c++繼承中拷貝構造問題

子類拷貝構造要先調用父類的拷貝構造 詳情請看下面代碼web class base { public: base(int initialvalue = 0): x(initialvalue) {} base(const base& rhs): x(rhs.x) {} private: int x; }; class derived: public base { public: d

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