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Unbuffered basic_streambuf

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I was hoping that someone (after my own failures) might post a very mininal
unbuffered derivation of basic_streambuf. My problem is that (even leaving
the buffer pointers to their defaults) uflow() never gets called unless I
define an underflow(). overflow() works as expected but I'm just trying to
start small and I can't even get that done.

I have also tried setting the buffer pointers using the _Init() method,
setp( 0, 0 ), setg( 0, 0, 0 ) and it still "seems" to treat my derivation as
a buffered stream.



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