no_std compatible Map and Set backed by arrays.
This crate will evolve as more const-generic features become available.
This is especially useful if you have a bare enum where you want to treat each key as a field
rust
use array_map::*;
#[repr(u8)]
#[derive(Indexable)]
enum DetectionType {
Person,
Vehicle,
Bicycle,
}
let thresholds = ArrayMap::<DetectionType, f32, {DetectionType::count()}>::from_closure(|dt| match dt {
DetectionType::Person => 0.8,
DetectionType::Vehicle => 0.9,
DetectionType::Bicycle => 0.7,
});
let person_threshold = thresholds[DetectionType::Person];
This can also be used to memoize some common computations.
(this is 2x as fast as doing the computation on aarch64)
rust
use array_map::*;
let u8_to_f32_cache = ArrayMap::<u8, f32, {u8::SIZE}>::from_closure(|u|f32::from(*u) / 255.0);
let bytes = vec![0_u8; 1024];
// take some bytes and convert them to f32
let floats = bytes.iter().copied().map(|b|u8_to_f32_cache[b]).collect::<Vec<_>>();