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List:       kde-devel
Subject:    Re: accessing protected members of a parent class
From:       Patrick Julien <freak () ideasandassociates ! com>
Date:       2002-04-04 16:40:50
[Download RAW message or body]

you have to make B a friend in the protected or private section of class A.

Ellis Whitehead wrote:
> Is it possible to access protected members in an object whose type is a 
> superclass of the current method's class?  Somehow in over ten years of C++ 
> programming, I've missed or forgotten the fact that this isn't allowed. :(
> 
> Compiling the following code, for example, results in the following error:
> 
> $ g++ test.cpp -o test.o
> test.cpp: In method `void B::link(A *)':
> test.cpp:4: `void A::link(A *)' is protected
> test.cpp:15: within this context
> 
> 
> class A
> {
>  protected:
> 	virtual void link( A* );
> };
> 
> class B : public A
> {
>  protected:
> 	virtual void link( A* );
> };
> 
> void B::link( A* a )
> {
> 	a->link( 0 );	// *** fails ***
> }
> 
>  
> 
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-- 
Patrick Julien
Ideas & Associates
(514) 940-2891x211

 
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