C / C++ / MFC

George_George wrote:

I have got your point, which is, in __interface we can put function body and implement and non-pure virtual function, and the function body is not ignored by compiler. Right?

George_George wrote:

"The pure-virtualness of a function and whether or not it contains a body are independent issues."

Why do you say it is independent issue?

__interface IFoo {

	int goo() {return 0;}
};

int main()
{
	cout << IFoo::goo() << endl;

	return 0;
}

__interface Base
{
public:	
virtual void Func() = 0	{		cout << "Base::Func()" << endl;	}
}; 

class Derived : public Base
{
public:	virtual void Func()	{		cout << "Derived::Func()" << endl;	}
}; 

int main(int argc, char* argv[])
{	
	Derived d;	
	d.Base::Func(); 	
	return 0;
}

George_George wrote:

1. Are they correct code?

George_George wrote:

2. It looks redundant to call so many times of AddRef and Release just to make the counter consistent, if you were me, do you have ways to write better code?

George_George wrote:

My question is, why static_cast to result in IUnknown*? Why not static_cast to result in IUnknown* to be more straightforward (even if I think using IX* and IUnknown* have the same effect)? Are there any reasons or advantages if we use IX* other than IUnknown*?