This header was originally in the C standard library as<stdalign.h>.
C compatibility header.alignas andalignof arekeywords in C++, but they were not keywords in C until C23.
Macros | |
__alignas_is_defined (C++11)(deprecated) | C compatibility macro constant, expands to integer literal1 (macro constant)[edit] |
__alignof_is_defined (C++11)(deprecated) | C compatibility macro constant, expands to integer literal1 (macro constant)[edit] |
<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 macro __alignas_is_defined since C23 | deprecated this macro in C++ |
