Query Regarding Observer Pattern

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C++

patterns

Hallo Rahul Rajat Singh,
I have small question regarding Observer Pattern in C++.
Isn't it the

class ASubject
{
    //Lets keep a track of all the shops we have observing
    std::vector<iobserver*> list;

public:
    void Attach(IObserver *product);
    void Detach(IObserver *product);
    void Notify(float price); 
};

and Shop should be publicly derived from IObserver ?

class Shop : public IObserver
{
    //Name of the Shop
    std::string name;
    float price;
public:
    Shop(std::string n); 
    void Update(float price);   
    ~Shop() { std::cout << " In ~Shop()" << "\n";}
};