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Showing content from https://cplusplus.com/reference/future/future_status/ below:

enum class

<future>

std::future_status 
enum class future_status;

Return value for timed future operations

This enum class type defines the possible return values of the wait_for and wait_until member functions of future and shared_future. future_status label int value description future_status::ready 0 The function returned because the shared state was ready. future_status::timeout 1 The function returned because the specified time was exhausted. future_status::deferred 2 The function returned because the shared state contains a deferred function (see std::async).
See also
future::wait_for
Wait for ready during time span (public member function)
future::wait_until
Wait for ready until time point (public member function)
shared_future::wait_for
Wait for ready during time span (public member function)
shared_future::wait_until
Wait for ready until time point (public member function)

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