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rust: implement PointerWrapper for unit type. #584

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Merged
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Dec 2, 2021
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rust: implement PointerWrapper for unit type. #584

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13 changes: 13 additions & 0 deletions rust/kernel/types.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -144,6 +144,19 @@ impl<T> PointerWrapper for *mut T {
}
}

impl PointerWrapper for () {
type Borrowed<'a> = ();

fn into_pointer(self) -> *const c_types::c_void {
// We use 1 to be different from a null pointer.
1usize as _
}

unsafe fn borrow<'a>(_: *const c_types::c_void) -> Self::Borrowed<'a> {}

unsafe fn from_pointer(_: *const c_types::c_void) -> Self {}
}

/// Runs a cleanup function/closure when dropped.
///
/// The [`ScopeGuard::dismiss`] function prevents the cleanup function from running.
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