template<typename Image>
struct boost::gil::RandomAccess2DImageConcept< Image >
2-dimensional container of values 
concept RandomAccess2DImageConcept<RandomAccessNDImageConcept Image>
{
    typename x_coord_t = const_view_t::x_coord_t;
    typename y_coord_t = const_view_t::y_coord_t;
    Image::Image(x_coord_t width, y_coord_t height, std::size_t alignment=1);
    Image::Image(x_coord_t width, y_coord_t height, value_type fill_value, std::size_t alignment);
    x_coord_t Image::width() const;
    y_coord_t Image::height() const;
    void Image::recreate(x_coord_t width, y_coord_t height, std::size_t alignment=1);
    void Image::recreate(x_coord_t width, y_coord_t height, value_type fill_value, std::size_t alignment);
};