可能是
头文件相互包含
如a.h中有include b.h
b.h中有include a.h
解决方法：把b.h中include a.h去掉，并把该句加入到b.cpp中。即在b的cpp文件中包含a的头文件，而不是在b的头文件中包含。
或者可能是
构造函数的参数类型找不到（没包含相应头文件或者类型名写错了）
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