rust eq for enums

Bolt answered on September 18, 2022 Popularity 3/10 Helpfulness 8/10

answer rust eq for enums

rust eq for enums

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// https://stackoverflow.com/questions/36297412/how-to-implement-partialeq-for-an-enum

//normally, you would just use #[derive(PartialEq)], like so:


#[derive(PartialEq)]
enum Either<T, U> {
    Left(T),
    Right(U),
}

//If you need to implement it manually: 

impl<T: PartialEq, U: PartialEq> PartialEq for Either<T, U> {
    fn eq(&self, other: &Self) -> bool {
        use Either::*;

        match (self, other) {
            (&Left(ref a), &Left(ref b)) => a == b,
            (&Right(ref a), &Right(ref b)) => a == b,
            _ => false,
        }
    }
}


//in modern Rust, you can write the same thing with less noise because more implicit referencing / dereferencing occurs when pattern matching:


impl<T: PartialEq, U: PartialEq> PartialEq for Either<T, U> {
    fn eq(&self, other: &Self) -> bool {
        use Either::*;
        match (self, other) {
            (Left(a), Left(b)) => a == b,
            (Right(a), Right(b)) => a == b,
            _ => false,
        }
    }
}

Popularity 3/10 Helpfulness 8/10 Language rust

Source: Grepper

Tags: enums rust

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Contributed on Sep 18 2022

Bolt

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