Unbuffered FormatterToXML behavior

[Brian Quinlan]

I'm trying to use an unbuffered FormatterToXML object and I'm
encountering an assertion in flushChars because m_charBuf.size() == 0.
I think that this can easily be fixed by changing
FormatterToXML.flushFunction to NULL if the output is not buffered and
changing FormatterToXML::endDocument() as follows:

void
FormatterToXML::endDocument()
{
-       assert(m_flushFunction != 0);

        if(m_doIndent == true && m_isprevtext == false)
        {
                outputLineSep();
        }
+       if (m_flushFunction != 0)
-       (this->*m_flushFunction)()
                (this->*m_flushFunction)();

        flushWriter();
}

Let me know if this is a known problem and if my fix is reasonable.
Right now, I guess that it is not possible to do unbuffered XML
output.

Cheers,
Brian