相互引用的结构 [英] Structs that refer to each other

问题描述

我想要有两个可以包含对方的结构。这里有一个例子：

$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $
};

struct b {
struct a aa;
};

但是这段代码不能编译。 gcc说：

  test.c：3：error：field'bb'has incomplete type 
  

有没有办法实现这个功能？

解决方案

这应该如何工作？ a 将包含 b ，其中包含 a ，其中会包含 b 等等...

我想你想用指针吗？

  struct b; 
 
 struct a {
 struct b * bb; 
}; 
 
 struct b {
 struct a * aa; 
}; 
  

尽管如此，编码风格却很糟糕 - 如果可能，应该避免循环依赖。

b $ b

I want to have two structs that can contain each other. Here is an example:

struct a {
  struct b bb;
};

struct b {
  struct a aa;
};

But this code doesn't compile. gcc says:

test.c:3: error: field ‘bb’ has incomplete type

Is there a way to achieve this?

解决方案

How is that supposed to work? a would contain b, which would contain a, which would contain b, etc...

I suppose you want to use a pointer instead?

struct b;

struct a {
  struct b *bb;
};

struct b {
  struct a *aa;
};

Even that though is bad coding style - circular dependencies should be avoided if possible.

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