Make iterators covariant in element type - #1417
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bluss merged 2 commits intoAug 6, 2024
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August 6, 2024 10:06
The internal Baseiter type underlies most of the ndarray iterators, and it used `*mut A` for element type A. Update it to use `NonNull<A>` which behaves identically except it's guaranteed to be non-null and is covariant w.r.t the parameter A. Add compile test from the issue. Fixes #1290
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August 6, 2024 10:09
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src/impl_owned_array.rs
| // iter is a raw pointer iterator traversing the array in memory order now with the | ||
| // sorted axes. | ||
| let mut iter = Baseiter::new(self_.ptr.as_ptr(), self_.dim, self_.strides); | ||
| let mut iter = Baseiter::new(self_.ptr, self_.dim, self_.strides); |
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Review note: it's evident that Baseiter is constructed from a NonNull everywhere, which means that its non-null requirement is easily fulfilled.
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Complete the transition to using NonNull as the raw pointer type by using it as Baseiter's iterator element type.
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August 6, 2024 10:32
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The internal Baseiter type underlies most of the ndarray iterators, and it used *mut A for element type A. Update it to use NonNull<A> which behaves identically except it's guaranteed to be non-null and is covariant w.r.t the parameter A.
Add compile test from the issue.
The second commit continues the "conversion", using NonNull more consistently
in Baseiter's Iterator impl.
Fixes #1290