# predicates-rs > An implementation of **boolean-valued predicate functions** in Rust. [![Documentation](https://img.shields.io/badge/docs-master-blue.svg)](https://docs.rs/predicates) ![License](https://img.shields.io/crates/l/predicates.svg) [![Crates.io](https://img.shields.io/crates/v/predicates.svg?maxAge=2592000)](https://crates.io/crates/predicates) [Changelog](https://github.com/assert-rs/predicates-rs/blob/master/CHANGELOG.md) ## Usage First, add this to your `Cargo.toml`: ```toml [dependencies] predicates = "3.1.2" ``` Next, add this to your crate: ```rust extern crate predicates; use predicates::prelude::*; ``` For more information on using predicates, look at the [documentation](https://docs.rs/predicates) ## License `predicates-rs` is distributed under the terms of both the MIT license and the Apache License (Version 2.0). * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or ) * MIT license ([LICENSE-MIT](LICENSE-MIT) or ) ## Credits Big thanks to [futures-rs](https://github.com/alexcrichton/futures-rs), whose slick API design informed a lot of decisions made on the API design of this library.