# Equivalent [![crates.io](https://img.shields.io/crates/v/equivalent.svg)](https://crates.io/crates/equivalent) [![docs](https://docs.rs/equivalent/badge.svg)](https://docs.rs/equivalent) `Equivalent` and `Comparable` are Rust traits for key comparison in maps. These may be used in the implementation of maps where the lookup type `Q` may be different than the stored key type `K`. * `Q: Equivalent` checks for equality, similar to the `HashMap` constraint `K: Borrow, Q: Eq`. * `Q: Comparable` checks the ordering, similar to the `BTreeMap` constraint `K: Borrow, Q: Ord`. These traits are not used by the maps in the standard library, but they may add more flexibility in third-party map implementations, especially in situations where a strict `K: Borrow` relationship is not available. ## License Equivalent is distributed under the terms of both the MIT license and the Apache License (Version 2.0). See [LICENSE-APACHE](LICENSE-APACHE) and [LICENSE-MIT](LICENSE-MIT) for details. Opening a pull request is assumed to signal agreement with these licensing terms.