libstdc++/1704: Null output from Josuttis example

[pcarlini@unitus.it]

>Number:         1704
>Category:       libstdc++
>Synopsis:       Null output from Josuttis example
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jan 19 12:56:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Paolo Carlini
>Release:        gcc version 2.97 20010119 (experimental) or any snapshot in the last weeks
>Organization:
>Environment:
Intel PII, GLIBC2.2.1
>Description:
The following code (by N. Josuttis, p.669- of his book) does not produce the expected output (i.e. 31 HEXADECIMAL: 1F):


#include <iostream>
#include <streambuf>
#include <locale>
#include <cstdio>

class outbuf : public std::streambuf
{
  protected:
    /* central output function
     * - print characters in uppercase mode
     */
    virtual int_type overflow (int_type c) {
        if (c != EOF) {
            // convert lowercase to uppercase
            c = std::toupper(c,getloc());

            // and write the character to the standard output
            if (std::putchar(c) == EOF) {
                return EOF;
            }
        }
        return c;
    }
};

int main()
{
    outbuf ob;                // create special output buffer
    std::ostream out(&ob);    // initialize output stream with that output buffer

    out << "31 hexadecimal: " << std::hex << 31 << std::endl;
}
>How-To-Repeat:
The next example in the book too (outbuf1x.cpp & outbuf1x.hpp) does not produce the expected output

P.S.: Thanks to Benjamin Kosnik for having fixed the bug I previously reported!
		
>Fix:
Dunno, unfortunately...
>Release-Note:
>Audit-Trail:
>Unformatted: