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Using the `streambuf' Layer
***************************

   The `istream' and `ostream' classes are meant to handle conversion
between objects in your program and their textual representation.

   By contrast, the underlying `streambuf' class is for transferring
raw bytes between your program, and input sources or output sinks.
Different `streambuf' subclasses connect to different kinds of sources
and sinks.

   The GNU implementation of `streambuf' is still evolving; we describe
only some of the highlights.

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Areas
Areas in a streambuf.
Overflow
Simple output re-direction
Formatting
C-style formatting for streambuf objects.
Stdiobuf
Wrappers for C stdio.
Procbuf
Reading/writing from/to a pipe
Backing Up
Marking and returning to a position.
Indirectbuf
Forwarding I/O activity.