Update docs for str::as_bytes_mut.#74381
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Updated to reflect the change from #71033. Any suggestions for clearer or more precise wording are welcome.
* Add "Safety" section describing UTF-8 invariant. * Remove mention of `from_utf8_mut`. It is not necessary to call a function to convert the byte slice back to a string slice. The original string becomes accessible again after the byte slice is no longer used (as shown in the example code).
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@bors r+ rollup I think in theory we could relax even further -- e.g., calling this method on a non-UTF-8 str seems fine. But I think this is good enough for now and does not expand scope, so does not need T-libs/lang signoff. |
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Update docs for str::as_bytes_mut. * Add "Safety" section describing UTF-8 invariant. * Remove mention of `from_utf8_mut`. It is not necessary to call a function to convert the byte slice back to a string slice. The original string becomes accessible again after the byte slice is no longer used (as shown in the example code).
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…arth Rollup of 7 pull requests Successful merges: - rust-lang#73421 (Clarify effect of orphan rule changes on From/Into) - rust-lang#74037 (Update reference to CONTRIBUTING.md) - rust-lang#74203 (Enforce the static symbol order.) - rust-lang#74295 (Add and fix BTreeMap comments) - rust-lang#74352 (Use local links in the alloc docs.) - rust-lang#74377 (Move libstd's default feature to libtest) - rust-lang#74381 (Update docs for str::as_bytes_mut.) Failed merges: r? @ghost
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| /// # Safety | ||
| /// | ||
| /// The caller must ensure that the content of the slice is valid UTF-8 | ||
| /// before the borrow ends and the underlying `str` is used. |
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| /// before the borrow ends and the underlying `str` is used. | |
| /// before the borrow ends and the underlying `str` is used again. |
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| /// The caller must ensure that the content of the slice is valid UTF-8 | ||
| /// before the borrow ends and the underlying `str` is used. | ||
| /// | ||
| /// Use of a `str` whose contents are not valid UTF-8 is undefined behavior. |
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At some point we might want to be more clear about language-UB vs library-UB, but for now this wording seems fine to me.
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Add "Safety" section describing UTF-8 invariant.
Remove mention of
from_utf8_mut. It is not necessary to calla function to convert the byte slice back to a string slice. The
original string becomes accessible again after the byte slice is
no longer used (as shown in the example code).