How to write/read 8 true/false in a single byte on rust language

Question

Everyone knows that bool uses 1 byte and not 1 bite.

In case I want to store 8 (or more) true/false in a single byte, how can I do it on Rust?

Something like this:

fn main()
{
   let x:ByteOnBits;
   x[3]=true;
   if x[4]
   {
      println!("4th bit is true");
   }
}

an array of 8 bools would be 8 bytes, not 1 byte as I am expecting.

Answer 1

The bitvec crate provides facilities of the kind you're asking for:

use bitvec::prelude::*;

fn main() {
    let mut data = 0u8;
    let bits = data.view_bits_mut::<Lsb0>();
    bits.set(3, true);
    if bits[4] {
        println!("xxx");
    }
    assert_eq!(data, 8);
}