## threshold

Threshold data structures

### 48 releases

 0.9.1 Mar 14, 2021 Mar 13, 2021 Aug 20, 2020 Jul 19, 2020 Aug 14, 2019

#1035 in Data structures

MIT/Apache

120KB
2K SLoC

### `threshold-rs`: threshold data structures in Rust!

#### Example

Assume multiset `X` is `{10: 1, 8: 2, 6: 3, 5: 1}`. This means that event `10` was seen once, event `8` twice, and so on.

Assume that these events come from vector clocks, and thus seeing event 10 means seeing all events from 1 to 10.

If, for example, we want the event that was seen at least 4 times (i.e. our threshold is 4), we should get event `6`.

Assume `threshold(u64, X) -> Option<u64>` where the first argument is the threshold desired and the output the event that passes the threshold (in case there's one). Then:

• `threshold(1, X) = Some(10)`
• `threshold(2, X) = Some(8)`
• `threshold(3, X) = Some(8)`
• `threshold(4, X) = Some(6)`
• `threshold(7, X) = Some(5)`
• `threshold(8, X) = None`

#### Code Example

``````use threshold::{clock, *};

let vclock_0 = clock::vclock_from_seqs(vec![10, 5, 5]);
let vclock_1 = clock::vclock_from_seqs(vec![8, 10, 6]);
let vclock_2 = clock::vclock_from_seqs(vec![9, 8, 7]);

let mut tclock = TClock::new();

let vclock_t1 = clock::vclock_from_seqs(vec![10, 10, 7]);
let vclock_t2 = clock::vclock_from_seqs(vec![9, 8, 6]);
let vclock_t3 = clock::vclock_from_seqs(vec![8, 5, 5]);

assert_eq!(tclock.threshold_union(1), vclock_t1);
assert_eq!(tclock.threshold_union(2), vclock_t2);
assert_eq!(tclock.threshold_union(3), vclock_t3);
``````