Simple strategy pattern example with templates

gistfile1.cpp

template<class ADVANCE_STRATEGY>
class base_iterator : ADVANCE_STRATEGY
{
private:
    int * pointer;
public:
    base_iterator & operator++()
    {
        advance(pointer);
    }
};

class straight_strategy 
{
    void advance(int *& pointer)
    {
        ++pointer;
    }
};

class reverse_strategy
{
    void advance(int *& pointer)
    {
        --pointer;
    }
};

typedef base_iterator<straight_strategy> iterator;
typedef base_iterator<reverse_strategy> reverse_iterator;