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feat: ZeroableInOption and PodInOption traits (#114)

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* same as Zeroable and Pod but for types which are Zeroable and Pod when
  wrapped in Option
* allows downstream users to implement Zeroable and Pod for their own
  Option<T> types without running into orphan rules
This commit is contained in:
Edward 2022-06-29 01:54:56 +02:00 committed by GitHub
parent e9eb13e0e7
commit e8cd71df54
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 42 additions and 26 deletions
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34
src/pod.rs
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@ -52,25 +52,33 @@ unsafe impl Pod for f32 {}
unsafe impl Pod for f64 {}
unsafe impl<T: Pod> Pod for Wrapping<T> {}
unsafe impl Pod for Option<NonZeroI8> {}
unsafe impl Pod for Option<NonZeroI16> {}
unsafe impl Pod for Option<NonZeroI32> {}
unsafe impl Pod for Option<NonZeroI64> {}
unsafe impl Pod for Option<NonZeroI128> {}
unsafe impl Pod for Option<NonZeroIsize> {}
unsafe impl Pod for Option<NonZeroU8> {}
unsafe impl Pod for Option<NonZeroU16> {}
unsafe impl Pod for Option<NonZeroU32> {}
unsafe impl Pod for Option<NonZeroU64> {}
unsafe impl Pod for Option<NonZeroU128> {}
unsafe impl Pod for Option<NonZeroUsize> {}
/// Trait for types which are [Pod](Pod) when wrapped in [Option](core::option::Option).
///
/// ## Safety
///
/// * `Option<T>` must uphold the same invariants as [Pod](Pod).
pub unsafe trait PodInOption: ZeroableInOption + Copy + 'static {}
unsafe impl<T: PodInOption> Pod for Option<T> {}
unsafe impl PodInOption for NonZeroI8 {}
unsafe impl PodInOption for NonZeroI16 {}
unsafe impl PodInOption for NonZeroI32 {}
unsafe impl PodInOption for NonZeroI64 {}
unsafe impl PodInOption for NonZeroI128 {}
unsafe impl PodInOption for NonZeroIsize {}
unsafe impl PodInOption for NonZeroU8 {}
unsafe impl PodInOption for NonZeroU16 {}
unsafe impl PodInOption for NonZeroU32 {}
unsafe impl PodInOption for NonZeroU64 {}
unsafe impl PodInOption for NonZeroU128 {}
unsafe impl PodInOption for NonZeroUsize {}
#[cfg(feature = "unsound_ptr_pod_impl")]
unsafe impl<T: 'static> Pod for *mut T {}
#[cfg(feature = "unsound_ptr_pod_impl")]
unsafe impl<T: 'static> Pod for *const T {}
#[cfg(feature = "unsound_ptr_pod_impl")]
unsafe impl<T: 'static> Pod for Option<NonNull<T>> {}
unsafe impl<T: 'static> PodInOption for NonNull<T> {}
unsafe impl<T: Pod> Pod for PhantomData<T> {}
unsafe impl Pod for PhantomPinned {}

34
src/zeroable.rs
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@ -42,22 +42,30 @@ unsafe impl Zeroable for f32 {}
unsafe impl Zeroable for f64 {}
unsafe impl<T: Zeroable> Zeroable for Wrapping<T> {}
unsafe impl Zeroable for Option<NonZeroI8> {}
unsafe impl Zeroable for Option<NonZeroI16> {}
unsafe impl Zeroable for Option<NonZeroI32> {}
unsafe impl Zeroable for Option<NonZeroI64> {}
unsafe impl Zeroable for Option<NonZeroI128> {}
unsafe impl Zeroable for Option<NonZeroIsize> {}
unsafe impl Zeroable for Option<NonZeroU8> {}
unsafe impl Zeroable for Option<NonZeroU16> {}
unsafe impl Zeroable for Option<NonZeroU32> {}
unsafe impl Zeroable for Option<NonZeroU64> {}
unsafe impl Zeroable for Option<NonZeroU128> {}
unsafe impl Zeroable for Option<NonZeroUsize> {}
/// Trait for types which are [Zeroable](Zeroable) when wrapped in [Option](core::option::Option).
///
/// ## Safety
///
/// * `Option<T>` must uphold the same invariants as [Zeroable](Zeroable).
pub unsafe trait ZeroableInOption: Sized {}
unsafe impl<T: ZeroableInOption> Zeroable for Option<T> {}
unsafe impl ZeroableInOption for NonZeroI8 {}
unsafe impl ZeroableInOption for NonZeroI16 {}
unsafe impl ZeroableInOption for NonZeroI32 {}
unsafe impl ZeroableInOption for NonZeroI64 {}
unsafe impl ZeroableInOption for NonZeroI128 {}
unsafe impl ZeroableInOption for NonZeroIsize {}
unsafe impl ZeroableInOption for NonZeroU8 {}
unsafe impl ZeroableInOption for NonZeroU16 {}
unsafe impl ZeroableInOption for NonZeroU32 {}
unsafe impl ZeroableInOption for NonZeroU64 {}
unsafe impl ZeroableInOption for NonZeroU128 {}
unsafe impl ZeroableInOption for NonZeroUsize {}
unsafe impl<T> Zeroable for *mut T {}
unsafe impl<T> Zeroable for *const T {}
unsafe impl<T> Zeroable for Option<NonNull<T>> {}
unsafe impl<T> ZeroableInOption for NonNull<T> {}
unsafe impl<T: Zeroable> Zeroable for PhantomData<T> {}
unsafe impl Zeroable for PhantomPinned {}
unsafe impl<T: Zeroable> Zeroable for ManuallyDrop<T> {}