polymorphism c++

[xnorax]

  class Butterflyfish
{
protected:
    string Btype;
public:
    virtual string type()
    {
       	return Btype;
    }
    
    void display()
    {
        cout<<"Fish type= "<<Btype<<endl;
    }
};
class Forcipiger :public Butterflyfish{
private:
    string Ftype;
public:
    virtual string type()
    {
       	return Ftype;
    }
};


int  main()
{
     Forcipiger f;
     Butterflyfish *b[3];
     b[0]=&f;
     b[0]->display();
    return 0;}

Q1: to print every derived type, what's better
1) copy display function and make it virtual
2) replace "attribute name" with "virtual type function name" in Base Class
as

void display()
    {
        cout<<"Fish type= "<<type()<<endl;
    }

[keskiverto]

http://www.gotw.ca/publications/mill18.htm

[xnorax]

it is useful, but I'm not asking about type specifiers!
Thank you

[keskiverto]

What type specifiers?

[xnorax]

public, protected and private

[keskiverto]

Look at Guideline #2. What does it imply?

[xnorax]

So you mean
2) replace "attribute name" with "virtual type function name" in Base Class
then make virtual function private?
because I tried it when it is public and it works good

[keskiverto]

Good.