The value of template type like std::false_type

Question

If std::false_type is a type, what is the valid value for this type? If I just want to implement a function like below whose return type is std::false_type, how could I achieve this?

typename std::false_type operator()(){
   return declval<std::false_type>();
}

Answer 1

Try return std::false_type{}; or return {}; as suggested in the comment.