You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sliding_window.rs
    path of file: ./repos/deep_causality/dcl_data_structures/examples
    
    the code of the file until where you have to start completion: // SPDX-License-Identifier: MIT
// Copyright (c) "2023" . The DeepCausality Authors. All Rights Reserved.
use dcl_data_structures::prelude::{window_type, ArrayStorage, SlidingWind
    
pub fn main() {
    let mut window = get_sliding_window();
    assert_eq!(window.size(), SIZE);

    // Filled means, the window holds 4 elements.
    assert!(!window.filled());

    // If you try to access an element before the window id filled, you get an error.
    let res = window.first();
    assert!(res.is_err());

    let res = window.last();
    assert!(res.is_err());

    // Add some data
    window.push(Data { dats: 3 });
    window.push(Data { dats: 2 });
    window.push(Data { dats: 1 });
    window.push(Data { dats: 0 });
    assert!(window.filled());

    // Now we can access elements of the window
    // Last element added was 0
    let res = window.last();
    assert!(res.is_ok());
    let data = res.unwrap();
    assert_eq!(data.dats, 0);

    // First (oldest) element added was 3
    let res = window.first();
    assert!(res.is_ok());
    let data = res.unwrap();
    assert_eq!(data.dats, 3);

    // When we add more data after the window filled,
    // the "last" element refers to the last added
    // and the oldest element will be dropped.
    // This shifts the order of the elements in the window.

    let d = Data { dats: 42 };
    window.push(d);

    let res = window.last();
    assert!(res.is_ok());

    let data = res.unwrap();
    assert_eq!(data.dats, 42);

    // Because 42 was added at the front,
    // 3 was dropped at the end therefore
    // the oldest element is now 2
    let res = window.first();
    assert!(res.is_ok());
    let data = res.unwrap();
    assert_eq!(data.dats, 2);
}