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          Certain topics in C++ can arouse strong passions, and exceptions are no
          exception. We cannot resist mentioning — for purely informational purposes
          — that when you need only the first result from some
          number of concurrently-running fibers, it would be possible to pass a
          shared_ptr< to the
          participating fibers, then cause the initiating fiber to call promise<>>future::get() on
          its future<>. The first fiber to call promise::set_value() on
          that shared promise will
          succeed; subsequent set_value() calls on the same promise
          instance will throw future_error.
        
Use this information at your own discretion. Beware the dark side.