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Determine whether the
io_context
object has been stopped.
bool stopped() const;
This function is used to determine whether an io_context object has been stopped,
either through an explicit call to stop(), or due to running out of work. When
an io_context
object is stopped, calls to run(), run_one(), poll() or poll_one() will return immediately without invoking
any handlers.
true if the io_context object is stopped,
otherwise false.