Generics over the size of an array type

photino · 2015-10-28T04:40:13.815Z

Currently, we can only implement a trait for [T; N] where N is a non-negative compile time constant size. What are the difficulties in supporting generics over the size of an array type? Any ideas or plans for this? Perhaps, we need an extension like impl<T> Trait for [T; N: usize].

sorear · 2015-10-28T04:47:13.313Z

It’s a well-known rough spot. This looks like the main discussion thread:

github.com/rust-lang/rfcs

Issue: Parameterize types over numerics / type level integers

opened by brson on 2015-04-06

This is a postponement issue tracking postponed RFCs in the general area of "functions generic over a constant" or "generic constants"...

T-lang

llogiq · 2015-10-28T05:32:31.983Z

There is generic-array which implements this in a third-party crate.

bluss · 2015-10-28T21:22:20.460Z

There is the unstable trait FixedSizeArray, but it’s not likely to be the final solution.

system · 2019-03-25T08:25:24.174Z

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