#include<iostream>
#include<vector>
using namespace std;

class animal {
public:
	virtual void talk() {};
	virtual void alternative_talk() {};

};

class cat : public animal {
public:
	void talk() override {
		cout << "meow\n";
	}
	void alternative_talk()  {
		cout << "whirp\n";
	}
};

class goat : public animal {
public:
	void talk() {
		cout << "mah\n";
	}
	void alternative_talk() {
		cout << "blah\n";
	}
};

int main(){
	cat c;
	goat g;

	vector<animal*> zoo;
	zoo.push_back(&c);
	zoo.push_back(&g);

	for(auto a : zoo)
		a->talk();


	return 0;
}