threshold-dict

A data structure to find smallest key that is larger than the query.

Suppose we have a following weight dependent price table.

weight,price 100,10 200,15 500,30 otherwise,50

The price is decided by the smallest entry whose weight key is greater than the query.

examples

• weight=90 -> price=10
• weight=100 -> price=15
• weight=250 -> price=30
• weight=600 -> price=50

Install

sh cargo add threshold_dict

Usage

A ThresholdDict can be created by passing kv pairs and a default func. If query is greater than or equal to all of the keys, the default func is used.

```rust let kvpairs = vec![(100, 10), (200, 15), (500, 30)]; let tree: BTreeMap = kvpairs.intoiter().collect(); let defaultfunc = Box::new(|: &u32| Some(50)); let dict = ThresholdDict::withdefaultfunc(tree, defaultfunc);

assert_eq!(dict.query(&90), Some(10)); ```