How to calculate the size of the member in a structure? At the same time, how to calculate the offset address the member in a structure? We can define following MACRO definition to settle these problems.
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/* get the size */
#define FSIZE(type, field) ((size_t)(sizeof(((type *)0)->field)))
/* get the offset address */
#define FOFFSET(type, field) ((size_t)&((type *)0)->field)
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