On Tue, 11 Feb 2025 16:57:36 +0100
Andreas Hindborg <a.hindb...@kernel.org> wrote:
> The `Index` implementation on `BStr` was lost when we switched `BStr` from
> a type alias of `[u8]` to a newtype. This patch adds back `Index` by
> implementing `Index` for `BStr` when `Index` would be implemented for
> `[u8]`.
>
> Signed-off-by: Andreas Hindborg <a.hindb...@kernel.org>
> ---
> rust/kernel/str.rs | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
> index 002dcddf7c768..1eb945bed77d6 100644
> --- a/rust/kernel/str.rs
> +++ b/rust/kernel/str.rs
> @@ -114,6 +114,17 @@ fn eq(&self, other: &Self) -> bool {
> }
> }
>
> +impl<Idx> Index<Idx> for BStr
> +where
> + Idx: core::slice::SliceIndex<[u8], Output = [u8]>,
I think I'd prefer
[T]: Index<Idx>,
here.
> +{
> + type Output = Self;
> +
> + fn index(&self, index: Idx) -> &Self::Output {
> + BStr::from_bytes(&self.0[index])
> + }
> +}
> +
> /// Creates a new [`BStr`] from a string literal.
> ///
> /// `b_str!` converts the supplied string literal to byte string, so
> non-ASCII
>
