git.ozlabs.org Git - ccan/blob - container_of/container_of.h

   1 #ifndef CCAN_CONTAINER_OF_H
   2 #define CCAN_CONTAINER_OF_H
   3 #include <stddef.h>
   4
   5 #include "config.h"
   6 #include "check_type/check_type.h"
   7
   8 #define container_of(member_ptr, containing_type, member)               \
   9          ((containing_type *)                                           \
  10           ((char *)(member_ptr) - offsetof(containing_type, member))    \
  11           - check_types_match(*(member_ptr), ((containing_type *)0)->member))
  12
  13
  14 #endif /* CCAN_CONTAINER_OF_H */