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

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本文介绍了在C语言中如何使用标准宏offsetof()来计算结构体成员的偏移量。此外还提供了一个手动实现此功能的宏定义示例，帮助读者深入理解这一底层编程技术。

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))