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Constify cmp_min_max_by. #102245

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merged 1 commit into from
Sep 25, 2022
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Constify cmp_min_max_by. #102245

merged 1 commit into from
Sep 25, 2022

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onestacked
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@onestacked onestacked commented Sep 24, 2022 •
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Constifies core::cmp::{min, max}_by[_key] behind the const_cmp #92391 feature gate, using const_closure.

@rustbot rustbot added the T-libs Relevant to the library team, which will review and decide on the PR/issue. label Sep 24, 2022
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rustbot commented Sep 24, 2022

Hey! It looks like you've submitted a new PR for the library teams!

If this PR contains changes to any rust-lang/rust public library APIs then please comment with @rustbot label +T-libs-api -T-libs to tag it appropriately. If this PR contains changes to any unstable APIs please edit the PR description to add a link to the relevant API Change Proposal or create one if you haven't already. If you're unsure where your change falls no worries, just leave it as is and the reviewer will take a look and make a decision to forward on if necessary.

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r? @scottmcm

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Sep 24, 2022
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r? @fee1-dead

@rust-highfive rust-highfive assigned fee1-dead and unassigned scottmcm Sep 24, 2022
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@rustbot label +T-libs-api -T-libs

@rustbot rustbot added T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. and removed T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Sep 24, 2022
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@bors r+

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bors commented Sep 25, 2022

📌 Commit 2e7a201 has been approved by fee1-dead

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Sep 25, 2022
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bors added a commit to rust-lang-ci/rust that referenced this pull request Sep 25, 2022
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Auto merge of rust-lang#102265 - fee1-dead-contrib:rollup-a7fccbg, r=…
17e8752 
…fee1-dead

Rollup of 8 pull requests

Successful merges:

 - rust-lang#98111 (Clarify `[T]::select_nth_unstable*` return values)
 - rust-lang#101431 (Look at move place's type when suggesting mutable reborrow)
 - rust-lang#101800 (Constify slice.split_at_mut(_unchecked))
 - rust-lang#101997 (Remove support for legacy PM)
 - rust-lang#102194 (Note the type when unable to drop values in compile time)
 - rust-lang#102200 (Constify Default impl's for Arrays and Tuples.)
 - rust-lang#102245 (Constify cmp_min_max_by.)
 - rust-lang#102259 (Type-annotate and simplify documentation of Option::unwrap_or_default)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit b00b918 into rust-lang:master Sep 25, 2022
@rustbot rustbot added this to the 1.66.0 milestone Sep 25, 2022
fee1-dead
fee1-dead reviewed Sep 27, 2022
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library/core/src/cmp.rs
pub const fn min_by<T, F: ~const FnOnce(&T, &T) -> Ordering>(v1: T, v2: T, compare: F) -> T
where
T: ~const Destruct,
F: ~const Destruct,
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I don't think F needs to be dropped here.

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Ohh right thats an FnOnce, will fix

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I am fixing this in the const iterator PR.

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Ok thanks!

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@rustbot label +const-hack

@onestacked onestacked deleted the const_cmp_by branch November 2, 2022 22:42
@cuviper cuviper mentioned this pull request Mar 23, 2023
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@oli-obk oli-obk mentioned this pull request Mar 31, 2023
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bors added a commit to rust-lang-ci/rust that referenced this pull request Mar 31, 2023
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Auto merge of rust-lang#109817 - oli-obk:revert_102245, r=pnkfelix
734f69d 
Revert 102245

reverts rust-lang#102245, but only on beta, as that caused rust-lang#109543 which has since been fixed on nightly.

This needed an additional partial revert of rust-lang@5b08c9f for changes that happened due to later cleanups.

I also added a test from the issue to make sure this actually fixes it 😆

r? `@wesleywiser` `@pnkfelix`
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