Peter and I will have a paper in this upcoming mailing, which can be found here (
https://isocpp.org/files/papers/P3560R0.html). We're proposing that error handling in reflection should use exceptions to be recoverable, now that it is possible to have recoverable exceptions during constant evaluation.
The part that concerns this list is... what type should std::meta::exception::what() return: std::string_view or std::u8string_view?
- Argument for u8string_view: this is the principled, type system correct answer.
- Argument for string_view: this is the only type for which there is absolutely any support whatsoever in the standard library to do anything.
As you all know, this is an area in which I have no expertise (neither current nor, if I'm being honest, desired). This discussion will have to go to SG16 eventually, so I wanted to just expedite the process.
As we point out, P2996 used to originally use string_view everywhere and we changed to provide a dual interface (e.g. identifier_of() and u8identifier_of() both exist). That's not really feasible for std::meta::exception, we kind of have to pick one.
Thanks,
Barry