The Ultimate Guide to Rust Programming/

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Mutable to Immutable

Mutable to Immutable

We'll cover the following...

Does the following program compile?

Rust 1.40.0
fn printme(x: &i32) {
    println!("{}", x);
}
fn main() {
    printme(&5);
}

It sure does! We only read from the immutable reference, x, and therefore everything is fine. How about this program?

Rust 1.40.0
fn printme(x: &mut i32) {
    println!("{}", x);
}
fn main() {
    printme(&mut 5);
}

Yes, this is fine as well. We have a mutable reference, x, which allows both reading and writing values. ...