Data Slicing With Passing by Value : reference « Data Type « C++

1. C++
2. Data Type
3. reference

Data Slicing With Passing by Value

  
#include <iostream>
using namespace std;

class Mammal{
  public:
     Mammal():itsAge(1) { }
     virtual ~Mammal() { }
     virtual void Speak() const { cout << "Mammal speak!" << endl; }

  protected:
     int itsAge;
};

class Dog : public Mammal{
  public:
    void Speak()const { cout << "Woof!" << endl; }
};

class Cat : public Mammal
{
  public:
    void Speak()const { cout << "Meow!" << endl; }
};

void ValueFunction (Mammal);
void PtrFunction (Mammal*);
void RefFunction (Mammal&);
int main()
{
   Mammal* ptr=0;
   int choice;
   while (1)
   {
      bool fQuit = false;
      cout << "(1)dog (2)cat (0)Quit: ";
      cin >> choice;
      switch (choice)
      {
          case 0: fQuit = true;
                  break;
          case 1: ptr = new Dog;
                  break;
          case 2: ptr = new Cat;
                  break;
          default: ptr = new Mammal;
                   break;
      }
      if (fQuit == true)
         break;
      PtrFunction(ptr);
      RefFunction(*ptr);
      ValueFunction(*ptr);
   }
   return 0;
}

void ValueFunction (Mammal MammalValue)
{
   MammalValue.Speak();
}

void PtrFunction (Mammal * pMammal)
{
   pMammal->Speak();
}

void RefFunction (Mammal & rMammal)
{
   rMammal.Speak();
}
  
    
  

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