[streambuf.virt.buffer]

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basic_streambuf* setbuf(char_type* s, streamsize n);

Effects: Influences stream buffering in a way that is defined separately for each class derived from basic_streambuf in this Clause ([stringbuf.virtuals], [filebuf.virtuals]).

Default behavior: Does nothing.

Returns this.

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pos_type seekoff(off_type off, ios_base::seekdir way,
                 ios_base::openmode which
                   = ios_base::in | ios_base::out);

Effects: Alters the stream positions within one or more of the controlled sequences in a way that is defined separately for each class derived from basic_streambuf in this Clause ([stringbuf.virtuals], [filebuf.virtuals]).

Default behavior: Returns pos_type(off_type(-1).

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pos_type seekpos(pos_type sp,
                 ios_base::openmode which
                   = ios_base::in | ios_base::out);

Default behavior: Returns pos_type(off_type(-1).

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int sync();

Effects: Synchronizes the controlled sequences with the arrays.

That is, if pbase() is non-null the characters between pbase() and pptr() are written to the controlled sequence.

The pointers may then be reset as appropriate.

Default behavior: Returns zero.

31 Input/output library [input.output]

31.6 Stream buffers [stream.buffers]

31.6.3 Class template basic_streambuf [streambuf]

31.6.3.5 Virtual functions [streambuf.virtuals]

31.6.3.5.2 Buffer management and positioning [streambuf.virt.buffer]