The class template std::future provides a mechanism to access the result of asynchronous operations: The get member function waits (by calling wait ()) until the shared state is ready, then retrieves the value stored in the shared state (if. Checks if the future refers to a shared state.
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Unlike std::future, which is only moveable (so only one instance can refer to any particular asynchronous result), std::shared_future. } above, somelongcomputation will immediately return a.
