编译错误 --- does not name a type和field `XX' has incomplete type

 编译错误一:XX does not name a type.net 编译错误二:field `XX' has incomplete type指针 编译错误一:XX does not name a type, 中文意思为“XX没有命名一个类型“code 拿个例子来说,若是两个类定义以下:blog class B{ public: B(){} ~B(){} private: A a;
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