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[syncstream.syncbuf.virtuals]

31 Input/output library [input.output]

31.11 Synchronized output streams [syncstream]

31.11.2 Class template basic_syncbuf [syncstream.syncbuf]

31.11.2.5 Overridden virtual functions [syncstream.syncbuf.virtuals]

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int sync() override;

1

Effects: Records that the wrapped stream buffer is to be flushed.

Then, if emit-on-sync is true, calls emit().

[Note 1: 

If emit-on-sync is false, the actual flush is delayed until a call to emit().

— end note]

2

Returns: If emit() was called and returned false, returns -1; otherwise 0.