Unpacking Parameter Pack in C++

I have two functions f and g. f calculates it's return value asynchronously and returns a future. Now, based on several return values of f, I want to call g, but I want to make sure that the computations of the values of f happen in parallel.

Consider the following code:

template <typename T>
std::future<T> f(T& t);

template <typename... T>
void g(T&&... t)

template <typename... T>
void call_wrapper(T&&... t) {
  auto f1 = f(t1); // How do I set the values of f1... fn
  auto f2 = f(t2);
  ...
  g(f1.get(), f2.get()....); // How do I call g
}

How can I unpack the types from the variadic template T of the call_wrapper function?