70 lines
1.4 KiB
Rust
70 lines
1.4 KiB
Rust
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// build-pass
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#![allow(incomplete_features)]
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#![feature(generic_const_exprs)]
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use std::{marker::PhantomData, ops::Mul};
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pub enum Nil {}
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pub struct Cons<T, L> {
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_phantom: PhantomData<(T, L)>,
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}
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pub trait Indices<const N: usize> {
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const RANK: usize;
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const NUM_ELEMS: usize;
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}
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impl<const N: usize> Indices<N> for Nil {
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const RANK: usize = 0;
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const NUM_ELEMS: usize = 1;
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}
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impl<T, I: Indices<N>, const N: usize> Indices<N> for Cons<T, I> {
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const RANK: usize = I::RANK + 1;
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const NUM_ELEMS: usize = I::NUM_ELEMS * N;
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}
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pub trait Concat<J> {
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type Output;
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}
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impl<J> Concat<J> for Nil {
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type Output = J;
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}
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impl<T, I, J> Concat<J> for Cons<T, I>
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where
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I: Concat<J>,
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{
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type Output = Cons<T, <I as Concat<J>>::Output>;
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}
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pub struct Tensor<I: Indices<N>, const N: usize>
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where
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[u8; I::NUM_ELEMS]: Sized,
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{
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pub data: [u8; I::NUM_ELEMS],
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_phantom: PhantomData<I>,
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}
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impl<I: Indices<N>, J: Indices<N>, const N: usize> Mul<Tensor<J, N>> for Tensor<I, N>
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where
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I: Concat<J>,
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<I as Concat<J>>::Output: Indices<N>,
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[u8; I::NUM_ELEMS]: Sized,
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[u8; J::NUM_ELEMS]: Sized,
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[u8; <I as Concat<J>>::Output::NUM_ELEMS]: Sized,
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{
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type Output = Tensor<<I as Concat<J>>::Output, N>;
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fn mul(self, _rhs: Tensor<J, N>) -> Self::Output {
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Tensor {
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data: [0u8; <I as Concat<J>>::Output::NUM_ELEMS],
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_phantom: PhantomData,
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}
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}
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}
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fn main() {}
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