Christian brainstorming image_read_iterator for Boost.GIL

image_read_iterator-blueprint.hpp

// Christian Henning's original: http://pastebin.com/Qk3ssZc8

namespace boost { namespace gil {

template< typename Reader
        , typename View
        >
class image_read_iterator
{
public:

    typedef std::input_iterator_tag iterator_category;
    typedef View value_type;
    typedef View const* pointer;
    typedef View const& reference;
    
    /// todo
    //typedef ptrdiff_t difference_type;

public:

    image_read_iterator()
    : _reader( NULL )
    , _view( NULL )
    {}

    image_read_iterator( Reader& reader
                  , View&   view
                  )
    : _reader( &reader )
    , _view( &view )
    {}

private:

    Reader* _reader;
    View*   _view;
};

} // namespace gil
} // namespace boost