protected: int sync() override;
First, records that a flush is pending, by updating the appropriate private flag.
Then, if the current emit-on-sync policy is
true, makes a call to
Otherwise (if the emit-on-sync policy is
false, which is the default), the flush is suspended until
emit() is called, such as through
sync() or its equivalent is implicitly called by
seekpos() and explicitly called by
| synchronizes the buffers with the associated character sequence
(virtual protected member function of
| calls emit on the underlying basic_syncbuf to transmit its internal data to the final destination
(public member function of
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