Question

我想知道是否可以使用带枚举的范围匹配器。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，是否有可能做出像这样的工作？

Answer 1

不是真的。枚举没有订购。但是，您可以这样做：

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

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

按范围匹配枚举

1 个答案: