template <class T> class range
{
public:
    template <class T> class iterator
    {
    public:
        iterator(T c) : m_count(c) {}

        T operator*() const { return m_count; }
        void operator++() { ++m_count; }
        bool operator!=(const iterator &x) { return (**this) != (*x); }

    private:
        T m_count;
    };

    range(T end) : m_begin(0), m_end(end) {}
    range(T begin, int end) : m_begin(begin), m_end(end) {}

    iterator<T> begin() { return iterator<T>(m_begin); }
    iterator<T> end() { return iterator<T>(m_end); }

private:
    T m_begin;
    T m_end;
};