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(Deprecated: Use non-error_code overload.) Run the io_context
object's event processing loop to execute ready handlers.
count_type poll(
asio::error_code & ec);
The poll() function runs handlers that are ready to run,
without blocking, until the io_context
has been stopped or there are no more ready handlers.
Set to indicate what error occurred, if any.
The number of handlers that were executed.