// inheritance and dynamic dispatch demo
// cse143 lecture 2/00  hp

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

// generic Creature class
class Creature {
public:
	// construct Creature with given name
	Creature(string name);

	// write this Creature's name and sound to cout
	virtual void speak( );
protected:
	string name;	// this Creature's name
};

Creature::Creature(string name) {
	this->name = name;
}

void Creature::speak( ) {
	cout << "A generic creature named " << name
		<< " is mute" << endl;
}

// Pigs
class Pig: public Creature {
public:
	Pig(string name);
	void speak( );
};

Pig::Pig(string name) : Creature(name) { }

void Pig::speak( ) {
	cout << "A pig named " << name 
		<< " says OINK!" << endl;
}

// Cows
class Cow: public Creature {
public:
	Cow(string name);
	void speak( );
};

Cow::Cow(string name) : Creature(name) { }

void Cow::speak( ) {
	cout << "A cow named " << name
		<< " says Help! I've been tipped and I can't get up!!" << endl;
}


// test program

// produce output from Creature c
void talk(Creature &c) {
	c.speak( );
}

// create some Creatures and see what they say
int main( ) {
	Creature fred("Fred");
	Pig piggy("Piggy");
	Cow boris("Boris");

	talk(fred);
	talk(piggy);
	talk(boris);

	cout << endl;
	return 0;
}