#include <stdio.h>

template<class T>
struct key_type
{
        typedef int iterator;
};

template<class T>
struct value_type
{
        key_type<T>::iterator itr;
};

template<class T>
class my_class : public value_type<T>
{
};

int main()
{
        my_class<int> my;

        return 0;
}