This header was originally in the C standard library as
C compatibility header. alignas and alignof are keywords in C++, but they were not keywords in C until C23.
| C compatibility macro constant, expands to integer literal
<cstdalign> is deprecated in C++17 and removed in C++20. Corresponding
<stdalign.h> is still available in C++20.
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
|DR||Applied to||Behavior as published||Correct behavior|
|LWG 3827||C++11|| C programs no longer need the compatibility |
| deprecated this
macro in C++
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