Class Inheritance question

[Ogoyant]

Hello all,

I have something like the following classes:

class appClass
{
public:

//...

protected:
	inputClass input;
};

class inputClass
{
public:

//...

	virtual void handleInput();
};

void inputClass::handleInput()
{
	//... (generic code for handling input)
}

class derivedAppClass : public appClass
{
	//
};

My purpose is to define a specialized version of handleInput() in my derivedAppClass, so that I can perform generic input processes plus specific tasks within it, like so:

//derivedAppClass 's handleInput:
void handleInput()
{
	appClass::input.handleInput();
	
	// (specialized input-handling code should go here)
}

How should I do that? Essentially, I'd like to redefine a virtual function of a member from my base class (appClass::input.handleInput()), in my derived class (derivedAppClass::input.handleInput()).
So far I've come across cases where I've used virtual functions in a derived class of the base class, like this:

class class1
{
public:
	virtual void f1();
};

class class2 : public class1
{
public:
	void f1();
};

So I'm not sure how to go about something like this.


Thanks in advance for any input, I appreciate it!

EDIT: I guess one way to approach this could be multiple inheritance:

class appClass
{
	//... (no inputClass member defined at all)
};

class inputClass
{
//...
protected:
	virtual void handleInput();
};

void inputClass::handleInput()
{
	// (generic input handling code)
}

class derivedAppClass : public appClass, public inputClass
{
protected:
	void handleInput();
};

void derivedAppClass::handleInput()
{
	inputClass::handleInput();
	
	// (specific input handling code)
	
}

Is there any way to do this as originally specified though? By redefining the virtual function of the protected appClass member through derivedAppClass?