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rust enum with fixed values

Zwazel answered on November 10, 2022 Popularity 7/10 Helpfulness 7/10

answer rust enum with fixed values

related rust enum with value

rust enum with fixed values

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enum MyEnum {
    A,
    B,
}

impl MyEnum {
    fn value(&self) -> i32 {
        match *self {
            MyEnum::A => 123,
            MyEnum::B => 456,
        }
    }
}
// call like some_myenum_value.value()

Popularity 7/10 Helpfulness 7/10 Language rust

Source: stackoverflow.com

Tags: fixed rust

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Contributed on Nov 10 2022

Zwazel

0 Answers Avg Quality 2/10

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rust enum with value

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// method 1:

enum Enum {
	Foo, 	   // 0
    Bar = 9,   // 9
    Baz        // 10
}

// method 2: (for a string enum)

enum Enum {
    Foo,
    Bar,
    Baz,
}

impl std::fmt::Display for Enum {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let out = match self {
            Enum::Foo => "FOO",
            Enum::Bar => "BAR",
            Enum::Baz => "BAZ",
        };

        write!(f, "{}", out)
    }
}

impl std::str::FromStr for Enum {
    type Err = String;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s {
            "FOO" => Ok(Enum::Foo),
            "BAR" => Ok(Enum::Bar),
            "BAZ" => Ok(Enum::Baz),
            _ => Err(format!("Unknown enum value: {}", s)),
        }
    }
}

fn main() {
    let foo: Enum = "FOO".parse().unwrap();
    println!("{}", foo.to_string());
    let bar: Enum = "BAR".parse().unwrap();
    println!("{}", bar.to_string());
    let baz: Enum = "BAZ".parse().unwrap();
    println!("{}", baz.to_string());
    // let qux: Enum = "QUX".parse().unwrap(); // This will panic
    // println!("{}", qux);
}

Popularity 9/10 Helpfulness 2/10 Language whatever

Source: Grepper

Tags: whatever rust ru

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Contributed on Aug 27 2023

John Appleseed

0 Answers Avg Quality 2/10

rust enum with fixed values

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