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Implement flatten for Option<&Option<T>> and Option<&mut Option<T>> #108671

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@Coca162 Coca162 commented Mar 2, 2023

Submitting this to see if it can be done as a pr or if it needs to be a RFC.

Creates .flatten_ref() to get a immutable reference of a nested option and .flatten_mut() for mutable references. Return type is Option<&T> as &Option<T> would require returning a references to None which can't be done in constant functions.

ACP: rust-lang/libs-team#186

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rustbot commented Mar 2, 2023

r? @cuviper

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Mar 2, 2023
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rustbot commented Mar 2, 2023

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.

Examples of T-libs-api changes:

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  • Introducing new or changing existing unstable library APIs (excluding permanently unstable features / features without a tracking issue)
  • Changing public documentation in ways that create new stability guarantees
  • Changing observable runtime behavior of library APIs

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cuviper commented Mar 2, 2023

Please do create an API Change Proposal as linked above.

@rustbot label +T-libs-api -T-libs
r? libs-api

@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 Mar 2, 2023
@rustbot rustbot assigned joshtriplett and unassigned cuviper Mar 2, 2023
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@anden3 anden3 added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 14, 2023
@Dylan-DPC Dylan-DPC added S-waiting-on-ACP Status: PR has an ACP and is waiting for the ACP to complete. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 20, 2023
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r? libs-api

@rustbot rustbot assigned BurntSushi and unassigned joshtriplett Feb 11, 2024
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bors commented Oct 2, 2024

☔ The latest upstream changes (presumably #130829) made this pull request unmergeable. Please resolve the merge conflicts.

@bors bors added the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Oct 2, 2024
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