Crate crumb

Encode an index of a nibble from a u64 as a u8.

| 4 bits | 4 bits |

| index of nibble | nibble of data |

Usage

use crate::CrumbExt;
 
fn main() {
    let test: u64 = 0b11111111;
    // let crumb: u8 = unsafe { test.get_unchecked_crumb(1) };
    let crumb: u8 = test.get_crumb(1).unwrap();
    assert_eq!(0b11110000u64, u64::from_crumb(crumb));
}

Name

A nibble of something is about the size of a crumb or something like that...

How?

Was doing some research on variable length integers and realized how nicely this fits.

Why?

I don't think there are too many applications for this, I have one in mind but that is an entire project in itself.

Traits

CrumbExt

this is NOT intended to be implemented in anything but u64, it is only pub for documentation