std::shared_future<T>::wait_until
wait_until waits for a result to become available. It blocks until specified timeout_time has been reached or the result becomes available, whichever comes first. The return value indicates why wait_until returned.
# Declarations
template< class Clock, class Duration >
std::future_status wait_until( const std::chrono::time_point<Clock,Duration>& timeout_time ) const;
(since C++11)
# Parameters
timeout_time: maximum time point to block until
# Notes
The implementations are encouraged to detect the case when valid() == false before the call and throw a std::future_error with an error condition of future_errc::no_state.
The standard recommends that the clock tied to timeout_time be used to measure time; that clock is not required to be a monotonic clock. There are no guarantees regarding the behavior of this function if the clock is adjusted discontinuously, but the existing implementations convert timeout_time from Clock to std::chrono::system_clock and delegate to POSIX pthread_cond_timedwait so that the wait honors adjustments to the system clock, but not to the user-provided Clock. In any case, the function also may wait for longer than until after timeout_time has been reached due to scheduling or resource contention delays.
# Example
This section is incompleteReason: no example