編譯錯誤 --- does not name a type和field `XX' has incomplete type

 編譯錯誤一：XX does not name a type.net 編譯錯誤二：field `XX' has incomplete type指針 編譯錯誤一：XX does not name a type， 中文意思爲「XX沒有命名一個類型「code 拿個例子來說，若是兩個類定義以下：blog class B{ public: B(){} ~B(){} private: A a;

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