struct _Container_base0;
struct _Iterator_base0
{
    const _Container_base0 *_Getcont() const;
};

template<class _Mytree>
class _Tree_unchecked_const_iterator
{
};

template<class _Mytree>
class _Tree_const_iterator
{
public:
    typedef _Tree_const_iterator<_Mytree> _Myiter;
    typedef _Tree_unchecked_const_iterator<_Mytree> _Unchecked_type;

    _Unchecked_type _Unchecked() const
    {
        return (_Unchecked_type((_Mytree *)this->_Getcont()));
    }
};

template<class _Traits>
struct _Tree_nod : public _Traits
{
};

template<class _Traits>
struct _Tree_val : public _Tree_nod<_Traits>
{
    typedef _Tree_nod<_Traits> _Mybase;
};

template<class _Traits>
struct _Tree : public _Tree_val<_Traits>
{
    typedef _Tree_val<_Traits> _Mybase;
    typedef _Tree_const_iterator<_Mybase> const_iterator;
};

template<class _Kty>
class _Tmap_traits
{
};

template<class _Kty>
class map
{
public:
    typedef _Tree<_Tmap_traits<_Kty> > _Mybase;
};

template<class _Kty> inline
void foo()
{
    typedef map<_Kty> _Myt;
}