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Added container_of(). This seems about the best place to put it, since 

the definition of it uses offsetof(), and the two concepts are related.
pull/1/head
Michael Brown 2006-03-23 22:07:21 +00:00
parent 99032becce
commit 508dcdb303
1 changed files with 7 additions and 2 deletions
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9
src/include/stddef.h
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@ -2,12 +2,17 @@
#define STDDEF_H #define STDDEF_H
/* for size_t */ /* for size_t */
#include "stdint.h" #include <stdint.h>
#undef NULL #undef NULL
#define NULL ((void *)0) #define NULL ((void *)0)
#undef offsetof #undef offsetof
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#undef container_of
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
#endif /* STDDEF_H */ #endif /* STDDEF_H */