1 #ifndef _STDDEF_H 2 #define _STDDEF_H 3 4 #if __cplusplus >= 201103L 5 #define NULL nullptr 6 #elif defined(__cplusplus) 7 #define NULL 0L 8 #else 9 #define NULL ((void*)0) 10 #endif 11 12 #define __NEED_ptrdiff_t 13 #define __NEED_size_t 14 #define __NEED_wchar_t 15 #if __STDC_VERSION__ >= 201112L || __cplusplus >= 201103L 16 #define __NEED_max_align_t 17 #endif 18 19 #include <bits/alltypes.h> 20 21 #if __GNUC__ > 3 22 #define offsetof(type, member) __builtin_offsetof(type, member) 23 #else 24 #define offsetof(type, member) ((size_t)( (char *)&(((type *)0)->member) - (char *)0 )) 25 #endif 26 27 #endif 28