Should a reference to an enum be dereferenced before it is matched?

Question

As a newcomer to Rust, I\'ve stumbled upon two apparently valid ways of running a match on a reference type.

I\'ve defined an enum:

enum         


        

Answer 1

As of Rust 1.26, the idiomatic solution is neither; you don't have to dereference the value or add & to the patterns:

fn contains_blue(&self) -> bool {
    match self {
        Color::Blue => true,
        Color::Teal => true,
        Color::Purple => true,
        _ => false,
    }
}

This is thanks to improved match ergonomics.

You can also use pattern alternation in this case:

match self {
    Color::Blue | Color::Teal | Color::Purple => true,
    _ => false,
}