Does matches! macro support enum decouple?

help
1

See playground

It seems that the enum decouple didn't take affect in matches! macro

if matches!(color, E::Color(a1, a2, a3)) {
    println!("{}, {}, {}", a1, a2, a3);
}

For this short example, I need to write this code instead

    match color {
        E::Color(a1, a2, a3) => {
            println!("{}, {}, {}", a1, a2, a3);
        }
        _ => {}
    }
2 
    if let E::Color(a1, a2, a3) = color {
        println!("{}, {}, {}", a1, a2, a3);
    }

matches! is only for returning a bool result, not for using variables in the pattern match later.

9 Likes
3

Yes, indeed. But this is very useful in this scenario. This is so convenient that I'm going to write it like this.

But I can't find your answear from the document

4

That is true, the doc for matches! only tells you what it does, not what it does not do:

Returns whether the given expression matches the provided pattern.

You can find more information on if let ... here in the book.

6

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