C ++虚拟析构函数和符号引用错误

Question

Only because I want to have virtual methods to apply polymorphism in my parent and child class, I put in virtual destructor. I do however, keep getting error

Child:: ~Child()

Child:: Child() as symbol referencing error.

class Parent {
public: Parent();
        virtual ~Parent();
};

class Child {
public:
      Child();   
       ~Child();
};

Answer 1

您必须定义析构函数，而不仅仅是声明它。

virtual ~Parent() {};