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Add link to GridRefIter example #2633

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Feb 7, 2025
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Add link to GridRefIter example #2633

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Add link to `GridRefIter` example
randomPoison Feb 7, 2025
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Improve playground code
randomPoison Feb 7, 2025
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7 changes: 5 additions & 2 deletions src/iterators/intoiterator.md
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Expand Up @@ -76,12 +76,15 @@ The example iterates over all combinations of x and y coordinates.
Try iterating over the grid twice in `main`. Why does this fail? Note that
`IntoIterator::into_iter` takes ownership of `self`.

Fix this issue by implementing `IntoIterator` for `&Grid` and storing a
reference to the `Grid` in `GridIter`.
Fix this issue by implementing `IntoIterator` for `&Grid` and creating a
`GridRefIter` that iterates by reference. A version with both `GridIter` and
`GridRefIter` is available [in this playground][1].

The same problem can occur for standard library types: `for e in some_vector`
will take ownership of `some_vector` and iterate over owned elements from that
vector. Use `for e in &some_vector` instead, to iterate over references to
elements of `some_vector`.

</details>

[1]: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=947e371c7295af758504f01f149023a1