static void VisitorTest()
{
var items = new List <ItemElement>()
{
new Book(cost: 20, isbn: "1234"),
new Book(cost: 100, isbn: "5678"),
new Fruit(priceKg: 10, wt: 2, nm: "Banana"),
new Fruit(priceKg: 5, wt: 5, nm: "Apple")
};
IShoppingCartVisitor visitor = new ShoppingCartVisitorImpl();
int total = items.Sum(x => x.accept(visitor));
Console.WriteLine("Total Cost = " + total);
}
public int CalculatePrice()
{
var visitor = new ShoppingCartVisitorImpl();
return(_cartItems.Select(cartItem => cartItem.Accept(visitor)).Sum());
}
