Hello,
I've got this problem; probabily about inheritance:
Any hints, please?Code:class Fruit { } class DriedFruit : public Fruit { } class Walnut : public DriedFruit { float _kCalories; public: Walnut (float cal = 0) : _kCalories(0) { } ~Walnut() { } friend std::ostream& operator<<(std::ostream& os, Walnut& w) { return os << "provence = " << "\t" << "protein = " << w._kCalories<< endl; } }; //main.cpp Fruit* f = new Walnut; cout << *f; //error error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'Fruit' (or there is no acceptable conversion) //and many others....