Concrete Element Classes (Book and Fruit):?

• The concrete element classes Book and Fruit implement the

IShoppingCartElement interface. Each class has a price and the Accept

method that allows the visitor to perform an operation on it.

public class Book : IShoppingCartElement
{
public double Price { get; }
public Book(double price) => Price = price;
public void Accept(IShoppingCartVisitor visitor) =>

visitor.Visit(this);

}
public class Fruit : IShoppingCartElement
{
public double Price { get; }
public Fruit(double price) => Price = price;
public void Accept(IShoppingCartVisitor visitor) =>

visitor.Visit(this);

}