Function basic

publication/code/chapter04/deque.rs:140–164

()

    iter();

    fn basic() {
        let mut d = Deque::new(4);
        let _r1 = d.add_front(1);
        let _r2 = d.add_front(2);
        let _r3 = d.add_rear(3);
        let _r4 = d.add_rear(4);
        if let Err(error) = d.add_front(5) {
            println!("add_front error: {error}");
        }
        println!("{:?}", d);

        match d.remove_rear() {
            Some(data) => println!("remove rear data {data}"),
            None => println!("empty deque"),
        }
        match d.remove_front() {
            Some(data) => println!("remove front data {data}"),
            None => println!("empty deque"),
        }
        println!("empty: {}, len: {}", d.is_empty(), d.len());
        println!("full: {}, {:?}", d.is_full(), d);

        d.clear();
        println!("{:?}", d);
    }

    fn iter() {
        let mut d = Deque::new(4);