std::future::wait_until - cppreference.com
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      std::future::wait_until

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      Getting the result
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      <tbody> </tbody>
      template< class Clock, class Duration > std::future_status wait_until( const std::chrono::time_point<Clock,Duration>& timeout_time );
      Aguarda o resultado se torne disponível. Blocos até timeout_time especificado foi alcançado ou o resultado se torna disponível, o que ocorrer primeiro. Valor retorna identifica o estado do resultado. Podem bloquear por mais de até timeout_time foi atingido.
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      Waits for the result to become available. Blocks until specified timeout_time has been reached or the result becomes available, whichever comes first. Returns value identifies the state of the result. May block for longer than until timeout_time has been reached.
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      Parâmetros

      timeout_time -
      ponto de tempo máximo para bloquear até
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      maximum time point to block until
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      Valor de retorno

      Constant Explanation
      future_status::deferred The function to calculate the result has not been started yet
      future_status::ready The result is ready
      future_status::timeout The timeout has expired

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