template<typename T>
struct lambda_tuple
{
    bool deleted = false;
    bool paused  = false;
    lambda_tuple() {}
    lambda_tuple(const T &f) : functor(f) {}
    template<typename ... A>
    typename std::result_of<T(A...)>::type operator()(A && ... args) {return functor(args ...);}
private:
    T functor {};
};