constexpr auto res = value_list<1,2,3,4,5,6,7,8,9,10>
                   | transform([](auto x) { return x * x; })
                   | filter([](auto x) { return x < 30; })
                   | fold_left(0, [](auto acc, auto n) { return acc + n; })
                   ;
static_assert(res == 55);

constexpr auto result = type_list<int, char, long, char, short, float, double>
                      | filter([]<typename T>(TypeConst<T>) { return sizeof(T) < 4; })
                      | transform([]<typename T>(TypeConst<T>) { return _t<std::add_pointer_t<T>>; })
                      | unique()
                      | convert_to<std::variant>()
                      ;
static_assert(result == _t<std::variant<char*, short*>>);