boost::gil::make_reader_backend

template<typename FormatTag>
get_reader_backend<std::wstring, FormatTag>::type
make_reader_backend(
    detail::filesystem::path const& path,
    image_read_settings<FormatTag> const& settings);

template<typename FormatTag>
get_reader_backend<std::wstring, FormatTag>::type
make_reader_backend(
    std::wstring const& file_name,
    image_read_settings<FormatTag> const& settings);

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

template<
    typename Device,
    typename FormatTag>
get_reader_backend<Device, FormatTag>::type
make_reader_backend(
    Device& io_dev,
    image_read_settings<FormatTag> const& settings)
requires mp11::mp_and
        <
            detail::is_adaptable_input_device<FormatTag, Device>,
            is_format_tag<FormatTag>
        >::value;

template<
    typename String,
    typename FormatTag>
get_reader_backend<String, FormatTag>::type
make_reader_backend(
    String const& file_name,
    FormatTag const&)
requires mp11::mp_and
        <
            detail::is_supported_path_spec<String>,
            is_format_tag<FormatTag>
        >::value;

template<
    typename String,
    typename FormatTag>
get_reader_backend<String, FormatTag>::type
make_reader_backend(
    String const& file_name,
    image_read_settings<FormatTag> const& settings)
requires mp11::mp_and
        <
            detail::is_supported_path_spec<String>,
            is_format_tag<FormatTag>
        >::value;