C / C++ / MFC

George_George wrote:

I am confused about your term of "specialize this function". Do you mean overriding?

George_George wrote:

"vtable are used to redirect a function call to the function of the child class" -- I disagree vtable is used for redirecting to child class, but I think it is used for find the actual function to call through run time type identification. We may call the function is current class if we have overriden function in current class, and we may call function in based class if we have not overridden the function in current class.

George_George wrote:

But I think whether or not we override, all visible virtual functions (including inherited ones) should be in vtable

class IBase
{
public:
	virtual void func() = 0;
};

class IFoo : IBase
{
public:
	virtual void foo() { cout << "IFoo : IBase" << endl; }
};

class IGoo : IBase
{
public:
	virtual void goo() { cout << "IGoo : IBase" << endl; }
};

class Zoo : IFoo, IGoo
{
public:
	virtual void foo() { cout << "Zoo : IBase" << endl; }
	virtual void goo() { cout << "Zoo : IBase" << endl; }
	virtual void func() {cout << "Zoo : IBase" << endl; }
};

int main()
{
	Zoo z;

	return 0;
}

CPallini wrote:

Why should foo & goo be in the VTABLE (I mean, no class overrides them)?

George_George wrote:

Do you have any ideas why foo and goo are not in class Zoo's vtable?