virtual int sync()
If a put area exists (e.g. the file was opened for writing), calls overflow() to write all pending output to the file.
If a get area exists (e.g. the file was opened for reading), the effect is implementation-defined. Typical implementation may empty out the get area and move the current file position back by the corresponding number of bytes.
0 in case of success, -1 in case of failure.
sync() or its equivalent is implicitly called by close(), seekoff(), and seekpos() and explicitly called by std::basic_streambuf::pubsync()
|This section is incomplete|
Reason: no example
| invokes sync() |
(public member function of
| synchronizes an output stream with the actual file |