P3391R2: `constexpr` `std::format`
Open
c++26
format
libc++
wg21-paper
- Dominant language
- LLVM
- Stars
- 40.5k
- Forks
- 18.7k
- PR merge metrics
- PR metrics pending
Description
**Link:** https://wg21.link/P3391R2
Feature-test macro:
```c++
#define __cpp_lib_constexpr_format 202511L // also in
// updated, see LWG4531
#define __cpp_lib_constexpr_string 202511L // also in
```
Contributor guide
Research direction
Start by reading the linked P3391R2 proposal and the LWG4531 note to understand the requested constexpr std::format behavior. Then locate the existing and implementations and their feature-test macro definitions. Done means the proposal is implemented and the listed macros have the specified values.
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
- Needs clarification
- Newbie friendliness
- 25/100