Return the address of the non-modifiable tree node at which this iterator is positioned, or 0 if this iterator is not at a valid position in the tree. Note that this method is an implementation detail and is not part of the C++ standard.
Declared in <bslstl_treeiterator.h>
<bslstl_treeiterator.h>
bslalg::RbTreeNode const* node() const;