<cstdalign>

In some C++ standard library implementations, this header includes the C standard library header <stdalign.h>, and adds the associated names to the std namespace. Because that header isn't implemented in MSVC, the <cstdalign> header defines compatibility macros __alignas_is_defined and __alignof_is_defined.

Note

Because the <stdalign.h> header defines macros that are keywords in C++, including it has no effect. The <stdalign.h> header is deprecated in C++. The <cstdalign> header is deprecated in C++17 and removed in the draft C++20 standard.

Requirements

Header: <cstdalign>

Namespace: std

Macros

Macro	Description
__alignas_is_defined	A C compatibility macro that expands to the integer constant 1.
__alignof_is_defined	A C compatibility macro that expands to the integer constant 1.

See also

Header files reference
C++ standard library overview
Thread safety in the C++ standard library