[C++]出错member access into incomplete type

文章转自：https://blog.csdn.net/wcjwdq/article/details/43604679
版权归原作者。

在c++中，有四个文件demoA.h, demoA.cpp, demoB.h, demoB.cpp。

在demoA.h中有一个类为class demoA, 在demoB.h中有一个类为class demoB。

如果demoA类要用到demoB类，并且demoB类也要用到demoA类，那么必须要如下：

1、在demoA类的cpp文件中包含demoB类的头文件路径；

2、在demoB类的h文件中加Class demoA，同时也要在demoB类的cpp文件中添加demoA类的头文件路径；

如下：

// demoA.h
class demoA
{demoB * b;
};// demoA.cpp
#include "demoB.h"// demoB.h
class demoA;
class demoB
{demoA * parent;
};// demoB.cpp
#include "demoA.h"

这样就好了。

如果在demoB.cpp中没有加入demoA.h，那么会报错：member access into incomplete type

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