The real final, ultimate body class

void cube::identify(ostream &os)

{

os << "cube of length " << length

<< " " << color;

}

We make “traditional” member functions identify(ostream&) for our classes (which have nothing to do with the << operators)

void cylinder::identify(ostream &os)

{

os << "cylinder of radius " << radius

<< " height " << height

<< " " << color;

}

ostream& operator<< (ostream& os, cube &c)

{

c.identify(os);

return os;

}

ostream& operator<< (ostream& os, cylinder &c)

{

c.identify(os);

return os;

}

and we let the non-member operator<< functions call the (public) member functions; no problem here:

ostream& operator<< (ostream& os, body &b)

{

b.identify(os);

return os;

}

but now also body can easily have a operator<< non-member function which calls the proper member function and so gives the proper output.

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