名为“ AB”的结构体可以包含AB数组吗？

Question

typedef struct unit
{
struct unit * next;

int year;
int month;
int day;
struct unit revisions[3];
char subject[100];
}schedule;

The above code is giving me the following error:

array type has incomplete element type
 struct unit revisions[3];

I'm guessing the problem is that a struct cannot contain an array of itself? If so, how can I achieve similar functionality?

Answer 1

your question contains the answer itself. struct unit * next;

You can always use a pointer to the structure type inside the structure definition, and from your function, allocate memory and use it.

Answer 2

This would be a good workaround:

typedef struct unit{
    struct unit * next;
    int year;
    int month;
    int day;
    struct unit *revisions; //just like you do with struct unit *next
    char subject[100];
}schedule;

schedule s;
s.revisions = malloc(3 * sizeof *s.revisions);