CountMap

Implementation of a count map in Rust. A map that holds a counter as a value, that gets incremented each time the key is added to the map. This implementation simply decorates the HashMap from the Rust std library. To provide a generic counter (any number type should work) some traits from the num-traits crate are used.

Documentation

Usage

Add the following to your Cargo.toml:

[dependencies]
countmap = "0.2"

Next, add this to your crate root:

extern crate countmap;

Now you can use a count map in your code:

extern crate countmap;
use countmap::CountMap;

fn main() {
	let map: CountMap<_, u16> = CountMap::new();
	map.insert_or_increment("foo");
	map.insert_or_increment("foo");
	map.insert_or_increment("foo");
	assert_eq!(map.get_count(&"foo"), Some(3));
}

License

Countmap is licensed under either of the following, at your option:

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT License (LICENSE-MIT or http://opensource.org/licenses/MIT)