t_wの輪郭

fn main() {
    enum SpreadsheetCell {
        Int(i32),
        Float(f64),
        Text(String),
    }
    
    let row = vec![
        SpreadsheetCell::Int(3),
        SpreadsheetCell::Text(String::from("blue")),
        SpreadsheetCell::Float(10.12),
    ];

    for r in &row {
        match r {
            SpreadsheetCell::Int(i) => println!("{}", i),
            SpreadsheetCell::Text(s) => println!("{}", s),
            SpreadsheetCell::Float(f) => println!("{}", f),
        }
    }
}

3
blue
10.12

https://doc.rust-jp.rs/book-ja/ch08-01-vectors.html#enumを使って複数の型を保持する