((long)(((char *)( amp;(((p _ type)NULL)- amp;gt;field)))-((char *)NULL)))((long)(((char *)( amp;(((p _ type)NULL)- amp;gt;Field)))-((char *) NULL))简介:# define xtoffset (p _ type,field)\((long)((char *)((((p _ type)NULL)- gt;field))) - ((char *) NULL
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