Asias He 5e6f84cba8 streaming: Implement stream_result_future::handle_session_prepared ...

Instead of playing the game of casting between stream_event and derived
class. We overload handle_stream_event with derived stream_event class.

virtual void handle_stream_event(session_complete_event event) {}
virtual void handle_stream_event(progress_event event) {}
virtual void handle_stream_event(session_prepared_event event) {}

Also, make the virtual function non pure virtual, so user can override
the interested event only without defining all of the three.

2015-07-21 16:12:54 +08:00

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