microsoft / microsoft/STL

WG21-P3798R1 `expected::has_error()`

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cxx29
Dominant language
C++
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Description

WG21-P3798R1 expected::has_error()

INCREASED feature-test macro:

#define __cpp_lib_expected 202606L

Note: We are not yet accepting PRs for C++29 features.

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reading WG21-P3798R1, then locate the repository's existing implementation of std::expected and its feature-test macro. The issue provides no file or test entry point; completion would require implementing expected::has_error() and updating __cpp_lib_expected to 202606L when the project is ready to accept C++29 features.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
compilers
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
25/100

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