Illustration of the Use of Virtual Inheritance : virtual function « Class « C++

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C++ » Class » virtual functionScreenshots 
Illustration of the Use of Virtual Inheritance
  
#include <iostream>
using namespace std;

typedef int HANDS;
enum COLOR Red, Green, Blue, Yellow, White, Black, Brown ;

class Animal        
{
  public:
    Animal(int);
    virtual ~Animal() { cout << "Animal destructor...\n"}
    virtual int GetAge() const return itsAge; }
    virtual void SetAge(int age) { itsAge = age; }
  private:
    int itsAge;
};

Animal::Animal(int age):
itsAge(age)
{
   cout << "Animal constructor...\n";
}

class Horse : virtual public Animal
{
  public:
    Horse(COLOR color, HANDS height, int age);
    virtual ~Horse() { cout << "Horse destructor...\n"}
    virtual void Whinny()const cout << "Whinny!... "}
    virtual HANDS GetHeight() const return itsHeight; }
    virtual COLOR GetColor() const return itsColor; }
  protected:
    HANDS itsHeight;
    COLOR itsColor;
};

Horse::Horse(COLOR color, HANDS height, int age):
Animal(age),
itsColor(color),itsHeight(height)
{
   cout << "Horse constructor...\n";
}

class Bird : virtual public Animal
{
  public:
    Bird(COLOR color, bool migrates, int age);
    virtual ~Bird() {cout << "Bird destructor...\n";  }
    virtual void Chirp()const cout << "Chirp... ";  }
    virtual void Fly()constcout << "I can fly! I can fly! I can fly! "}
    virtual COLOR GetColor()const return itsColor; }
    virtual bool GetMigration() const return itsMigration; }
  protected:
    COLOR itsColor;
    bool itsMigration;
};

Bird::Bird(COLOR color, bool migrates, int age):
Animal(age),
itsColor(color), itsMigration(migrates)
{
   cout << "Bird constructor...\n";
}

class Pegasus : public Horse, public Bird
{
  public:
    void Chirp()const Whinny()}
    Pegasus(COLOR, HANDS, bool, long, int);
    virtual ~Pegasus() {cout << "Pegasus destructor...\n";}
    virtual long GetNumberBelievers() const
         return  itsNumberBelievers; }
    virtual COLOR GetColor()const return Horse::itsColor; }
  private:
    long itsNumberBelievers;
};

Pegasus::Pegasus(
   COLOR aColor,
   HANDS height,
   bool migrates,
   long NumBelieve,
   int age):
   Horse(aColor, height,age),
   Bird(aColor, migrates,age),
   Animal(age*2),
   itsNumberBelievers(NumBelieve)
{
   cout << "Pegasus constructor...\n";
}

int main()
{
   Pegasus *pPeg = new Pegasus(Red, 5, true, 102);
   int age = pPeg->GetAge();
   cout << "This pegasus is " << age << " years old.\n";
   delete pPeg;
   return 0;
}
  
    
  
Related examples in the same category
1.virtual function from base and derived classes
2.Virtual function and two subclasses
3.Abstract classes by virtual function with no body
4.Override non-virtual function
5.Implementing Pure Virtual Functions
6.Using Virtual Methods
7.Multiple Virtual Functions Called in Turn
8.Virtual Copy Constructor
9.virtual functions accessed from pointer
10.virtual functions with person class
11.Call parent virtual function
12.Using Virtual Functions to control the behaviour
13.Pure Virtual Functions as a prototype
14.Virtual Functions Are Hierarchical
15.Virtual function in three level inheritance
16.The Virtual Attribute Is Inherited
17.Virtual Functions and Polymorphism
18.A base class reference is used to access a virtual function
19.Virtual base classes.
20.virtual members
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