Resolving Ambiguity in Case of Multiple Inheritance Involving Common Base Classes : multiple base classes « Class « C++ Tutorial






#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 : 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 : 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()const{ cout << "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; }
    virtual int GetAge() const { return Horse::GetAge(); }
  private:
    long itsNumberBelievers;
};

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

int main()
{
   Pegasus *pPeg = new Pegasus(Red, 5, true, 10, 2);
   int age = pPeg->GetAge();
   cout << "This pegasus is " << age << " years old.\n";
   delete pPeg;
   return 0;
}








9.19.multiple base classes
9.19.1.An example of multiple base classes.
9.19.2.multiple inheritance with employees and degrees
9.19.3.multiple inheritance with English Distances
9.19.4.Multiple Inheritance to have the features from both parent
9.19.5.Resolving Ambiguity in Case of Multiple Inheritance Involving Common Base Classes
9.19.6.Multiple Inheritance in both private and public way
9.19.7.In cases of multiple inheritance: Constructors are called in order of derivation, destructors in reverse order
9.19.8.Multiple inheritance example