rust zero copy serialization

example.rs

fn serialize(value: &[i32]) -> &[u8] {
    let len = value.len() * 4;
    unsafe { std::slice::from_raw_parts(value.as_ptr().cast(), len) }
}

fn deserialize(bytes: &[u8]) -> Vec<i32> {
    assert!(bytes.len() % 4 == 0);
    let mut vec = Vec::<i32>::with_capacity(bytes.len() / 4);
    unsafe {
        std::ptr::copy_nonoverlapping(bytes.as_ptr(), vec.as_mut_ptr().cast(), bytes.len());
        vec.set_len(bytes.len() / 4);
    }
    vec
}

fn main() {
    let vec = vec![15, 11, -2, 300];
    println!("vec = {vec:?}");
    let bytes = serialize(&vec);
    println!("bytes = {bytes:?}");
    let copied_bytes = Vec::from(bytes);
    let restored = deserialize(&copied_bytes);
    println!("restored = {restored:?}");
}