std::iter: document iteration over &T and &mut T
#79360
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A colleague of mine is new to Rust, and mentioned that it was “slightly
confusing” to figure out what `&mut` does in iterating over `&mut foo`:
```rust
for value in &mut self.my_vec {
// ...
}
```
My colleague had read the `std::iter` docs and not found the answer
there. There is a brief section at the top about “the three forms of
iteration”, which mentions `iter_mut`, but it doesn’t cover the purpose
of `&mut coll` for a collection `coll`. This patch adds an explanatory
section to the docs. I opted to create a new section so that it can
appear after the note that `impl<I: Iterator> IntoIterator for I`, and
it’s nice for the existing “three forms of iteration” to appear near the
top.
Implementation note: I haven’t linkified the references to `HashSet` and
`HashMap`, since those are in `std` and these docs are in `core`;
linkifying them gave an “unresolved link” rustdoc error.
Test Plan:
Ran `./x.py doc library/core`, and the result looked good. Manually
copy-pasted the two doctests into the playground and ran them.
wchargin-branch: doc-iter-by-reference
wchargin-source: 0f35369a8a735868621166608797744e97536792
|
(rust_highfive has picked a reviewer for you, use r? to override) |
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@rustbot modify labels +T-doc |
rustbot
added
the
A-docs
camelid
added
A-iterators
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This seems good! |
jyn514
reviewed
Nov 23, 2020
wchargin-branch: doc-iter-by-reference wchargin-source: e4069ac9a9d73860467cea74cf3ae1605af37d74
crlf0710
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r? @KodrAus |
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This is great, thanks! @bors r+ rollup |
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📌 Commit 6edc90a has been approved by |
bors
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@wchargin Btw, I don't think you should worry about testing manually! CI should run the equivalent for you. |
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Dec 12, 2020
…ence, r=m-ou-se
std::iter: document iteration over `&T` and `&mut T`
A colleague of mine is new to Rust, and mentioned that it was “slightly
confusing” to figure out what `&mut` does in iterating over `&mut foo`:
```rust
for value in &mut self.my_vec {
// ...
}
```
My colleague had read the `std::iter` docs and not found the answer
there. There is a brief section at the top about “the three forms of
iteration”, which mentions `iter_mut`, but it doesn’t cover the purpose
of `&mut coll` for a collection `coll`. This patch adds an explanatory
section to the docs. I opted to create a new section so that it can
appear after the note that `impl<I: Iterator> IntoIterator for I`, and
it’s nice for the existing “three forms of iteration” to appear near the
top.
Test Plan:
Ran `./x.py doc library/core`, and the result looked good, including
links. Manually copy-pasted the two doctests into the playground and ran
them.
wchargin-branch: doc-iter-by-reference
bors
added a commit
to rust-lang-ci/rust
that referenced
this pull request
Dec 13, 2020
Rollup of 12 pull requests Successful merges: - rust-lang#79360 (std::iter: document iteration over `&T` and `&mut T`) - rust-lang#79398 (Link loop/for keyword) - rust-lang#79834 (Remove deprecated linked_list_extras methods.) - rust-lang#79845 (Fix rustup support in default_build_triple for python3) - rust-lang#79940 (fix more clippy::complexity findings) - rust-lang#79942 (Add post-init hook for static memory for miri.) - rust-lang#79954 (Fix building compiler docs with stage 0) - rust-lang#79963 (Fix typo in `DebruijnIndex` documentation) - rust-lang#79970 (Misc rustbuild improvements when the LLVM backend isn't used) - rust-lang#79973 (rustdoc light theme: Fix CSS for selected buttons) - rust-lang#79984 (Remove an unused dependency that made `rustdoc` crash) - rust-lang#79985 (Fixes submit event of the search input) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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A colleague of mine is new to Rust, and mentioned that it was “slightly
confusing” to figure out what
&mutdoes in iterating over&mut foo:My colleague had read the
std::iterdocs and not found the answerthere. There is a brief section at the top about “the three forms of
iteration”, which mentions
iter_mut, but it doesn’t cover the purposeof
&mut collfor a collectioncoll. This patch adds an explanatorysection to the docs. I opted to create a new section so that it can
appear after the note that
impl<I: Iterator> IntoIterator for I, andit’s nice for the existing “three forms of iteration” to appear near the
top.
Test Plan:
Ran
./x.py doc library/core, and the result looked good, includinglinks. Manually copy-pasted the two doctests into the playground and ran
them.
wchargin-branch: doc-iter-by-reference