Implement Eq/Hash/Debug etc. for unsized tuples. #43011
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
|
r? @sfackler |
Mark-Simulacrum
added
the
S-waiting-on-review
sfackler
added
the
T-libs-api
|
No RFC is needed, or a feature - trait implementations can't actually have feature gates applied to them. @rfcbot fcp merge |
rfcbot
added
the
proposed-final-comment-period
|
Team member @sfackler has proposed to merge this. The next step is review by the rest of the tagged teams: No concerns currently listed. Once these reviewers reach consensus, this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up! See this document for info about what commands tagged team members can give me. |
|
ping @brson, you're the last checkbox needed here! |
|
@bors: r+ rollup |
|
📌 Commit 728d26c has been approved by |
arielb1
added
S-waiting-on-bors
Mark-Simulacrum
added a commit
to Mark-Simulacrum/rust
that referenced
this pull request
Jul 12, 2017
Implement Eq/Hash/Debug etc. for unsized tuples. As I mentioned in [the comment in rust-lang#18469](rust-lang#18469 (comment)), the implementations of `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` can be generalized to unsized tuples. This is consistent with the `derive` behavior for unsized structs. ```rust #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug, Default, Hash)] struct MyTuple<X, Y, Z: ?Sized>(X, Y, Z); fn f(x: &MyTuple<i32, i32, [i32]>) { x == x; x < x; println!("{:?}", x); } ``` Questions: - Need an RFC? - Need a feature gate? I don't think it does because the unsized tuple coercion rust-lang#42527 is feature-gated. - I changed `builder.field($name);` into `builder.field(&$name);` in the `Debug` implementation to pass compilation. This won't affect the behavior because `Debug for &'a T` is a mere redirection to `Debug for T`. However, I don't know if it affects code size / performance.
bors
added a commit
that referenced
this pull request
Jul 12, 2017
rfcbot
removed
the
proposed-final-comment-period
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
As I mentioned in the comment in #18469, the implementations of
PartialEq,Eq,PartialOrd,Ord,Debug,Hashcan be generalized to unsized tuples.This is consistent with the
derivebehavior for unsized structs.Questions:
builder.field($name);intobuilder.field(&$name);in theDebugimplementation to pass compilation. This won't affect the behavior becauseDebug for &'a Tis a mere redirection toDebug for T. However, I don't know if it affects code size / performance.