std::experimental::future

Defined in header `<experimental/future>`
template< class T > class future;	(1)	(concurrency TS)
template< class T > class future<T&>;	(2)	(concurrency TS)
template<> class future<void>;	(3)	(concurrency TS)

The class template std::experimental::future extends std::future with the following operations:

an unwrapping constructor from future<future<T>>;
a member function is_ready to query whether the associated shared state is ready; and
a member function then to attach a continuation to the future.

However, there is no interoperation between std::experimental::future and std::future.

(constructor)	construct a `future` object (public member function)
is_ready	checks if the shared state is ready (public member function)
then	attaches a continuation to a future (public member function)
operator=	moves the future object (public member function)

Members identical to std::future

Note that share() returns a std::experimental::shared_future<T>. The behavior is otherwise identical.

(destructor)	destructs the future object (public member function of `std::future<T>`)
share	transfers the shared state from `*this` to a `shared_future` and returns it (public member function of `std::future<T>`)
Getting the result
get	returns the result (public member function of `std::future<T>`)
State
valid	checks if the future has a shared state (public member function of `std::future<T>`)
wait	waits for the result to become available (public member function of `std::future<T>`)
wait_for	waits for the result, returns if it is not available for the specified timeout duration (public member function of `std::future<T>`)
wait_until	waits for the result, returns if it is not available until specified time point has been reached (public member function of `std::future<T>`)

This section is incomplete
Reason: no example