Re: [PATCH 1/2] rust: impl_flags: add conversion functions

[Andreas Hindborg <a.hindborg@kernel.org>]

Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> writes:

> On Sun, Feb 15, 2026 at 9:23 PM Andreas Hindborg <a.hindborg@kernel.org> wrote:
>>
>> +        impl ::core::convert::From<$flag> for $ty {
>> +            #[inline]
>> +            fn from(value: $flag) -> Self {
>> +                // SAFETY: All `$flag` values are valid for use as `$ty`.
>> +                unsafe { core::mem::transmute::<$flag, $ty>(value) }
>> +            }
>> +        }
>
> Why do we need the transmute instead of a cast? Did you notice a difference?

No, I did not think of using `as`. I can do that.

> Same in the other one -- why not constructing the object normally?

Will do.

> Also, you can use `Self` for `$ty` and `$flags` to make it easier to read.

Ok.

>
> In addition, I would suggest an early return with a simple `if`.

Ok.

>
> Finally, it wouldn't hurt adding a one-liner example for each at the top.

I'll add an example.


Best regards,
Andreas Hindborg