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This header is part oftypes support library, in particular, it provides additional basic types and convenience macros.
Types | ||
| signed integer type returned when subtracting two pointers (typedef)[edit] | ||
(C23) | the type of the predefined null pointer constantnullptr (typedef)[edit] | |
(C11) | a type with alignment requirement as great as any other scalar type (typedef)[edit] | |
| unsigned integer type returned by thesizeof operator (typedef)[edit] | ||
Constants | ||
| implementation-defined null pointer constant (macro constant)[edit] | ||
Macros | ||
| byte offset from the beginning of a struct type to specified member (function macro)[edit] | ||
#define __STDC_VERSION_STDDEF_H__ 202311L typedef/* see description */ptrdiff_t;typedef/* see description */nullptr_t;typedef/* see description */max_align_t;typedef/* see description */wchar_t;typedef/* see description */size_t; #define NULL /* see description */#define unreachable() /* see description */#define offsetof(P, D) /* see description */
Only if the implementation defines__STDC_LIB_EXT1__ and additionally the user codedefines__STDC_WANT_LIB_EXT1__ before any inclusion of<stddef.h>:
#if defined(__STDC_WANT_LIB_EXT1__)typedef/* see description */ rsize_t;#endif
