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Glib::RefPtr<SocketAddress> next(const Glib::RefPtr<Cancellable>& cancellable);
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* If this enumerator is expected to yield addresses, but for some reason is unable to (eg, because of a DNS error),
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* then the first call to next() will throw an exception. However, if the first call to next() succeeds, then any further internal errors
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Glib::RefPtr<SocketAddress> next();
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/** Asynchronously retrieves the next SocketAddress from the enumerator and then calls @a slot,