C / C++ / MFC

__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*?

class Base {
public:
	int foo() {cout << "Base" << endl;}
};

class Derived1: public Base
{
public:
	int foo() {cout << "Derived1" << endl;}
};

class Derived2: public Base
{
public:
	int foo() {cout << "Derived2" << endl;}
};

class Final: public Derived1, public Derived2 {
public:
	int foo() {cout << "Final" << endl;}
};

int main()
{
	Final f;
	Base* pb = &f; //error C2594: 'initializing' : ambiguous conversions from 'Final *' to 'Base *'
	return 0;
}

Base* pb = (Derived1 *)&f; 

IUnknown* pI = static_cast<iunknown*>(static_cast <ix*> (new CA));
</ix*></iunknown*>