Comment by TuxSH
2 days ago
> I mean, the c++ committee introduced "start_lifetime_as", effectively declaring all existing low-level c++ programs invalid
Did it? Wasn't that already the case before P2590R2?
And yes, a lot of the C++ lifetime model is insanity (https://en.cppreference.com/w/cpp/language/lifetime). Fortunately, contrary to the committee, compiler vendors are usually reasonable folks allowing needed low-level idioms (like casting integer constants to volatile ptr) and provide compiler flags whenever necessary.
Thank you for the correction! Indeed, the "magic malloc" part (P0593R6, a heroic effort by the way) looks to have gone in earlier into C++20. As you say, no sane compiler was affected by that change, the committee like a boss went in, saw everyone working, said "you all have our permission to continue working" and left.