Deriving ADTs from other ADTs : class hierarchy « Class « C++ Tutorial

1. C++ Tutorial
2. Class
3. class hierarchy

/*
Quote from

Teach Yourself C++ in 24 Hours, 4th Edition

Publisher: Sams; 4 edition (August 11, 2004)
Language: English
ISBN-10: 0672326817
ISBN-13: 978-0672326813
by Jesse Liberty (Author), David Horvath (Author)
*/ 
 
 #include <iostream>
 
 enum COLOR { Red, Green, Blue, Yellow, White, Black, Brown } ;
 
 class Animal        // common base to both horse and bird
 {
 public:
     Animal(int);
     virtual ~Animal() { 
        std::cout << "Animal destructor...\n"; 
     }
     virtual int GetAge() const { 
        return itsAge; 
     }
     virtual void SetAge(int age) { 
        itsAge = age; 
     }
     virtual void Sleep() const = 0;
     virtual void Eat() const = 0;
     virtual void Reproduce() const = 0;
     virtual void Move() const = 0;
     virtual void Speak() const = 0;
 private:
     int itsAge;
 };
 
 Animal::Animal(int age):itsAge(age)
 {
     std::cout << "Animal constructor...\n";
 }
 
 class Mammal : public Animal
 {
 public:
     Mammal(int age):Animal(age) { 
        std::cout << "Mammal constructor...\n";
     }
     virtual ~Mammal() { 
        std::cout << "Mammal destructor...\n";
     }
     virtual void Reproduce() const { 
        std::cout << "Mammal reproduction depicted...\n"; 
     }
 };
 
 class Fish : public Animal
 {
 public:
     Fish(int age):Animal(age) { 
        std::cout << "Fish constructor...\n";
     }
     virtual ~Fish() { 
        std::cout << "Fish destructor...\n";  
     }
     virtual void Sleep() const { 
        std::cout << "fish snoring...\n"; 
     }
     virtual void Eat() const { 
        std::cout << "fish feeding...\n"; 
     }
     virtual void Reproduce() const { 
        std::cout << "fish laying eggs...\n"; 
     }
     virtual void Move() const { 
        std::cout << "fish swimming...\n";   
     }
     virtual void Speak() const { }
 };
 
 class Horse : public Mammal
 {
 public:
     Horse(int age, COLOR color ): Mammal(age), itsColor(color) { 
        std::cout << "Horse constructor...\n"; 
     }
     virtual ~Horse() { 
        std::cout << "Horse destructor...\n"; 
     }
     virtual void Speak()const { 
        std::cout << "Whinny!... \n"; 
     }
     virtual COLOR GetItsColor() const 
         { return itsColor; }
     virtual void Sleep() const 
         { std::cout << "Horse snoring...\n"; }
     virtual void Eat() const 
         { std::cout << "Horse feeding...\n"; }
     virtual void Move() const 
         { std::cout << "Horse running...\n";}
 
 protected:
     COLOR itsColor;
 };
 
 class Dog : public Mammal
 {
 public:
     Dog(int age, COLOR color ):
         Mammal(age), itsColor(color) 
         { std::cout << "Dog constructor...\n"; }
     virtual ~Dog() 
         { std::cout << "Dog destructor...\n"; }
     virtual void Speak()const 
         { std::cout << "Whoof!... \n"; }
     virtual void Sleep() const 
         { std::cout << "Dog snoring...\n"; }
     virtual void Eat() const 
         { std::cout << "Dog eating...\n"; }
     virtual void Move() const  
         { std::cout << "Dog running...\n"; }
     virtual void Reproduce() const 
         { std::cout << "Dogs reproducing...\n"; }
 
 protected:
     COLOR itsColor;
 };
 
 int main()
 {
     Animal *pAnimal=0;
     pAnimal = new Dog(5,Brown);
     pAnimal->Speak();
     pAnimal->Eat();
     pAnimal->Reproduce();
     pAnimal->Move();
     pAnimal->Sleep();
     delete pAnimal;

     pAnimal = new Horse(4,Black);
     pAnimal->Speak();
     pAnimal->Eat();
     pAnimal->Reproduce();
     pAnimal->Move();
     pAnimal->Sleep();
     delete pAnimal;

     pAnimal = new Fish (5);
     pAnimal->Speak();
     pAnimal->Eat();
     pAnimal->Reproduce();
     pAnimal->Move();
     pAnimal->Sleep();
     delete pAnimal;

     return 0;
 }

Animal constructor...
Mammal constructor...
Dog constructor...
Whoof!...
Dog eating...
Dogs reproducing...
Dog running...
Dog snoring...
Dog destructor...
Mammal destructor...
Animal destructor...
Animal constructor...
Mammal constructor...
Horse constructor...
Whinny!...
Horse feeding...
Mammal reproduction depicted...
Horse running...
Horse snoring...
Horse destructor...
Mammal destructor...
Animal destructor...
Animal constructor...
Fish constructor...
fish feeding...
fish laying eggs...
fish swimming...
fish snoring...
Fish destructor...
Animal destructor...