memo-map 0.3.3

A crate implementing a synchronized map for memoization
Documentation 
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# memo-map

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A concurrent insert only hash map.

This crate implements a “memo map” which is in many ways similar to a HashMap with some crucial differences:

* Unlike a regular hash map, a memo map is thread safe and synchronized.
* Adding or retrieving keys works through a shared reference, removing only
  through a mutable reference.
* Retrieving a value from a memo map returns a plain old reference.

```rust
use memo_map::MemoMap;

let memo = MemoMap::new();
let one = memo.get_or_insert(&1, || "one".to_string());
let one2 = memo.get_or_insert(&1, || "not one".to_string());
assert_eq!(one, "one");
assert_eq!(one2, "one");
```

## License and Links

- [Documentation](https://docs.rs/memo-map/)
- [Issue Tracker](https://github.com/mitsuhiko/memo-map/issues)
- License: [Apache-2.0](https://github.com/mitsuhiko/memo-map/blob/main/LICENSE)