CODEWITHSUNDEEP
rust
maku
maku

Reputation: 545

How to match struct fields in Rust?

Can Rust match struct fields? For example, this code:

struct Point {
    x: bool,
    y: bool,
}

let point = Point { x: false, y: true };

match point {
    point.x => println!("x is true"),
    point.y => println!("y is true"),
}

Should result in:

y is true

Upvotes: 48

Views: 30048

Answers (2)

aSpex
aSpex

Reputation: 5216

Can Rust match struct fields?

It is described in the Rust book in the "Destructuring structs" chapter.

match point {
    Point { x: true, .. } => println!("x is true"),
    Point { y: true, .. } => println!("y is true"),
    _ => println!("something else"),
}

Upvotes: 83

Shepmaster
Shepmaster

Reputation: 430681

The syntax presented in your question doesn't make any sense; it seems that you just want to use a normal if statement:

if point.x { println!("x is true") }
if point.y { println!("y is true") }

I'd highly recommend re-reading The Rust Programming Language, specifically the chapters on

Once you've read that, it should become clear that point.x isn't a pattern, so it cannot be used on the left side of a match arm.

Upvotes: 6

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