C++Talk.NET

hokus · Guest

I have the following class:

<CODE>

class List
{
public:

class Node
{
public:
Node* m_next;
};

class Iterator
{
public:
Node *m_position;
};

class ConstIterator
{
public:
ConstIterator( Node* pos );
Node *m_position;
};

// utility functions
ConstIterator begin() const;
Iterator begin();

// data members
Node* m_head;

};

</CODE>

The problematic implementation of const begin is:

<CODE>

List::ConstIterator
List::begin() const
{
return List::ConstIterator(m_head);
}

</CODE>

This is wrong because it is impossible to convert const List::m_head to just
pointer. My question is how to project class List to use Iterator and
ConstIterator functionality? I know I can use const_cast to remove constant
property from const List::m_head pointer but I think this isn't a good idea.

Thanks

Shezan Baig · Guest

hokus wrote:

hokus · Guest

This works of course, but how about std::list::const_iterator(_Nodeptr
_Pnode)? As you can see this function doesn't use const keyword. How to
accomplish this?

Thanks

hokus · Guest

This works of course, but how about std::list::const_iterator(_Nodeptr
_Pnode)? As you can see this function doesn't use const keyword. How to
accomplish this?

Thanks

Shezan Baig · Guest

hokus wrote: