This crate implements generic array types for Rust.
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:
rust
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:
rust
struct Foo<N: ArrayLength<i32>> {
data: GenericArray<i32, N>
}
To actually define a type implementing ArrayLength, you can use two types _0 and _1 grouped in tuples to form a binary representation, e.g.:
type _5 = ((_1, _0), _1);
Then you can use GenericArray<T, _5> almost like you would use [T; 5] :)