Shared via Rust Playground

playground.rs

#![allow(unused)]

#[derive(Debug)]
struct IntegerArrayBag<'a> {
    arr: &'a [i32],
    idx: usize,
}

impl<'a> IntegerArrayBag<'a> {
    fn len(&self) -> usize {
        self.arr.len()
    }

    fn get(&self, idx: usize) -> Option<&'a i32> {
        if self.arr.len() > idx {
            Some(&self.arr[idx])
        } else {
            None
        }
    }
}

impl<'a> Iterator for IntegerArrayBag<'a> {
    type Item = &'a i32;

    fn next(&mut self) -> Option<&'a i32> {
        let idx = self.idx;
        self.idx += 1;
        self.get(idx)
    }
}

fn main() {

}