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(iostream-295.info)Stdiobuf

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Wrappers for C `stdio'
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   A "stdiobuf" is a `streambuf' object that points to a `FILE' object
(as defined by `stdio.h').  All `streambuf' operations on the
`stdiobuf' are forwarded to the `FILE'.  Thus the `stdiobuf' object
provides a wrapper around a `FILE', allowing use of `streambuf'
operations on a `FILE'.  This can be useful when mixing C code with C++
code.

   The pre-defined streams `cin', `cout', and `cerr' are normally
implemented as `stdiobuf' objects that point to respectively `stdin',
`stdout', and `stderr'.  This is convenient, but it does cost some
extra overhead.

   If you set things up to use the implementation of `stdio' provided
with this library, then `cin', `cout', and `cerr' will be set up to use
`stdiobuf' objects, since you get their benefits for free.  Note: C
Input and Output.