从hana::tuple_t到hana::tuple

Question

我有一个hana::tuple_t<int, char, double, float>，我想用它来创建一个hana::tuple<int, char, double, float>。

我认为使用hana::to<hana::tuple_tag>可以将hana::tuple_t<int, char, double, float>转换为hana::tuple<int, char, double, float>；但事实并非如此，因为以下代码总是失败：

auto oType = hana::tuple_t<int, char, double, float>;

BOOST_HANA_CONSTANT_ASSERT(
    hana::to<hana::tuple_tag>(oType)
    ==
    hana::make_tuple(1, 'C', 1.0, 1.0f)
);

我也尝试过使用hana::transform，但没有成功(尽管我怀疑我做错了)：

auto vecs = hana::transform(typeList, [](auto t) {
    return typename decltype(t)::type{};
});

那么，如何将hana::tuple_t转换为hana::tuple呢？