnyCustomerClass::callback );
  }

  void callback(void) {
    printf( "callback!\n" );
  }
};

int main( void ) {

  AnyCustomerClass a;

  someFunction();

}

callback!