+ /**
+ The forward iterator for a split-list has the following features:
+ - it has no post-increment operator
+ - it depends on underlying ordered list iterator
+ - The iterator object cannot be moved across thread boundary because it contains GC's guard that is thread-private GC data.
+ - Iterator ensures thread-safety even if you delete the item that iterator points to. However, in case of concurrent
+ deleting operations it is no guarantee that you iterate all item in the split-list.
+ Moreover, a crash is possible when you try to iterate the next element that has been deleted by concurrent thread.
+
+ @warning Use this iterator on the concurrent container for debugging purpose only.
+
+ The iterator interface:
+ \code
+ class iterator {
+ public:
+ // Default constructor
+ iterator();
+
+ // Copy construtor
+ iterator( iterator const& src );
+
+ // Dereference operator
+ value_type * operator ->() const;
+
+ // Dereference operator
+ value_type& operator *() const;
+
+ // Preincrement operator
+ iterator& operator ++();
+
+ // Assignment operator
+ iterator& operator = (iterator const& src);
+
+ // Equality operators
+ bool operator ==(iterator const& i ) const;
+ bool operator !=(iterator const& i ) const;
+ };
+ \endcode
+ */