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ndarray::ArrayViewMut::windows should produce mutable windows #1357
Description
Calling .windows() on an ndarray::ArrayViewMut should return mutable windows. That's very useful when, for example, you iterate over a partition of an interval and the quantities you compute affect values living on both ends of the interval.
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bluss commentedon Feb 5, 2024
That's not possible by lifetime rules in Rust - the iterator's elements are simultaneously valid, and since they are windows, they partially overlap, which is not allowed for mutable references.
We'll need to update the issue with a plan for a way to get the intended effect in a way we can implement.
akern40 commentedon Oct 24, 2024
There is a pattern known as "lending iterators" which allow things like
windows_mut. See this article by Niko Matsakis for the general concept, and these crates for implementations of that pattern. We could then support awindows_mutfunction that returns this kind of iterator.