Mega Code Archive
Data Slicing With Passing by Value
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#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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