public void Visit(Recipe recipe)
{
foreach (ICostable costableItem in recipe.CostableItems)
{
costableItem.Accept(this);
recipe.Cost += costableItem.Cost;
}
}
static void Main(string[] args)
{
Recipe recipe = new Recipe();
Choice chipsOrMash = new Choice();
Product beans = new Product();
Product sausages = new Product();
Product chips = new Product();
Product mash = new Product();
recipe.CostableItems.Add(beans);
recipe.CostableItems.Add(sausages);
recipe.CostableItems.Add(chipsOrMash);
chipsOrMash.CostableItems.Add(chips);
chipsOrMash.CostableItems.Add(mash);
Visitor visitor = new Visitor();
recipe.Accept(visitor);
Console.WriteLine(recipe.Cost);
}