c++继承中拷贝构造问题

子类拷贝构造要先调用父类的拷贝构造 详情请看下面代码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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