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io_context::poll_one (2 of 2 overloads)

(Deprecated: Use non-error_code overload.) Run the io_context object's event processing loop to execute one ready handler.

count_type poll_one(
    boost::system::error_code & ec);

The poll_one() function runs at most one handler that is ready to run, without blocking.



Set to indicate what error occurred, if any.

Return Value

The number of handlers that were executed.