Rust
,
Source
Edit
History

ref in Rust

When doing pattern matching or destructuring via let binding, the ref keyword can be used to take references to the field of a struct/tuple.

A ref borrow on the left side of an assignment is equivalent to an & borrow on the right side.

1
2
3
4
5
6
7
8
9
10
11
12
13
fn main() {
    let i = 3;
    {
        let borrow1 = &i;

        println!("borrow1: {}", borrow1);
    }
    
    {
        let ref borrow2 = i;
        println!("borrow2: {}", borrow2);
    }
}

Destructuring a struct:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
struct Point {
    x: i32,
    y: i32
}

fn main() {
    let point = Point{x: 1, y: 2};

    let Point{x: xx, y: yy} = point;
    println!("{} {}", xx, yy);

    let Point{x: ref xx, y: ref yy} = point;
    println!("{} {}", *xx, *yy);
}