update_cell

A Cell<Option<T>> that you can update

Why would I need this?

[Cell::update] is currently experimental. And it only supports types that are Copy. So if you want to store and modify something that is neither Copy nor has a Default (eg. a builder), this crate might be useful.

Usage

Add this to your Cargo.toml:

[dependencies]
update_cell = "0.1"

And if you have a struct, you can put it inside and modify it:

use update_cell::UpdateCell;

struct MySuperFancyStruct {
    inner: bool
}

impl MySuperFancyStruct {
    fn new() -> Self {
        Self { inner: false }
    }

    fn toggle(mut self) -> Self {
        self.inner = !self.inner;
        self
    }
}

let mut cell = UpdateCell::new(MySuperFancyStruct::new());
cell.update(|s| s.toggle());

License: MPL-2.0