Automatic Casts redux

class P
{
public:
    void a( );
};

class PW
{
public:
    PW( const P& p ) : p( p ) { }
    void b( );
    P& p;
};

class C
{
public:
    P GetP( ) const { return p; }
private:
    P p;
};

// ...
    PW& p = c.GetP( ); // valid
// ...

// ...
    p->p->a( )
// ...

class P
{
  public:
    void a( ) { std::cout << "a" << std::endl; }
};

class PW
{
  public:
    PW(P& p) : p(p) { }

    void b( ) { std::cout << "b" << std::endl; }

    P & operator*()  { return p;  }
    P * operator->() { return &p; }

  private:
    P & p;
};

class C
{
  public:
    P & getP() { return p; }

  private:
    P p;
};


int main()
{
  C c;
  PW pw(c.getP());

  (*pw).a();
  pw->a();
  pw.b();

  return EXIT_SUCCESS;
}

a
a
b