The Frequency trait represents types that keep track of the observed counts of items. The BTreeMapFrequency type is a frequency counter backed by a BTreeMap.

Usage

Add frequency and frequency-btreemap to your Cargo.toml:

[dependencies] frequency = "^1.0.0" frequency-btreemap = "^1.0.0"

Import both Frequency and BTreeMapFrequency:

``` extern crate frequency; extern crate frequency_btreemap;

use frequency::Frequency; use frequency_btreemap::BTreeMapFrequency; ```