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Interface

• To define a class, we first need to specify an interface.
• The interface consists of all member functions we want to apply to objects of that type.
• The interface is specified in the class definition.
• Example: Product class member functions:
  • Make a new product.
  • Read in a product object.
  • Compare two products and find out which one is better.
  • Print a product.
• Product class header:

  class Product
  {
  public:
     Product();
     void read();
     bool is_better_than(Product b) const;
     void print() const;
  private:
     implementation details
  };
  

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