nummap

Defines a wrapper around a HashMap of number values which behaves as if ALL keys are mapped but 0 values are not stored.

lib.rs:

Defines the [NumMap] struct which acts as if all unmapped keys have a value of 0.

let mut map = map![(1, 2), (3, 4)];

//We have set no mapping but we still get 0.
assert_eq!(map.get(&0,), 0,);

//We didn't set a mapping here either but we still get 0.
assert_eq!(map.set(0, 10,), 0,);
assert_eq!(map.get(&0,), 10,);

Since all keys are considered mapped arithmetic is implemented on values.

let map = map![(1, 2), (3, 4)] + map![(1, 4), (3, 2)];

assert_eq!(map, map![(1, 3), (3, 3)] * 2,);

Author --- daniel.bechaz@gmail.com
Last Moddified --- 2020-01-06