c - 链表 A 绑定(bind)到另一个 B 又绑定(bind)回 A

Question

//2 个由指针绑定(bind)的结构

 struct A_cust            // customer information, a double-linked list with another pointer
   {
    char cust_info [20];  // as an example
    A_cust *prevCust;     // prev customer record
    A_cust *nextCust;     // next customer record
    B_tran *point_to_B;   // to the list of transaction records
   };

 struct B_tran            // transaction records, a double-linked list with another pointer
   {
    char cust_tran [20];  // as an example
    B_tran *prevTran;     // prev customer transaction
    B_tran *nextCust;     // next customer transaction
    A_cust *point_to_A    // to the list of customer records
   };

编译器在解析“A_cust”时并不知道“B_tran” 如果我先定义“B_tran”，那么编译器就不知道“A_cust”是什么

任何想法，欧内斯特

Answer 1

在代码顶部添加以下声明

struct B_tran;

编辑:这称为前向声明，您向编译器 promise 您稍后将开始定义 B_tran。 (感谢格雷格)