struct JxlEncoderStruct
{ ... };
template <class WriteBox>
auto AppendBox(const jxl::BoxType& type, bool unbounded, size_t box_max_size, const WriteBox& write_box) -> Status
template <class BoxContents>
auto AppendBoxWithContents(const jxl::BoxType& type, const BoxContents& contents) -> Status
auto MustUseContainer() const -> bool