<streambuf>
The <streambuf>
header declares the basic_streambuf class template and its two
specializations: streambuf and
wstreambuf. A stream buffer object
manages low-level access to a sequence of characters. The characters
might be stored in an external file or reside entirely in memory. See
the <fstream>, <sstream>, and <strstream> headers for examples of
different kinds of stream buffers that are derived from basic_streambuf.
Most programs do not use stream buffers directly, but use stream classes instead because they provide a higher-level interface. Each stream object has an associated stream buffer object.
See Chapter 9 for general information on input and output using the stream classes.
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