src/base/cl_offsetof.h

   1 // offsetof() and friends
   2
   3 // <stddef.h> in GCC 3.0/3.1 has the obscure property of redefining
   4 // offsetof every time it is included, not just the first time.
   5 // Therefore we do the same thing here, and make sure that this file
   6 // gets included after each include of <stddef.h>.
   7
   8 #undef offsetof
   9 #if defined(__GNUG__)
  10   #define offsetof(type,ident)  ((long)&(((type*)1)->ident)-1)
  11 #else
  12   #define offsetof(type,ident)  ((long)&(((type*)0)->ident))
  13 #endif
  14
  15 #ifndef _CL_OFFSETOF_H
  16 #define _CL_OFFSETOF_H
  17
  18 #define offsetofa(type,ident)  offsetof(type,ident[0])
  19
  20 #endif /* _CL_OFFSETOF_H */