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roaring 0.10.11

A better compressed bitset - pure Rust implementation
Documentation 
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extern crate roaring;
use roaring::RoaringBitmap;

#[test]
fn array() {
    let bitmap = (0..2000).collect::<RoaringBitmap>();
    let mut iter = bitmap.iter();
    assert_eq!((2000, Some(2000)), iter.size_hint());
    iter.by_ref().take(1000).for_each(drop);
    assert_eq!((1000, Some(1000)), iter.size_hint());
    iter.by_ref().for_each(drop);
    assert_eq!((0, Some(0)), iter.size_hint());
}

#[test]
fn bitmap() {
    let bitmap = (0..6000).collect::<RoaringBitmap>();
    let mut iter = bitmap.iter();
    assert_eq!((6000, Some(6000)), iter.size_hint());
    iter.by_ref().take(3000).for_each(drop);
    assert_eq!((3000, Some(3000)), iter.size_hint());
    iter.by_ref().for_each(drop);
    assert_eq!((0, Some(0)), iter.size_hint());
}

#[test]
fn arrays() {
    let bitmap = (0..2000)
        .chain(1_000_000..1_002_000)
        .chain(2_000_000..2_001_000)
        .collect::<RoaringBitmap>();
    let mut iter = bitmap.iter();
    assert_eq!((5000, Some(5000)), iter.size_hint());
    iter.by_ref().take(3000).for_each(drop);
    assert_eq!((2000, Some(2000)), iter.size_hint());
    iter.by_ref().for_each(drop);
    assert_eq!((0, Some(0)), iter.size_hint());
}

#[test]
fn bitmaps() {
    let bitmap = (0..6000)
        .chain(1_000_000..1_012_000)
        .chain(2_000_000..2_010_000)
        .collect::<RoaringBitmap>();
    let mut iter = bitmap.iter();
    assert_eq!((28000, Some(28000)), iter.size_hint());
    iter.by_ref().take(2000).for_each(drop);
    assert_eq!((26000, Some(26000)), iter.size_hint());
    iter.by_ref().take(5000).for_each(drop);
    assert_eq!((21000, Some(21000)), iter.size_hint());
    iter.by_ref().take(20000).for_each(drop);
    assert_eq!((1000, Some(1000)), iter.size_hint());
    iter.by_ref().for_each(drop);
    assert_eq!((0, Some(0)), iter.size_hint());
}