using | ML::experimental::fil::detail::specialization_variant = std::variant< specialization_types< tree_layout::depth_first, false, false >, specialization_types< tree_layout::depth_first, false, true >, specialization_types< tree_layout::depth_first, true, false >, specialization_types< tree_layout::depth_first, true, true >, specialization_types< tree_layout::breadth_first, false, false >, specialization_types< tree_layout::breadth_first, false, true >, specialization_types< tree_layout::breadth_first, true, false >, specialization_types< tree_layout::breadth_first, true, true > > |