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#define offsetof(__type, __member) ((size_t)((void*)&(((__type*)0)->__member)))
/** get offset of a structure member **/
/***
determines the offset, in bytes, of a specified field in a TYPE(struct).
***/
/*
PROTOTYPE(size_t offsetof(<var>type</var>, <var>member</var>);)
RETURN_SUCCESS(the offset of ARGUMENT(member) in ARGUMENT(type))
UNDEFINED(ARGUMENT(member) is a bit-field)
STDC(1)
*/
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