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Tip of the Day
Language: C++
Expertise: Intermediate
Aug 15, 2005

Call a Private Method of a Class

Use this polymorphic technique to cheat the compiler and expose private information:

See the code below.
class A{
public:
	virtual void f2()
	{
		printf("in A::f2\n");
	}
};

class B: public A{
private:
	void f2(int j)
	{
		printf("in B::f2\n");
	}	
};

int main()
{
	B b;
	A *a = &b;
	a->f2(10);
	
}
Because a->f2 is virtual and called run time, using it calls f2 of B. F2 is private in B, but still you're still able to call it. That's the magic.
Ganesh Kumar
 
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