Borrowing

Temporary access with &T and &mut T.

Mutable borrow

Only one mutable borrow at a time. Finish using it before returning to the owner.

fn main() {
    mut x = 1
    let r = &mut x
    print(*r)
    unsafe {
        *r = 5
    }
    print(x)
}

fn main() -> void {
    mut x = 1
    let r = &mut x
    print(*r)
    unsafe {
        *r = 5
    }
    print(x)
}

Output

1
5

Multiple &T borrows are allowed together.

fn main() {
    let msg = "hello"
    let r = &msg
    print(*r)
    print(msg)
}

fn main() -> void {
    let msg: string = "hello"
    let r = &msg
    print(*r)
    print(msg)
}

Output

hello
hello