Mega Code Archive
Virtual functions are hierarchical
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#include <iostream>
using namespace std;
class BaseClass {
public:
int i;
BaseClass(int x) {
i = x;
}
virtual void myFunction()
{
cout << "Using BaseClass version of myFunction(): ";
cout << i << '\n';
}
};
class DerivedClass1 : public BaseClass {
public:
DerivedClass1(int x) : BaseClass(x) {}
void myFunction()
{
cout << "Using DerivedClass1's version of myFunction(): ";
cout << i*i << '\n';
}
};
class DerivedClass2 : public BaseClass {
public:
DerivedClass2(int x) : BaseClass(x) {}
};
int main()
{
BaseClass *p;
BaseClass ob(10);
DerivedClass1 derivedObject1(10);
DerivedClass2 derivedObject2(10);
p = &ob;
p->myFunction(); // use BaseClass's myFunction()
p = &derivedObject1;
p->myFunction(); // use DerivedClass1's myFunction()
p = &derivedObject2;
p->myFunction(); // use BaseClass's myFunction()
return 0;
}
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