열거형

enum 키워드는 몇가지 유형(variant)으로 표현되는 타입을 생성합니다:

fn generate_random_number() -> i32 {
    // Implementation based on https://xkcd.com/221/
    4  // Chosen by fair dice roll. Guaranteed to be random.
}

#[derive(Debug)]
enum CoinFlip {
    Heads,
    Tails,
}

fn flip_coin() -> CoinFlip {
    let random_number = generate_random_number();
    if random_number % 2 == 0 {
        return CoinFlip::Heads;
    } else {
        return CoinFlip::Tails;
    }
}

fn main() {
    println!("You got: {:?}", flip_coin());
}