Add an example for deriving PartialOrd on enums #88202
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For some reason, I always forget which variants are smaller and which are larger when you derive PartialOrd on an enum. And the wording in the current docs is not entirely clear to me. So, I often end up making a small enum, deriving PartialOrd on it, and then writing a `#[test]` with an assert that the top one is smaller than the bottom one (or the other way around) to figure out which way the deriving goes. So then I figured, it would be great if the standard library docs just had that example, so if I keep forgetting, at least I can figure it out quickly by looking at std's docs.
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Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @joshtriplett (or someone else) soon. Please see the contribution instructions for more information. |
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@joshtriplett could this have a look? Thank you. |
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@bors r+ rollup |
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📌 Commit 003a636 has been approved by |
m-ou-se
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Sep 2, 2021
Add an example for deriving PartialOrd on enums For some reason, I always forget which variants are smaller and which are larger when you derive PartialOrd on an enum. And the wording in the current docs is not entirely clear to me. So, I often end up making a small enum, deriving PartialOrd on it, and then writing a `#[test]` with an assert that the top one is smaller than the bottom one (or the other way around) to figure out which way the deriving goes. So then I figured, it would be great if the standard library docs just had that example, so if I keep forgetting, at least I can figure it out quickly by looking at std's docs.
bors
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Sep 3, 2021
Rollup of 7 pull requests Successful merges: - rust-lang#88202 (Add an example for deriving PartialOrd on enums) - rust-lang#88483 (Fix LLVM libunwind build for non-musl targets) - rust-lang#88507 (Add test case for using `slice::fill` with MaybeUninit) - rust-lang#88557 (small const generics cleanup) - rust-lang#88579 (remove redundant / misplaced sentence from docs) - rust-lang#88610 (Update outdated docs of array::IntoIter::new.) - rust-lang#88613 (Update primitive docs for rust 2021.) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
matthiaskrgr
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Jan 17, 2022
…lnay Copy an example to PartialOrd as well In rust-lang#88202 I added an example for deriving PartialOrd on enums, but only later did I realize that I actually put the example on Ord. This copies the example to PartialOrd as well, which is where I intended for it to be. We could also delete the example on Ord, but I see there's already some highly similar examples shared between Ord and PartialOrd, so I figured we could leave it. I also changed some type annotations in an example from `x : T` to the more common style (in Rust) of `x: T`.
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For some reason, I always forget which variants are smaller and which
are larger when you derive PartialOrd on an enum. And the wording in the
current docs is not entirely clear to me.
So, I often end up making a small enum, deriving PartialOrd on it, and
then writing a
#[test]with an assert that the top one is smaller thanthe bottom one (or the other way around) to figure out which way the
deriving goes.
So then I figured, it would be great if the standard library docs just
had that example, so if I keep forgetting, at least I can figure it out
quickly by looking at std's docs.