bjoernager/rust
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Implement Index[Mut] for arrays

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Adds implementations of `Index` and `IndexMut` for arrays that simply forward to the slice indexing implementation.
This commit is contained in:
pubfnbar 2020-07-31 23:19:10 +03:00 • committed by Mark Rousskov
parent 0468845924
commit c03dfa6671
1 changed files with 25 additions and 0 deletions
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25
library/core/src/array/mod.rs
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@ -12,6 +12,7 @@ use crate::convert::{Infallible, TryFrom};
use crate::fmt;
use crate::hash::{self, Hash};
use crate::marker::Unsize;
use crate::ops::{Index, IndexMut};
use crate::slice::{Iter, IterMut};
mod iter;
@ -208,6 +209,30 @@ impl<'a, T, const N: usize> IntoIterator for &'a mut [T; N] {
}
}
#[stable(feature = "index_trait_on_arrays", since = "1.50.0")]
impl<T, I, const N: usize> Index<I> for [T; N]
where
[T]: Index<I>,
{
type Output = <[T] as Index<I>>::Output;
#[inline]
fn index(&self, index: I) -> &Self::Output {
Index::index(self as &[T], index)
}
}
#[stable(feature = "index_trait_on_arrays", since = "1.50.0")]
impl<T, I, const N: usize> IndexMut<I> for [T; N]
where
[T]: IndexMut<I>,
{
#[inline]
fn index_mut(&mut self, index: I) -> &mut Self::Output {
IndexMut::index_mut(self as &mut [T], index)
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<A, B, const N: usize> PartialEq<[B; N]> for [A; N]
where