References and Borrowing

https://doc.rust-lang.org/book/references-and-borrowing.html を途中まで。 特別気になる箇所はなし。

fn main() {

    fn sum_vec(v: &Vec<i32>) -> i32 {
        return v.iter().fold(0, |a, &b| a + b);
    }

    fn foo(v1: &Vec<i32>, v2: &Vec<i32>) -> i32 {
        let s1 = sum_vec(v1);
        let s2 = sum_vec(v2);
        s1 + s2
    }

    let v1 = vec![1, 2, 3];
    let v2 = vec![4, 5, 6];

    let answer = foo(&v1, &v2);
    println!("{}", answer);
}