croaring-rs 
A Rust wrapper for CRoaring (a C/C++ implementation at https://github.com/RoaringBitmap/CRoaring)
The original java version can be found at https://github.com/RoaringBitmap/RoaringBitmap
Bitmap usage example
use croaring::Bitmap;
let mut rb1 = Bitmap::create();
rb1.add(1);
rb1.add(2);
rb1.add(3);
rb1.add(4);
rb1.add(5);
rb1.add(100);
rb1.add(1000);
rb1.run_optimize();
let mut rb2 = Bitmap::create();
rb2.add(3);
rb2.add(4);
rb2.add(1000);
rb2.run_optimize();
let mut rb3 = Bitmap::create();
assert_eq!(rb1.cardinality(), 7);
assert!(rb1.contains(3));
rb1.and_inplace(&rb2);
rb3.add(5);
rb3.or_inplace(&rb1);
let mut rb4 = Bitmap::fast_or(&[&rb1, &rb2, &rb3]);
rb1.and_inplace(&rb2);
println!("{:?}", rb1);
rb3.add(5);
rb3.or_inplace(&rb1);
println!("{:?}", rb1);
rb3.add(5);
rb3.or_inplace(&rb1);
println!("{:?}", rb3.to_vec());
println!("{:?}", rb3);
println!("{:?}", rb4);
rb4 = Bitmap::fast_or(&[&rb1, &rb2, &rb3]);
println!("{:?}", rb4);For 64bit Bitmap support, checkout the Treemap. Treemap is not API-compatible with Bitmap, yet most the functionality is overlapping.
Treemap usage example
use std::u64;
use croaring::Treemap;
let mut treemap = Treemap::create();
treemap.add(u64::MAX);
treemap.remove(u64::MAX);
/// Serialization compatible with croaring Treemap version at https://github.com/RoaringBitmap/CRoaring/blob/b88b002407b42fafaea23ea5009a54a24d1c1ed4/cpp/roaring64map.hh
use croaring::treemap::NativeSerializer;
let mut treemap1 = Treemap::create();
for i in 100..1000 {
treemap1.add(i);
}
treemap1.add(std::u32::MAX as u64);
treemap1.add(std::u64::MAX);
/// Serialization compatible with JVM Treemap version at https://github.com/RoaringBitmap/RoaringBitmap/blob/34654b2d5c3e75e7f9bca1672f4c0b5800d60cf3/roaringbitmap/src/main/java/org/roaringbitmap/longlong/Roaring64NavigableMap.java
use croaring::treemap::JvmSerializer;
let mut treemap2 = Treemap::create();
for i in 100..1000 {
treemap2.add(i);
}
treemap2.add(std::u32::MAX as u64);
treemap2.add(std::u64::MAX);Building
git clone --recursive https://github.com/RoaringBitmap/croaring-rs/
cd croaring-rs
cargo build
In croaring-rs, just like in CRoaring,
some CPU related code optimizations are enabled dynamically at runtime. If you are
building binaries for specific CPU architectures you can specify ROARING_ARCH environment
variable to control enabled code optimizations, e.g.
ROARING_ARCH=ivybridge cargo build --release.
C binding generation
Since version 0.7.0 croaring-rs ships with pre-generated bindings to CRoaring library
in order to speed up builds and remove the need for a recent clang version. However
you can revert to old behaviour and generate bindings with bindgen during build time. In
order to do it please use buildtime_bindgen feature flag, e.g.:
[dependencies.croaring]
version = "0.7"
features = ["buildtime_bindgen"]
Testing
Running unit tests and doc tests:
cargo test
Running benchmark suite (currently on Rust nightly toolchain only):
cargo bench
Documentation
Current documentation is available at https://docs.rs/croaring/latest/croaring/