18 Language support library [language.support]

18.10 Other runtime support [support.runtime]

18.10.4 Header <cstdalign> synopsis [cstdalign.syn]

#define __alignas_is_defined 1
1

The contents of the header <cstdalign> are the same as the C standard library header <stdalign.h>, with the following changes: The header <cstdalign> and the header <stdalign.h> shall not define a macro named alignas.

See also: ISO C 7.15.