Method implicit_cast

include/pybind11/cast.h:798–800

protected:
    template <size_t... Is>
    type implicit_cast(index_sequence<Is...>) & {
        return type(cast_op<Ts>(std::get<Is>(subcasters))...);
    }
    template <size_t... Is>
    type implicit_cast(index_sequence<Is...>) && {
        return type(cast_op<Ts>(std::move(std::get<Is>(subcasters)))...);