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Run the io_context object's
event processing loop for a specified duration to execute at most one handler.
template<
typename Rep,
typename Period>
std::size_t run_one_for(
const chrono::duration< Rep, Period > & rel_time);
The run_one_for() function blocks until one handler has been
dispatched, until the io_context
has been stopped, or until the specified duration has elapsed.
The duration for which the call may block.
The number of handlers that were executed.