P3725R3 Filter View Extensions For Safer Use
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cxx20
defect report
ranges
- Dominant language
- C++
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Description
WG21-P3725R3 Filter View Extensions For Safer Use
Feature-test macro:
#define __cpp_lib_ranges_filter 202603L
At the 2026-03 meeting in Croydon, this paper was formally accepted as a Defect Report, so it should be implemented retroactively back to C++20.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading the WG21 P3725R3 paper and the issue's stated feature-test macro. Determine the required Filter View extensions and how the accepted Defect Report applies retroactively to C++20. Done means the C++20 implementation reflects the paper and exposes __cpp_lib_ranges_filter as 202603L.
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
- Mostly clear
- Newbie friendliness
- 35/100