Question on library issue #581, using a sentry in flush()

This would have gone to comp.std.c++, had it been active.


The resolution to issue 581

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2578.html#581

requires that basic_ostream::flush creates a sentry object to verify
the stream state.

However, for streams with the unit_buf flag set, like std::err, the
destructor of the sentry object will again call flush(). This seems to
create an infinite recursion for

std::cerr << std::flush;

or even

std::cerr << "Some message"  << std::endl;


Have I missed something here?


Bo Persson



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