How do I move values out of an array one at a time?

Question

I have ownership of an array of size 3 and I would like to iterate on it, moving the elements out as I go. Basically, I would like to have IntoIterator implemen

Answer 1

You may use array of Option instead array of Foo. It has some memory penalty of course. Function take() replaces value in array with None.

#[derive(Debug)]
struct Foo;

// A method that needs an owned Foo
fn bar(foo: Foo) { println!("{:?}", foo); }

fn main() {
    let mut v  = [Some(Foo),Some(Foo),Some(Foo)];

    for a in &mut v {
        a.take().map(|x| bar(x));
    }
}