[libstdc++] Document and guard stdio_filebuf.h

[Mark Mitchell]

--On Tuesday, May 21, 2002 04:59:10 PM -0400 Phil Edwards <phil@jaj.com> 
wrote:

> This adds doxygen markup to the stdio_filebuf extension class.
>
> It also adds multiple inclusion guards.  Since those are not
> documentation, I'm formally requesting branch approval under rule #2.a
> from
>
>     http://gcc.gnu.org/ml/gcc/2002-05/msg01212.html

Are there ways to get errors by trying to #include this file more than
once at present?

--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com