相互引用的结构体定义

样例1（正确样例）：

typedef struct tagTest_B TEST_B_S;

typedef struct tagTest_A
{
TEST_B_S *pstB;
} TEST_A_S;

struct tagTest_B
{
TEST_A_S *pstA;
};

样例二：

struct B;
typedef struct A
{
     struct B *p;
     int a;
     int b;
}AAA;

typedef struct B
{
    struct A *p;
    int aa;
    int bb;
}BBB;

样例三：

typedef struct A AAA;
typedef struct B BBB;

struct A
{
  BBB *p;
  int a;
  int b;
};


struct B
{
  AAA *p;
  int aa;
  int bb;
};

注：c语言与C++不同，这里的声明必须加typedef
typedef struct A AAA;
typedef struct B BBB;

参考：
https://blog.youkuaiyun.com/f290131665/article/details/17678851