Re: Can nested class members access private members of nesting class?

From: Jeff (jeffplus_at_comcast.net)
Date: 12/13/03 

Date: 13 Dec 2003 10:21:45 -0800

Is Container the same as List? You've shown the definition of one,
then accessed a member of the other.

-Jeff

coolpint@yahoo.co.uk (CoolPint) wrote in message news:<159a5c32.0312122340.2074968c@posting.google.com>...
> I read in books that nested class cannot access private members of
> nesting class and vice versa unless they are made friends. Somehow, my
> compiler is letting my nested class member functions access private
> members of nesting class.
>
> template <typename T>
> class Container {
> // NO friendship given to any other
> public:
> class ContainerIterator;
> // other members
> private:
> class Node;
> Node * header;
> Node * tailer;
> int counter;
> };
>
> Nested class Node has all of its members as public so that Container
> members can access them. And then I have the nested Class
> ContainerIterator, which have both public and private parts.
>
> template <typename T>
> class Container<T>::ContainerIterator {
>
> friend class List<T>; // so that List<T> can access private members of
> Iterator
> public:
> // public members
> private:
> List<T>::Node * dummyheader;
> List<T>::Node * ptr;
> ContainerIterator(const List<T> & l , List<T>::LNode * p);
> // private members
> };
>
> I forget to declare ContainerIterator class to be a friend of
> Container class, yet member functions of ContainerIterator can access
> private members of Container class! For example,
> ContainerIterator(const List<T> & l , List<T>::LNode * p)
> {
> dummyheader = l.header; // ! This works! but why?
> ptr = p;
> };
>
> So am I misinterpreting the books or is my compiler not following the
> standard? BTW, I am using g++ 3.2.3. I am quite confused to be honest
> and would appreciate any help very much. Thanks in advance.

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