# std::experimental::shared_future

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< cpp‎ | experimental

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

The class template `std::experimental::shared_future` extends std::shared_future with the following operations:

- an unwrapping constructor from `future<shared_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.

There is no interoperation between `std::experimental::shared_future` and std::shared_future.

### Member functions

(constructor) | constructs a `shared_future` (public member function)
is_ready | checks if the shared state is ready (public member function)
then | attaches a continuation to a `shared_future` (public member function)
operator= | assigns the contents (public member function)

## Members identical to std::shared_future

### Member functions

(destructor) | destructs the future object (public member function of `std::shared_future`)

##### Getting the result

get | returns the result (public member function of `std::shared_future`)

##### State

valid | checks if the future has a shared state (public member function of `std::shared_future`)
wait | waits for the result to become available (public member function of `std::shared_future`)
wait_for | waits for the result, returns if it is not available for the specified timeout duration (public member function of `std::shared_future`)
wait_until | waits for the result, returns if it is not available until specified time point has been reached (public member function of `std::shared_future`)

### Example

| This section is incomplete Reason: no example

### See also

future (concurrency TS) | A version of std::future enhanced with continuations and other features (class template)

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