The return value of basic_filebuf::setbuf is not defined in section 27.8.1.4
[lib.filebuf.virtuals]. Contrast this with basic_stringbuf::setbuf
(27.7.1.3), where the return value is always "this", even if the behavior
is implementation defined.
--
Ray Lischner, author of C++ in a Nutshell (forthcoming)
http://www.tempest-sw.com/cpp/

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