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(iostream-295.info)Synchronization

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Synchronizing related streams
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   You can use these methods to synchronize related streams with one
another:

 - Method: ostream* ios::tie () const
     Report on what output stream, if any, is to be flushed before
     accessing this one.  A pointer value of `0' means no stream is
     tied.

 - Method: ostream* ios::tie (ostream* ASSOC)
     Declare that output stream ASSOC must be flushed before accessing
     this stream.

 - Method: int ios::sync_with_stdio ([int SWITCH])
     Unless iostreams and C `stdio' are designed to work together, you
     may have to choose between efficient C++ streams output and output
     compatible with C `stdio'.  Use `ios::sync_with_stdio()' to select
     C compatibility.

     The argument SWITCH is a GNU extension; use `0' as the argument to
     choose output that is not necessarily compatible with C `stdio'.
     The default value for SWITCH is `1'.

     If you install the `stdio' implementation that comes with GNU
     `libio', there are compatible input/output facilities for both C
     and C++.  In that situation, this method is unnecessary--but you
     may still want to write programs that call it, for portability.