c++ - 禁止继承

Question

我有一个父类:

 class Animal
    {
    public :
       virtual void SetColor ( const string & col )
       {
         colour = col;
       }  

       virtual void Greeting ( const string & name )
       {
         cout << "Hi I'm Animal" << endl;
       }
    protected:
     string colour;
    };

然后我有一个继承自 Animal 类的 Dog 类。

例如:

class Dog : public Animal
{

};

如果我没记错的话，Dog 子类继承了父类 Animal 的所有内容，所以在这种情况下，Dog 类继承了 2 个方法 SetColor 和 Greeting 以及 字符串颜色。

Is it possible to forbid method "Greeting" in parent class Animal to inherit?

Answer 1

你可以强制Dog提供它自己的Greeting:

#include <iostream>
#include <string>

class Animal {
public:
    virtual void SetColor(const std::string & col)
    {
        colour = col;
    }

    virtual void Greeting(const std::string & name) = 0;

protected:
    std::string colour;
};

class Dog : public Animal {

    virtual void Greeting(const std::string & name) override
    {
        std::cout << "Hi I'm a dog. My name is " << name << ". I was forced to provide this function.\n";

    }
};

int main(void)
{
    Animal *ptr = new Dog();
    ptr->Greeting("Fluffy");
    delete ptr;
    return 0;
}