Function iter

publication/code/chapter04/lvec.rs:213–228

()

    }

    fn iter() {
        let mut lvec: LVec<i32> = LVec::new();
        lvec.push(10); lvec.push(11);
        lvec.push(12); lvec.push(13);

        let sum1 = lvec.iter().sum::<i32>();
        let mut addend = 0;
        for item in lvec.iter_mut() {
            *item += 1;
            addend += 1;
        }
        let sum2 = lvec.iter().sum::<i32>();
        println!("{sum1} + {addend} = {sum2}");

        assert_eq!(50, lvec.into_iter().sum::<i32>());
    }
}