一、編譯錯誤代碼：

#include int main()

{

#define offsetof(type, member) ((size_t) &((type *)0->member))

struct test

{

int a;

int b;

};

printf("offset of a %d\n", offsetof(struct test, a));

printf("offset of b %d\n", offsetof(struct test, b));

return 0;

}

二、錯誤信息：

test.c:5:57: 錯誤：‘->’參數類型無效(有‘int’)

#define offsetof(type, member) ((size_t) &((type *)0->member))

^

test.c:13:32: 附注：in expansion of macro ‘offsetof’

printf("offset of a %d\n", offsetof(struct test, a));

^~~~~~~~

test.c:5:57: 錯誤：‘->’參數類型無效(有‘int’)

#define offsetof(type, member) ((size_t) &((type *)0->member))

^

test.c:14:32: 附注：in expansion of macro ‘offsetof’

printf("offset of b %d\n", offsetof(struct test, b));

^~~~~~~~

三、錯誤原因

運算符"->"的優先級高于強轉的優先級，編譯器先取0->member的值

四、修改后代碼

#include int main()

{

#define offsetof(type, member) ((size_t) &(((type *)0)->member))

struct test

{

int a;

int b;

};

printf("offset of a %d\n", offsetof(struct test, a));

printf("offset of b %d\n", offsetof(struct test, b));

return 0;

}

總結

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