memcell - A utility crate which provides MemoryCell, a struct that stores a current and previous value, no cloning included

NOTE: This crate is mostly just a utility. I was looking for a crate that does this, and found none. I made it because why not.

Minimal example

use memcell::MemoryCell;

fn main() {
    let mut cell = MemoryCell::new(5_u32);

    let new_value = 10;
    cell.update(new_value);

    assert_eq!(cell.current(), &10);
    assert_eq!(cell.last(), &Some(5));
}

MemoryCell definition

#[derive(Debug, Clone)]
pub struct MemoryCell<T> {
    current: T,
    last_val: Option<T>,
}

The update function does not clone any values by taking advantage of Rust's std::mem::replace.

Link to the crate: https://crates.io/crates/memcell\
Repository: https://github.com/ImajinDevon/memcell