Question

I want to make a class in C++, which other classes inherit from it. But I want to make sure that no one will be able to make an instance from this class.

Meaning:

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

class Fish: public Animal{
};

I want to make sure that:

Fish* fish = new Fish();

would be possible, but

Animal* ana = new Animal();

would not.

How can I do it?

Answer 1

Make it an abstract class