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README
generic-array
This crate implements generic array types for Rust.
Requires minumum Rust version of 1.36.0, or 1.41.0 for From<[T; N]> implementations
Usage
The Rust arrays [T; N] are problematic in that they can't be used generically with respect to N, so for example this won't work:
struct Foo<N> {
data: [i32; N]
}
generic-array defines a new trait ArrayLength<T> and a struct GenericArray<T, N: ArrayLength<T>>, which let the above be implemented as:
struct Foo<N: ArrayLength<i32>> {
data: GenericArray<i32, N>
}
The ArrayLength<T> trait is implemented by default for unsigned integer types from typenum crate:
use generic_array::typenum::U5;
struct Foo<N: ArrayLength<i32>> {
data: GenericArray<i32, N>
}
fn main() {
let foo = Foo::<U5>{data: GenericArray::default()};
}
For example, GenericArray<T, U5> would work almost like [T; 5]:
use generic_array::typenum::U5;
struct Foo<T, N: ArrayLength<T>> {
data: GenericArray<T, N>
}
fn main() {
let foo = Foo::<i32, U5>{data: GenericArray::default()};
}
In version 0.1.1 an arr! macro was introduced, allowing for creation of arrays as shown below:
let array = arr![u32; 1, 2, 3];
assert_eq!(array[2], 3);