C++ 基础c';带派生参数的tor
我创建了一些类:C++ 基础c';带派生参数的tor,c++,C++,我创建了一些类: class Base{ public: Base(int = 0); ~Base(); Base(Base&); Base(Derived&); //<- here int valueOfBase(); protected: int protectedData; private: int baseData; }; class Derived: public Base{ public: Derived(int = 0); De
class Base{
public:
Base(int = 0);
~Base();
Base(Base&);
Base(Derived&); //<- here
int valueOfBase();
protected:
int protectedData;
private:
int baseData;
};
class Derived: public Base{
public:
Derived(int = 0);
Derived(Derived&);
~Derived();
private:
int derivedData;
};
###//Impplementation in .cpp
Base::Base(Base& base)
{
baseData = base.baseData;
protectedData = base.protectedData;
cout << "base Copy C'tor" << endl;
}
Base::Base(Derived& hello)
{
baseData = hello.protectedData;
}
我可以用派生的参数来创建基本的c'tor来写这样的东西吗
Derived derived(1);
Base base1 = derived;
如果没有,为什么?
提前感谢您可能需要
派生的
的转发声明
尝试添加
派生类代码>在基类定义之上。我没有看到构造函数/析构函数的定义。另外,派生的
的定义在哪里?@Prasoon Saurav:可以吗,还是我遗漏了什么?您需要提供类派生的
的正向声明。见乔希的答案。
Derived derived(1);
Base base1 = derived;