# std::basic_filebuf<CharT,Traits>::sync

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< cpp‎ | io‎ | basic filebuf

protected: 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, then flushes the file as if by calling std::fflush.

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.

### Parameters

(none)

### Return value

​0​ in case of success, -1 in case of failure.

### Notes

`sync()` or its equivalent is implicitly called for output streams by `close()`, `seekoff()`, and `seekpos()` and explicitly called by std::basic_streambuf::pubsync()

### Example

| This section is incomplete Reason: no example

### See also

pubsync | invokes sync() (public member function of `std::basic_streambuf<CharT,Traits>`)
fflush | synchronizes an output stream with the actual file (function)

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