RoaringBitmap

This is a Rust port of the Roaring bitmap data structure, initially defined as a Java library and described in Better bitmap performance with Roaring bitmaps.

Rust version policy

This crate only supports the current stable version of Rust, patch releases may use new features at any time.

Developing

This project uses Clippy, rustfmt, and denies warnings in CI builds. Available via rustup component add clippy rustfmt.

To ensure your changes will be accepted please check them with:

cargo fmt -- --check
cargo clippy --all-targets -- -D warnings

In addition, ensure all tests are passing with cargo test

Benchmarking

It is recommended to run the cargo bench command. The benchmarks directory contains a library that is dedicated to benchmarking the Roaring library by using a set of real-world datasets. It is also advised to run the benchmarks on a bare-metal machine, running them on the base branch and then on the contribution PR branch to better see the changes.

Those benchmarks are designed on top of the Criterion library, you can read more about it on the user guide.

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you shall be dual licensed as above, without any additional terms or conditions.

SIMD

Some operations are accelerated with SIMD, implemented with the fearless_simd crate. When the std feature is enabled, the best available SIMD instruction set is detected at runtime on x86 and x86-64; otherwise, it is determined by the target features enabled at compile time (e.g. with -C target-cpu=native).