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#### 5.1.3 强类型枚举
```
enum class Type {a,b,c,d};
```
优势:
1. 强作用域
2. 转换限制(禁止隐式转换)
3. 可以指定底层类型
```
enum class Type : char {a,b,c,d};//指定了类型
```