Перегрузка operator>> и operator<< в абстрактном классе

class transport {
protected:
    float speed, cost;
    virtual istream& operator >>(istream&) = 0;
    virtual ostream& operator <<(ostream&) = 0;
};
 
class electric_transport :public transport {
public:
    istream& operator >>(istream &in) override{
        cout << "Enter the speed of electric transport: " << endl;
        in >> speed;
        cout << "Enter the cost of electric transport: " << endl;
        in >> cost;
        return in;
    }
    ostream& operator <<(ostream &out) override {
        out << "Information of electric transport\n"<< "Speed: " \
            << speed << "\nCost: " << cost << endl;
        return out;
    }
};

electric_transport et;
transport& ts=et;
ts>>cin;
ts<<cout;

class transport {
protected:
    float speed, cost;
public:
    virtual istream& operator >>(istream&) = 0;
    virtual ostream& operator <<(ostream&) = 0;
};

cin >> ts;

class transport {
protected:
    float speed, cost;
    
    virtual std::istream& read(std::istream &) = 0;
    virtual std::ostream& write(std::ostream &) const = 0;
    
    friend std::istream& operator>>(std::istream & in, transport & v)
    {
        return v.read(in);
    }
    friend std::ostream& operator<<(std::ostream & out, transport const & v)
    {
        return v.write(out);
    }
};