P2542R8 `views::concat`
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- Dominant language
- C++
- Stars
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- Merged PRs (30d)
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Description
WG21-P2542R8 views::concat
LWG-4079 Missing Preconditions in concat_view::iterator's conversion constructor
LWG-4082 views::concat(r) is well-formed when r is an output_range
LWG-4166 concat_view::end() should be more constrained in order to support noncopyable iterators
LWG-4553 Add a reserve_hint function to concat_view [when both this and #5299 are implemented]
Feature-test macro:
#define __cpp_lib_ranges_concat 202403L
Note: We are not yet accepting PRs for C++26 features.
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 reviewing WG21-P2542R8 and the listed LWG issues 4079, 4082, 4166, and 4553, then locate the existing concat_view implementation and its tests. Done means implementing the applicable standard changes, including the __cpp_lib_ranges_concat 202403L feature-test macro; the issue notes that PRs for C++26 features are not yet being accepted.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- devtools
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100