Working with classes

Classes make things a lot easier when dealing with objects. They do the simplest necessary thing in OOP: they combine data with functions for manipulating data. Let's rewrite the example of the Product struct using a class and its powerful features:

class Product {
public:
  Product() = default; // default constructor
  Product(const Product&); // copy constructor
  Product(Product&&); // move constructor

  Product& operator=(const Product&) = default;
  Product& operator=(Product&&) = default;
  // destructor is not declared, should be generated by the compiler
public:
  void set_name(const std::string&);
  std::string name() const;
  void set_availability(bool);
  bool available() const;
  // code omitted for brevity

private:
  std::string name_;
  double price_;
  int rating_;
  bool available_;
};

std::ostream& operator<&lt...