How can I determine the byte offset of a field within a structure?

stevenliyong

于 2010-06-03 11:09:00 发布

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分类专栏： C / C++ / JAVA 语言文章标签： byte struct c

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ANSI C defines the offsetof()
 macro

in <stddef.h>
,



which lets you compute

the offset of field f
 in struct s


as

offsetof(struct s, f)
.

If for some reason you have to code this sort of thing yourself,

one possibility is

	#define offsetof(type, f) ((size_t) /

		((char *)&((type *)0)->f - (char *)(type *)0))