How do we use a abstract class as a function return type?

This question already has an answer here:

What is a smart pointer and when should I use one? 14 answers

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Are you asking for example code? Hopefully this helps...

class Mammal {
public:
    virtual void Speak() const = 0; 
};

class Dog : public Mammal {
public:
    void Speak() const {
        cout << "Woof Woof" << endl;
    }
};

Mammal* getDog() {
    return new Dog();
}

int main() {
    Mammal* m = getDog();
    m->Speak();
    delete m;
    return 0;
}

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