NAME

stdalign.h — alignment macros

SYNOPSIS

#include <stdalign.h>

DESCRIPTION

^[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2024 defers to the ISO C standard.

The <stdalign.h> header shall define the following macros:

alignas

Expands to _Alignas

alignof

Expands to _Alignof

__alignas_is_defined

Expands to the integer constant 1

__alignof_is_defined

Expands to the integer constant 1

The __alignas_is_defined and __alignof_is_defined macros shall be suitable for use in #if preprocessing directives.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

None.

CHANGE HISTORY

First released in Issue 8. Included for alignment with the ISO/IEC 9899:2018 standard.