[Bug c++/77513] -Wzero-as-null-pointer-constant vs 0, nullptr, NULL and __null

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77513

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to petschy from comment #0)
> For c++11 and later code, why is NULL defined as __null, rather than nullptr?

Because defining NULL as nullptr would violate the requirements of the
standard, which very intentionally says that NULL is an integral constant
expression, not nullptr.