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Improve std::hash docs - #41125
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Part of #29357. * split summary and explanation more clearly * added link to nomicon for "zero-sized" * "does not need construction" -> say how it can be created, and that it doesn't need to be done with `HashMap` or `HashSet`
Part of #29357. * split summary and explanation more clearly, while expanding the explanation to make the reason for `BuildHasher` existing more clear * added an example illustrating that `Hasher`s created by one `BuildHasher` should be identical * added links * repeated the fact that hashers produced should be identical in `build_hasher`s method docs
Part of #29357. * merged "Derivable" and "How can I implement `Hash`?" sections into one "Implementing `Hash`" section to aid coherency * added an example for `#[derive(Hash)]` * moved part about relation between `Hash` and `Eq` into a new "`Hash` and `Eq`" section; changed wording to be more consistent with `HashMap` and `HashSet`'s * explicitly mentioned `#[derive(PartialEq, Eq, Hash)]` in the new section * changed method summaries for consistency, adding links and examples
Part of #29357. * rephrased summary sentences to be less redundant * expanded top-level docs, adding a usage example and links to relevant methods (`finish`, `write` etc) as well as `Hash` * added examples to the `finish` and `write` methods
chordowl
commented
Apr 7, 2017
| /// assert_eq!(hasher_1.finish(), hasher_2.finish()); | ||
| /// ``` | ||
| /// | ||
| /// [`build_hasher`]: #method.build_hasher |
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This needs to link to #tymethod.build_hasher (I forgot to run linkchecker locally >_>)
steveklabnik
commented
Apr 7, 2017
Contributor
/cc @rust-lang/docs |
| /// #[derive(Hash)] | ||
| /// struct Rustacean { | ||
| /// name: String, | ||
| /// country: String, |
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We tend to use four spaces for indentation.
| /// | ||
| /// If you need more control over how a value is hashed, you need to implement | ||
| /// the `Hash` trait: | ||
| /// If you need more control over how a value is hash, you can of course |
chordowl
commented
Apr 10, 2017
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I have addressed the broken link as well as the indent and grammar slipups that were brought up. Since I personally have barely any idea on how to act on the issues I outline in the initial comment, and as they weren't on the list on the issue anyway, I've decided not to address them within this PR (unless that is a dealbreaker for someone 😅). |
frewsxcv
commented
Apr 15, 2017
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This is great @lukaramu, thanks so much for this! 🎉 @bors r+ rollup |
bors
commented
Apr 15, 2017
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📌 Commit 12d7c3d has been approved by |
bors
commented
Apr 15, 2017
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⌛ Testing commit 12d7c3d with merge 6874b74... |
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Apr 15, 2017
Improve std::hash docs Fixesrust-lang#29357. For details on what exactly I've done, see the commit descriptions. There are some things I'm not sure about, but would like to address before merging this so the issue can be closed; any feedback on these points would really be appriciated: * [x] ~I didn't touch the module level docs at all. On the one hand, I think they could use a short overview over the module; on the other hand, the module really isn't that big and I don't know if I could really do anything beyond just duplicating the type's summaries...~ * [x] ~I feel like the module-level examples are quite long-winded and not to the point, but I couldn't really think of anything better. Any ideas?~ * [x] ~Should `Hasher` get an example for implementing it? There is one in the module documentation, but it only "implements" it via `unimplemented!` and I'm not sure what the value of that is.~ * [x] ~Should `Hasher`'s `write_{int}` methods get examples?~ If there's anything else you'd like to see in std::hash's docs, please let me know! r? @rust-lang/docs
frewsxcv
commented
Apr 15, 2017
Contributor
@bors retry prioritizing rollup |
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Fixes#29357.
For details on what exactly I've done, see the commit descriptions.
There are some things I'm not sure about, but would like to address before merging this so the issue can be closed; any feedback on these points would really be appriciated:
I didn't touch the module level docs at all. On the one hand, I think they could use a short overview over the module; on the other hand, the module really isn't that big and I don't know if I could really do anything beyond just duplicating the type's summaries...I feel like the module-level examples are quite long-winded and not to the point, but I couldn't really think of anything better. Any ideas?ShouldHasherget an example for implementing it? There is one in the module documentation, but it only "implements" it viaunimplemented!and I'm not sure what the value of that is.ShouldHasher'swrite_{int}methods get examples?If there's anything else you'd like to see in std::hash's docs, please let me know!
r? @rust-lang/docs