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#ifndef CONTS_H
#define CONTS_H
#define CONTS_JOIN2(a, b) a##_##b
#define CONTS_JOIN(a, b) CONTS_JOIN2(a, b)
#define CONTAINER_OF(ptr, type, member) \
(type *)((char *)(ptr) - offsetof(type, member))
#define foreach(name, i, s)\
for (auto i = CONTS_JOIN(name, begin)(s);\
!CONTS_JOIN(name, end)(s, i);\
i = CONTS_JOIN(name, next)(i))
#endif /* CONTS_H */
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