■ enum 키워드를 사용해 열거형을 만드는 방법을 보여준다.
▶ 예제 코드 (RS)
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enum Currency { Currency100(isize), Currency500(isize), Currency1000(isize), Currency5000(isize), Currency10000(isize), Currency50000(isize) } impl Currency { fn calculate_amount(&self) -> isize { match *self { Currency::Currency100 (value) => value * 100, Currency::Currency500 (value) => value * 500, Currency::Currency1000 (value) => value * 1000, Currency::Currency5000 (value) => value * 5000, Currency::Currency10000(value) => value * 10000, Currency::Currency50000(value) => value * 50000 } } } fn main() { let currency_vector : Vec<Currency> = vec! [ Currency::Currency100(3), Currency::Currency500(2), Currency::Currency1000(6), Currency::Currency5000(1), Currency::Currency10000(8), Currency::Currency50000(3) ]; let total_amount : isize = currency_vector.iter().fold(0, |total_amount, v| total_amount + v.calculate_amount()); println!("전체 금액 : {}", total_amount); } |