enum-display-derive:派生显示自动枚举简单的枚举

枚举的派生显示特征 此板条箱可以为非常简单的枚举派生一个Display实现，如下所示： #[macro_use] extern crate enum_display_derive; use std :: fmt :: Display; #[derive(Display)] enum FizzBuzz { Fizz, Buzz, FizzBuzz, Number ( u64 ), } fn fb (i: u64 ) -> FizzBuzz { match (i % 3 , i % 5 ) { ( 0 , 0 ) => FizzBuzz :: FizzBuzz, ( 0 , _) => FizzBuzz :: Fizz, (_, 0 ) => FizzBuzz :: Buzz, (_, _) => Fizz