r30m-ownership-3.rs

fn sum(vector: &mut Vec<i32>) -> i32 {
    let mut sum = 0;

    vector.iter_mut().map(|e| e.add(1));

    for item in vector {
        sum = sum + *item
    }

    sum
}

fn main() {
    let mut v = vec![1,2,3];
    let s = sum(&mut v);

    println!("sum of {:?}: {}", v, s);
}