libtu/pointer.h

   1 /*
   2  * libtu/pointer.h
   3  *
   4  * Copyright (c) Tuomo Valkonen 2005.
   5  *
   6  * You may distribute and modify this library under the terms of either
   7  * the Clarified Artistic License or the GNU LGPL, version 2.1 or later.
   8  */
   9
  10 #ifndef LIBTU_POINTER_H
  11 #define LIBTU_POINTER_H
  12
  13 #define FIELD_OFFSET(T, F) ((long)((char*)&((T*)0)->F))
  14 #define FIELD_TO_STRUCT(T, F, A) ((T*)(((char*)A)-FIELD_OFFSET(T, F)))
  15
  16 #endif /* LIBTU_POINTER_H */