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Showing content from https://en.cppreference.com/w/cpp/language/../keyword/../header/cstdalign.html below:

Standard library header <cstdalign>Â (C++11)(until C++20), <stdalign.h>Â (C++11)

This header was originally in the C standard library as <stdalign.h>.

C compatibility header. alignas and alignof are keywords 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 literal 1
(macro constant) [edit]

__alignof_is_defined

(C++11)(deprecated)

C compatibility macro constant, expands to integer literal 1
(macro constant) [edit] [edit] Notes

<cstdalign> is deprecated in C++17 and removed in C++20. Corresponding <stdalign.h> is still available in C++20.

[edit] Defect reports

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++

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