Rust slices

slices.rs

// https://stackoverflow.com/questions/28219231/how-to-idiomatically-copy-a-slice
fn copy_slice<T: Copy>(src: &[T], dst: &mut [T]) -> usize {
    let mut c = 0;
    for (d, s) in dst.iter_mut().zip(src.iter()) {
        *d = *s;
        c += 1;
    }
    c
}

fn main() {
    println!("Hello, 世界");
    let x: [u8; 5] = [5, 4, 3, 2, 1];
    let mut y: [u8; 5] = [0; 5];

    println!("x:{:?}", x);
    println!("y:{:?}", y);

    copy_slice(& x, &mut y);
    y.sort();

    println!("x:{:?}", x);
    println!("y:{:?}", y);

    let z = vec![4u8, 1, 5, 3, 2];
    println!("z:{:?}", z);
    let mut a = vec![0u8; z.len()];
    copy_slice(& z, &mut a);
    println!("a:{:?}", a);
    a.sort();
    println!("a:{:?}", a);

    // Hello, 世界
    // x:[5, 4, 3, 2, 1]
    // y:[0, 0, 0, 0, 0]
    // x:[5, 4, 3, 2, 1]
    // y:[1, 2, 3, 4, 5]
    // z:[4, 1, 5, 3, 2]
    // a:[4, 1, 5, 3, 2]
    // a:[1, 2, 3, 4, 5]
}