如何获取枚举的整数值？

Question

可以编写这样的结构:

enum Number {
    One = 1,
    Two = 2,
    Three = 3,
    Four = 4,
}

但出于什么目的？我找不到任何方法来获取枚举变量的值.

Answer 1

通过将枚举变量强制转换为整数类型来获取值:

enum Thing {
    A = 1,
    B = 2,
}

fn main() {
    println!("{}", Thing::A as u8);
    println!("{}", Thing::B as u8);
}