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Implement Index and IndexMut traits #98

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Implement Index and IndexMut traits #98

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25 changes: 23 additions & 2 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -157,10 +157,10 @@ use core::convert::TryInto;
use core::hash::*;
use core::iter::FromIterator;
use core::marker::PhantomData;
use core::ops::Bound;
use core::ops::{Bound, Index, IndexMut};
use core::ops::{Deref, DerefMut, RangeBounds};
use core::ptr::NonNull;
use core::slice::Iter;
use core::slice::{Iter, SliceIndex};
use core::{fmt, mem, ops, ptr, slice};

use impl_details::*;
Expand Down Expand Up @@ -2078,6 +2078,20 @@ impl<T> DerefMut for ThinVec<T> {
}
}

impl<T, I: SliceIndex<[T]>> Index<I> for ThinVec<T> {
type Output = <I as SliceIndex<[T]>>::Output;

fn index(&self, index: I) -> &Self::Output {
&self.deref()[index]
}
}

impl<T, I: SliceIndex<[T]>> IndexMut<I> for ThinVec<T> {
fn index_mut(&mut self, index: I) -> &mut Self::Output {
&mut self.deref_mut()[index]
}
}

impl<T> Borrow<[T]> for ThinVec<T> {
fn borrow(&self) -> &[T] {
self.as_slice()
Expand Down Expand Up @@ -4046,6 +4060,13 @@ mod std_tests {
assert!(vec[1] == 2);
}

#[test]
fn test_index_mut() {
let mut vec = thin_vec![1, 2, 3];
vec[1] = 22;
assert!(vec[1] == 22);
}

#[test]
#[should_panic]
fn test_index_out_of_bounds() {
Expand Down