Add this to your Cargo.toml:

[dependencies]
bit-set = "0.8"

Since Rust 2018, extern crate is no longer mandatory. If your edition is old (Rust 2015), add this to your crate root:

extern crate bit_set;

If you want to use serde, enable it with the serde feature:

[dependencies]
bit-set = { version = "0.8", features = ["serde"] }

If you want to use bit-set in a program that has #![no_std], just drop default features:

[dependencies]
bit-set = { version = "0.8", default-features = false }

If you want to use serde with the alloc crate instead of std, just use the serde_no_std feature:

[dependencies]
bit-set = { version = "0.8", default-features = false, features = ["serde", "serde_no_std"] }

If you want borsh-rs support, include it like this:

[dependencies]
bit-set = { version = "0.8", features = ["borsh"] }

Other available serialization libraries can be enabled with the miniserde and nanoserde features.

An implementation of a set using a bit vector as an underlying representation for holding unsigned numerical elements.

It should also be noted that the amount of storage necessary for holding a set of objects is proportional to the maximum of the objects when viewed as a usize.

use bit_set::BitSet;

// It's a regular set
let mut s = BitSet::new();
s.insert(0);
s.insert(3);
s.insert(7);

s.remove(7);

if !s.contains(7) {
    println!("There is no 7");
}

// Can initialize from a `BitVec`
let other = BitSet::from_bytes(&[0b11010000]);

s.union_with(&other);

// Print 0, 1, 3 in some order
for x in s.iter() {
    println!("{}", x);
}

// Can convert back to a `BitVec`
let bv = s.into_bit_vec();
assert!(bv[3]);

Dual-licensed for compatibility with the Rust project.

Licensed under the Apache License Version 2.0: http://www.apache.org/licenses/LICENSE-2.0, or the MIT license: http://opensource.org/licenses/MIT, at your option.