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

class Animal {
  public:
  	string name;
  	Animal (const std::string& givenName) : name(givenName) {

  	}
    string speak () {
      return "";
    }
  		
  };

class Dog: public Animal {
  public:
  	Dog (const std::string& givenName) : Animal (givenName) {

  	}
    string speak ()
      { return "Woof, woof!"; }
  };

class Cat: public Animal {
  public:
  	Cat (const std::string& givenName) : Animal (givenName) {
  	}
    string speak ()
      { return "Meow..."; }
  };

int main() {
	std::vector<std::unique_ptr<Animal>> animals;
	animals.push_back( new Dog("Skip") );
	animals.push_back( new Cat("Snowball") );

	for( int i = 0; i< animals.size(); ++i ) {
		cout << animals[i]->name << " says: " << animals[i]->speak() << endl;
	}
    	
}