我可以将某个枚举的枚举限制在另一个枚举的某些情况下吗？ [英] Can I restrict an enum to certain cases of another enum?

问题描述

说我有一个面包店和一个原料清单：

 枚举成分{
 case flower = 1 
 case sugar = 2 
 case yeast = 3 
 case eggs = 4 
 case milk = 5 
 case almonds = 6 
 case chocolate = 7 
 case salt = 8 
} 
  

案例 rawValue 表示库存号码。

然后我有两个食谱：

巧克力蛋糕： / h3>

• 500g花


• 300g糖



• 200ml牛奶


• 200g巧克力

杏仁蛋糕：

• 300g花


• 200g糖


• 20g酵母


• 200g杏仁


• 5个鸡蛋


• 2g盐






现在我定义一个函数

  func bake（含成分：[成分]） - >蛋糕
  

当然，我相信我的员工，但我仍然想确保他们只使用正确的成分烤蛋糕

Say I have a bakery and an inventory of ingredients:

enum Ingredient {
    case flower     = 1
    case sugar      = 2
    case yeast      = 3
    case eggs       = 4
    case milk       = 5
    case almonds    = 6
    case chocolate  = 7
    case salt       = 8
}

A case's rawValue represents the inventory number.

Then I have two recipes:

Chocolate Cake:

• 500g flower
• 300g sugar
• 3 eggs
• 200ml milk
• 200g chocolate

Almond Cake:

• 300g flower
• 200g sugar
• 20g yeast
• 200g almonds
• 5 eggs
• 2g salt

Now I define a function

func bake(with ingredients: [Ingredient]) -> Cake

Of course I trust my employees, but I still want to make sure they only use the right ingredients to bake a cake.

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