C 中的循环定义
我写的是：
typedef enum _MyStatus
{
MY_STATUS_OK = 0,
MY_STATUS_GENERAL_ERROR = -1,
} MyStatus;
typedef MyStatus (*MyCallback)(MySettings *settings);
typedef struct _MySettings
{
MyCallback callback;
} MySettings
但是，它不会编译，因为在定义 MyCallback 时它不知道 MySettings。如果我交换 MySettings 和 MyCallback，情况就会相反：MySettings 不会知道 MyCallback。
C 语言通常如何处理此类问题？
谢谢！
What I've written is:
typedef enum _MyStatus
{
MY_STATUS_OK = 0,
MY_STATUS_GENERAL_ERROR = -1,
} MyStatus;
typedef MyStatus (*MyCallback)(MySettings *settings);
typedef struct _MySettings
{
MyCallback callback;
} MySettings
However, it wouldn't compile as when defining MyCallback it doesn't know of MySettings. If I swapped MySettings and MyCallback, it would be the other way round: MySettings wouldn't know of MyCallback.
How generally is this sort of problem handled in C?
Thanks!
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如何将这一行放在顶部：
此 C 常见问题解答：如何定义一对相互引用的结构? 可能有用。
How about putting this line at the top:
This C FAQ: How can I define a pair of mutually referential structures? might be of use.