push_array.rs

// date: 2022-05-09
// license: GPLv3 https://www.gnu.org/licenses/gpl-3.0.txt
// author: nanpuyue <nanpuyue@gmail.com> https://blog.nanpuyue.com

use std::mem::take;

fn push(buf: &mut &mut [u8], value: u8) {
    buf[0] = value;
    *buf = &mut take(buf)[1..];
}

fn main() {
    let mut buf = [0; 8];

    let mut cur = &mut buf[..];
    println!("cur: {cur:p}, {cur:?}");
    for i in 1..=8 {
        push(&mut cur, i);
        println!("cur: {cur:p}, {cur:?}");
    }

    println!("buf: {buf:?}");
}