duals 0.0.1

dual-ownership referance cells
Documentation 
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# `Duals`

Dual-Ownership Reference Cells


These are similar to `Rc` and `Arc`, but ensure that only two references exist.

- [Documentation](https://docs.rs/duals)
- [crates.io](https://crates.io/duals)
- [Repository](https://github.com/samhdev/duals)

### Example

```rust
use duals::Dual;

// create a new `Dual`
let (left, right) = Dual::new(10);

// use both
println!("{:?} {:?}", *left, *right);

// drop one reference
drop(left);

// we can still use the other
println!("{:?}", *right);

// drop the other reference; value is dropped
drop(right);
```