Help with boost::function and boost::bind

From: electricsnark (CGLeggett_at_[hidden])
Date: 2002-11-13 18:10:21

I need to make a registry of callback functions, which are in
the form of member functions of objects of various types.

----------- code snippet -----------

class T1 {
  public: 
   void CallBackFcn();
};

...

class Registry {

public:
   template <typename T>
   void registerFcn (void (T::*updFcn)(), T* obj );

private:
   vector< boost::function<void>* > fcnvec;
};

template <typename T>
void Registry::registerFcn(void (T::*updFcn)(), T* obj) {

  boost::function<void> *fp = new boost::function<void> ( 
                              boost::bind(updFcn,obj) );

  fcnvec.push_back( fp );

}

main() {

 ....

  T1 *pt = new T1;
  p_Registry->registerFcn(&T1::CallBackFcn, pt);

}

-----------------------------------------------------

However, before adding the boost::function to the vector, I want
to make sure that the callback function isn't already in there.
Unfortunately, I can't just look at value of the pointer fp - I 
need to get to the address of the actual callback function that 
is to be executed. But I can't figure out how to get there.

Any help appreciated.