enums - 按范围匹配枚举

Question

我想知道是否可以将范围匹配器与枚举一起使用。玩具示例:

enum Things {
    One,
    Two,
    Three
}

pub fn main() {
    match One {
        One...Two => println!("one to two"),
        Three => println!("three")
    }
}

错误:

<anon>:9:9: 9:12 error: only char and numeric types are allowed in range [E0029]
<anon>:9         One...Two => println!("one to two"),
                 ^~~
error: aborting due to previous error
playpen: application terminated with error code 101

http://is.gd/rxKMfk

那么，是否有可能实现这样的功能？

Answer 1

不是真的。枚举没有排序。但是，您可以:

enum Things {
    One = 1,
    Two = 2,
    Three = 3
}

pub fn main() {
    match One as uint {
        1..2 => println!("one to two"),
        3 => println!("three")
    }
}