P2985R0 `is_virtual_base_of`
Open
Nobody has claimed this yet.
compiler
cxx26
- Dominant language
- C++
- Stars
- 11.1k
- Forks
- 1.7k
- Avg merge
- 4d 15h
- Merged PRs (30d)
- 22
Description
WG21-P2985R0 is_virtual_base_of
Feature-test macro:
#define __cpp_lib_is_virtual_base_of 202406L
Clang's compiler builtin is named __builtin_is_virtual_base_of, see llvm/llvm-project#98310 available in Clang 20. MSVC and EDG should follow suit.
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
The issue names WG21-P2985R0 and Clang's __builtin_is_virtual_base_of, but no repository files or tests. Start by reading the proposal and the referenced compiler-builtin change, then identify the STL implementation and feature-test coverage needed. Done would mean coordinated support for the trait and __cpp_lib_is_virtual_base_of; the issue notes that PRs are not yet being accepted.
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
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100