boost::gil::make_scanline_reader

template<
    typename Device,
    typename FormatTag>
get_scanline_reader<Device, FormatTag>::type
make_scanline_reader(
    Device& io_dev,
    FormatTag const&)
requires mp11::mp_and
        <
            detail::is_adaptable_input_device<FormatTag, Device>,
            is_format_tag<FormatTag>
        >::value;