arc-ext

Extensions for Arc<T> such as field projection.

Usage

The ArcExt trait implementation extends Arc<T> with .project and .project_option methods.

The projection enforces lifetimes, so that no reference to it can outlive the projection (and therefore is not unsound).

See the following example:

```rust use arc_ext::ArcExt;

[derive(Debug, PartialEq, Eq)]

struct Top { nested: Nested, string: String, }

[derive(Debug, PartialEq, Eq)]

struct Nested { a: u32, b: Box<[u8]>, c: Option>, }

fn test() { let top = Arc::new(Top { nested: Nested { a: 32, b: vec![1, 2, 3, 4].intoboxedslice(), c: Some(Arc::new(Top { nested: Nested { a: 12, b: vec![99].intoboxedslice(), c: None, }, string: "nested".tostring(), })), }, string: "owned str".tostring(), });

let project = top.clone().project(|x| &x.nested.b);
assert_eq!(&[1, 2, 3, 4], &**project);
drop(project);

let project = top.clone().project_option(|x| x.nested.c.as_ref());
let opt = project.as_option().unwrap();
assert_eq!(top.nested.c.as_ref().unwrap(), opt);

}

```

License

This project is licensed under either of

at your option.