static constexpr auto apply(Xs&& xs, N const&) {
constexpr std::size_t n = hana::value<N>();
constexpr std::size_t len = hana::value<decltype(hana::length(xs))>();
return remove_at_helper(static_cast<Xs&&>(xs),
std::make_index_sequence<n>{},
std::make_index_sequence<len - n - 1>{});
}
static constexpr auto apply(Xs&& xs, N const&) {
constexpr std::size_t n = N::value;
constexpr std::size_t len = decltype(hana::length(xs))::value;
static_assert(n < len,
"hana::remove_at(xs, n) requires 'n' to be in the bounds of the sequence");
return remove_at_helper(static_cast<Xs&&>(xs),
std::make_index_sequence<n>{},
std::make_index_sequence<len - n - 1>{});
}