#include <annex/data/variant/variant.hpp>

template<int I>
struct dummy {
    operator int() const { return -1; }
};

template<int N>
int expand()
{
    return []<std::size_t... Indices>(std::index_sequence<Indices...>) -> auto
    {
        using annex::variant;
        variant<dummy<Indices>..., int> v = 7;
        variant<dummy<Indices>..., int> w = 8;
        variant<dummy<Indices>..., int> z = 5;
        auto compute = [](auto i, auto j, auto k) { return (i + j) * k; };
        return apply(compute, v, w, z);
    }(std::make_index_sequence<N> {});
}

int main()
{
    return expand<40>();
}