Let's say I have a base class
Animal from which a class Cow inherits, and a Barn class containing an
Animal vector, and let's say the
Animal class has a virtual function scream(), which Cow overrides.
With the following code:
Animal.h
#ifndef _ANIMAL_H
#define _ANIMAL_H
#include <iostream>
using namespace std;
class
Animal {
public:
Animal() {};
virtual void scream() {cout << "aaaAAAAAAAAAAGHHHHHHHHHH!!! ahhh..." << endl;}
};
#endif /* _ANIMAL_H */
Cow.h
#ifndef _COW_H
#define _COW_H
#include "
Animal.h"
class Cow: public
Animal {
public:
Cow() {}
void scream() {cout << "MOOooooOOOOOOOO!!!" << endl;}
};
#endif /* _COW_H */
Barn.h
#ifndef _BARN_H
#define _BARN_H
#include "
Animal.h"
#include <vector>
class Barn {
std::vector<Animal> animals;
public:
Barn() {}
void insertAnimal(Animal animal) {animals.push_back(animal);}
void tortureAnimals() {
for(int a = 0; a < animals.size(); a++)
animals[a].scream();
}
};
#endif /* _BARN_H */
and finally main.cpp
#include <stdlib.h>
#include "Barn.h"
#include "Cow.h"
#include "Chicken.h"
/*
*
*/
int main(int argc, char** argv) {
Barn barn;
barn.insertAnimal(Cow());
barn.tortureAnimals();
return (EXIT_SUCCESS);
}
I get this output:
aaaAAAAAAAAAAGHHHHHHHHHH!!! ahhh...
How should I code this to get MOOooooOOOOOOOO!!! (and whatever other classes inheriting
Animal wants scream() to be) instead?
