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CDirkx opened this issue Aug 30, 2020 · 2 comments
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Tracking issue for const Ordering methods #76113

CDirkx opened this issue Aug 30, 2020 · 2 comments
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A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) B-unstable Blocker: Implemented in the nightly compiler and unstable. C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.

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@CDirkx
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CDirkx commented Aug 30, 2020

Constify methods of core::cmp::Ordering under feature const_ordering.

Current methods made const:

  • reverse
  • then

Tracking issue for const fn: #57563.
@CDirkx CDirkx mentioned this issue Aug 30, 2020
Merged
@jonas-schievink jonas-schievink added A-const-fn B-unstable Blocker: Implemented in the nightly compiler and unstable. C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC labels Aug 30, 2020
Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this issue Aug 31, 2020
@Dylan-DPC
Rollup merge of rust-lang#75463 - CDirkx:ordering-const, r=CDirkx
8af7b00 
Make some Ordering methods const

Constify the following methods of `core::cmp::Ordering`:
 - `reverse`
 - `then`

Possible because of rust-lang#49146 (Allow `if` and `match` in constants).

Tracking issue:  rust-lang#76113
bors added a commit to rust-lang-ci/rust that referenced this issue Aug 31, 2020
@bors
Auto merge of rust-lang#75463 - CDirkx:ordering-const, r=CDirkx
92290d1 
Make some Ordering methods const

Constify the following methods of `core::cmp::Ordering`:
 - `reverse`
 - `then`

Possible because of rust-lang#49146 (Allow `if` and `match` in constants).

Tracking issue:  rust-lang#76113
@CDirkx CDirkx mentioned this issue Sep 2, 2020
Merged
Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this issue Sep 15, 2020
@Dylan-DPC
Rollup merge of rust-lang#76198 - CDirkx:const-ordering, r=dtolnay
69ac076 
Make some Ordering methods const

Resubmission of [PR#75463](rust-lang#75463) as per [PR#76172](rust-lang#76172).

Constify the following methods of `core::cmp::Ordering`:
 - `reverse`
 - `then`

Insta-stabilizes these methods as const under the `const_ordering` feature, as their implementation is a trivial match and the recent stabilization of rust-lang#49146 (Allow `if` and `match` in constants).
Note: the `const_ordering` feature has never actually been used as these methods have not been `#[rustc_const_unstable]`.

Tracking issue:  rust-lang#76113
@pnkfelix pnkfelix added the T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. label Oct 14, 2022
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pnkfelix commented Oct 14, 2022 •
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Visiting for T-compiler steering backlog bonanza

Its not totally clear what this issue is meant to be tracking.

The description lists a pair of methods that were already made const in #75463.

We suspect the intent is to track the constification of the remainder of the Ordering methods that can be made const, but there's no clear specification of what the work items there are.

@rustbot label: S-tracking-need-summary

@CDirkx
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CDirkx commented Oct 17, 2022 •
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This issue was originally created as a tracking issue for constifying reverse and then under the feature const_ordering. However, these methods were insta-const-stabilized, skipping rustc_const_unstable(feature = "const_ordering", issue = "76113"). This issue has thus never actually been referenced in the Rust codebase.

I agree that constifying the remainder of Ordering is a good idea, but not something I myself can work on right now. I could therefore close this issue for now, and if someone else starts working on further constification a new tracking issue could be opened.

@oli-obk oli-obk closed this as completed Oct 17, 2022
@RalfJung RalfJung added the A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) label Dec 1, 2024
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A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) B-unstable Blocker: Implemented in the nightly compiler and unstable. C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
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